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Intra-Cellular Therapies Inc (NASDAQ:ITCI)
Q1 2021 Earnings Call
May 10, 2021, 8:30 a.m. ET

Contents:

  • Prepared Remarks
  • Questions and Answers
  • Call Participants

Prepared Remarks:

Operator

Good morning, ladies and gentlemen, and welcome to Intra-Cellular Therapies First Quarter 2021 Financial Results Conference Call. As a reminder, today's conference call is being recorded.

I'd now like to turn the conference over to Dr. Juan Sanchez, Vice President, Corporate Communications and Investor Relations. Please go ahead.

Juan Sanchez -- Vice President of Corporate Communications and Investor Relations

Good morning and thank you all for joining us for today's conference call. Our earnings press release provides a corporate update and details of the company's financial results for the first quarter ended March 31, 2021. This press release crossed the wire a short time ago and is available on our website at intracellulartherapies.com.

Joining me on the call today are Dr. Sharon Mates, Chairman and Chief Executive Officer; Mark Neumann, Executive Vice President and Chief Commercial Officer; Dr. Suresh Durgam, Senior Vice President and Chief Medical Officer; and Larry Hineline, Senior Vice President and Chief Financial Officer.

As a reminder, during today's call, we will be making certain forward-looking statements. These statements may include statements regarding, among other things, the efficacy, safety, and intended use of the company's product development candidates, our clinical and non-clinical plans, our plans to present or report additional data, the anticipated conduct and results of ongoing and future clinical trials, plans regarding regulatory filings, future research and development, our plans and expectations regarding the commercialization of CAPLYTA, potential impact of the COVID-19 pandemic on our business, and possible uses of existing cash and investment resources.

These forward-looking statements are based on current information, assumptions and expectations that are subject to change and involve a number of risks and uncertainties that may cause actual results to differ materially from those contained in the forward-looking statements. These and other risks are described in our periodic filings made with the Securities and Exchange Commission, including our quarterly and annual reports. You're cautioned not to place undue reliance on these forward-looking statements and the company disclaims any obligations to update such statements.

I will now turn the call over to Sharon.

Sharon Mates -- Founder, Chairman and Chief Executive Officer

Thanks, Juan. It's a pleasure to be here. And welcome to today's call, everyone. We are very excited to share our progress during the first quarter of this year. First and foremost, last week, we announced the acceptance by the FDA of our supplemental new drug applications for lumateperone for the treatment of bipolar depression with a PDUFA action date of December 17 of this year. This marks an important milestone toward offering this important medicine for a broad group of patients living with bipolar depression; a complex and highly prevalent chronic condition with significant unmet medical needs. As many of you heard from our KOL call last week, lumateperone, given its efficacy and safety profile, if approved, will be a promising new medicine for these patients. We are very excited about this opportunity and our commercial team is actively preparing to launch immediately upon approval.

I will now provide additional highlights of the first quarter, starting with our commercial progress. Total revenues grew to $15.9 million in Q1 2021. We are pleased with CAPLYTAs quarter-over-quarter prescription growth of 23% despite challenging market conditions due to COVID continuing. CAPLYTAs net product revenues for the first quarter were $15.6 million versus $12.4 million in Q4 2020, and $0.9 million in Q1 2020. Larry Hineline and Mark Neumann will provide further details shortly.

I'd like now to summarize our pipeline progress. I'll begin with our late-stage programs. We recently made several presentations at the American Psychiatric Association Annual Meeting. These presentations were discussed last week during our webcast with Dr. Roger McIntyre, professor of psychiatry and pharmacology at the University of Toronto. Dr. McIntyre provided an overview of the mood disorder spectrum. He described the complexity of bipolar disorder and the severity of bipolar depression, which represents the most common and debilitating manifestation of this disease. He underscored the unmet medical needs in bipolar depression and major depressive disorder or MDD and discussed how lumateperone may be an important option for these broad patient populations, given its efficacy and favorable safety profile. In addition, he provided highlights of our poster presentations, which included results from our two Phase 3 studies, Study 402 and Study 404, which form the basis of our sNDAs for the treatment of bipolar depression.

The efficacy of lumateperone has been demonstrated in two positive Phase 3 clinical trials, one evaluating lumateperone as monotherapy and the second one as an adjunctive therapy with lithium or valproate. The benefit of lumateperone as a treatment for a broad patient population suffering from bipolar depression is further enhanced by its favorable safety and tolerability profile. Rates of akathisia, restlessness, extrapyramidal symptoms and changes in weight and metabolic parameters in our bipolar studies were similar to placebo and consistent with the safety profile demonstrated in all other lumateperone studies.

Expanding on this strong data, we have ongoing programs in other depressive disorders, including adjunctive treatment of major depressive disorder and treatment of depression in patients with bipolar depression or major depressive disorder exhibiting mixed features. There is a significant need for effective, safe and well-tolerated medicines for these highly prevalent psychiatric disorders. We expect clinical conduct in our MDD adjunctive studies to begin later this year and clinical conduct in our Mixed Features program is ongoing and we expect top line results in the second half of 2022. Our Phase 1 safety and pharmacokinetic study with a long-acting formulation of lumateperone for the treatment of schizophrenia is ongoing. We anticipate initial results from this study in the second half of 2021.

I also want to call your attention to some of our other pipeline programs. First, I'd like to highlight the important progress that we've made in our PDE1 inhibitor platform. As you have heard us discuss on previous calls, this platform is focused on diseases in which the PDE1 enzyme is over-expressed with a focus on diseases, where there is also abnormal immune cell function that contributes to a diseases pathology. This focus provides multiple therapeutic opportunities for our PDE1 inhibitors across a variety of diseases, including Parkinson's disease, heart failure and certain cancers.

As previously reported, the benefits of PDE1 inhibition in Parkinson's disease were demonstrated in a proof of concept Phase 1/2a study, Study ITI-214-105. In this study, our lead PDE1 inhibitor lenrispodun, formerly ITI-214, was shown to improve motor function, reduce dyskinesia and lower biomarkers associated with inflammation when added to optimize therapies for Parkinson's patients. We have published pre-clinical data showing that anti-inflammatory effects of PDE1 inhibitors in the brain are mediated by controlling microglia, brain resident macrophage-like cells. This may be important for altering disease progression in Parkinson's disease.

Based on these findings, lenrispodun is advancing into a Phase 2 clinical study in Parkinson's disease in the second half of this year. Our goal for the Parkinson's program is to study the drug's ability to improve motor symptoms without causing troublesome dyskinesia, improve cognition and preserve and restore neuronal function, which may lead to disease modification.

We recently shared with you pre-clinical data we presented at the American Association for Cancer Research on the potential anti-tumor effects of PDE1 inhibitors. We presented pre-clinical data supporting the potential of PDE1 inhibition to enhance the anti-tumor effects of other immunotherapies by altering the tumor micro-environment. We hypothesized that PDE1 inhibition would act by a similar mechanism in tumors in the periphery as they do in the brain to control aberrant immune cell function.

Our pre-clinical data presented at AACR showed that when our PDE1 inhibitors and anti-PD1 checkpoint inhibitor are combined, tumor volumes were significantly reduced and tumor-free survival was significantly increased in a mouse model of Colon Carcinoma. Our PDE1 inhibitors could represent a novel and broadly applicable approach to the treatment of immune responsive cancers.

We are also advancing a new molecular entity called ITI-1284 ODT-SL, a deuterated form of lumateperone delivered sublingually as an orally disintegrating tablet. This is the result of our efforts to evaluate different molecules and formulations for different patient populations with neuropsychiatric disorders. Our Phase 1 program showed ITI-1284 ODT-SL was rapidly absorbed into the systemic circulation, was metabolically stable and resulted in high systemic exposure, making it suitable for study in the elderly population.

We plan to evaluate ITI-1284 ODT-SL in the treatment of behavioral disturbances in patients with dementia, dementia-related psychosis, as well as in certain depressive disorders in the elderly. These are conditions with large unmet medical needs and there are few effective treatments. We are presently planning these studies and expect to begin these studies later this year and in 2022. We will provide further information about our plans as the year progresses.

We continue to develop ITI triple 3 or ITI-333, our novel oral modulator of serotonin and mu opioid receptors for the treatment of opioid use disorder. A Phase 1 single ascending dose study evaluating the safety, tolerability and pharmacokinetics of ITI-333 in healthy volunteers is ongoing and we anticipate data from this study in the second half of this year.

Our expanding portfolio, including the recent additions of ITI-1284 and ITI-333 demonstrates the strength of our company's pipeline and our continued long-term commitment to developing innovative therapeutics for central nervous system disorders.

I will now turn the call over to Mark. Following his remarks, Larry will provide details on our financial performance.

Mark Neumann -- Executive Vice President, Chief Commercial Officer

Thanks, Sharon and good morning, everyone. It's a pleasure to be here today with all of you. We made steady progress with the launch of CAPLYTA for schizophrenia during the first quarter of the year, registering a 23% increase in total prescriptions versus the fourth quarter of 2020. This performance came at a time of intensified COVID impact during the winter months that limited psychiatry patient visits overall and increased the proportion of visits conducted through telepsychiatry.

Psychiatrists have generally been more conservative in their treatment approach in a telepsychiatry setting versus an in-person visit, thereby reducing the frequency of treatment changes, including switches from other anti-psychotics. This has been particularly true for patients with more complex conditions like schizophrenia.

In-person sales representative access to physicians also continued to be impacted during the quarter as clinics and offices maintained visitation restrictions for industry representatives. More recently, we've seen incremental improvements in market conditions and remain optimistic that this should continue with more favorable dynamics emerging in the second half of the year, including increases in schizophrenia patient visits and greater physician access for our sales force efforts.

We continue to successfully execute our hybrid commercialization model of combined in-person and virtual engagements and drove significant prescription growth during a time when the overall anti-psychotic market declined slightly. Importantly, CAPLYTA has been very well received in the market by our target physicians. We are very pleased with what we are hearing from doctors and seeing in our market research surveys regarding the use of CAPLYTA for the treatment of schizophrenia.

Psychiatrists highly rate the performance of CAPLYTAs efficacy and also point to CAPLYTAs favorable weight, EPS and metabolic profile. They also appreciate the lack of titration and convenient single 42 milligram dose. CAPLYTAs market access position continues to be strong with coverage standing at more than 95% of covered lives in both Medicare Part D and State Medicaid. These are the major payer channels in schizophrenia, representing approximately 70% to 85% of all prescriptions for the treatment of schizophrenia.

Additionally, our LytaLink patient support program continues to be highly effective in assisting prescribing physicians and eligible patients to gain access to CAPLYTA. So, in summary, we continue to be pleased with the commercial launch execution and performance of CAPLYTA in the market for the treatment of schizophrenia.

I'd like to now transition to our preparations for the potential approval of CAPLYTA for the treatment of bipolar depression later this year. As a commercial organization, we are extremely excited about this potential label expansion as it represents a significantly larger opportunity compared to schizophrenia. There are about 11 million adults in the U.S. who are living with bipolar I or bipolar II disorder and these patients have few approved treatment options for the depressive episodes associated with the disorder. These depressive episodes last longer and recur more often than manic and hypomanic episodes and they can be severely debilitating, highlighting the urgent need for new therapies.

Lumateperone has the potential to be approved across the broadest range of patients with bipolar depression with indications encompassing both bipolar I and bipolar II and for both monotherapy and as an adjunctive treatment to lithium or valproate. We've conducted extensive market research on bipolar depression and believe that lumateperone's clinical profile will be highly competitive for the treatment of this disorder. Psychiatrists cites efficacy and safety, particularly lack of weight gain and motor and metabolic disturbances, as key drivers for their treatment selection for their bipolar depressed patients. Given these treatment dynamics, it is not surprising that psychiatrists reacted positively to lumateperone's efficacy in a broad patient population and safety profile in our market research.

We know healthcare providers believe the distinction between bipolar 1 and bipolar II is clinically meaningful. Given, there is only one drug currently approved for use in bipolar II depression, we believe this will be a strong differentiator for lumateperone. We are well advanced in our commercialization planning and are confident that we will be ready to launch as soon as we receive FDA approval for the treatment of bipolar depression. Our market access team is actively working to engage payers on bipolar I and bipolar II and to increase the access to CAPLYTA in the commercial channel.

Our target prescriber panel will expand significantly from approximately 23,000 for schizophrenia to approximately 44,000 prescribers for the combined indications. There is a large overlap between schizophrenia and bipolar prescribers. So, we will be able to leverage our existing infrastructure, but we'll also incrementally add to our sales team prior to approval, so that it is appropriately sized to cover this large opportunity. Our sales team will be trained and we will be able to move quickly and reach a large prescriber base soon after launch. Again, we are proud of the continuous strong commercial execution of CAPLYTA and we are excited and ready to build on that success for additional indications to reach patients with bipolar depression.

With that, I will turn the call over to Larry. Larry?

Lawrence J. Hineline -- Senior Vice President of Finance & Chief Financial Officer

Thank you, Mark. I will review our financial results for the first quarter ending March 31, 2021. In the first quarter, we recorded total revenues of $15.9 million and net CAPLYTA revenues of $15.6 million. In the same period in 2020, we recorded $1.1 million of total revenues and $0.9 million in product revenues of CAPLYTA. Cost of product sales were $1.5 million in the first quarter of 2021 compared to $69,000 for the first quarter of 2020.

Research and development expenses for the first quarter of 2021 were $15.1 million compared to $16 million for the first quarter of 2020. This decrease is due primarily to a decrease in manufacturing expense and offset by an increase of lumateperone clinical and non-clinical expenses.

Selling, general and administrative expenses were $52.6 million for the first quarter of 2021 compared to $34.1 million for the same period in 2020. This increase is primarily due to an increase in sales-related labor costs and commercialization costs. Net loss for the first quarter of 2021 was $52.7 million compared to a net loss of $47.4 million for the quarter ended March 31, 2020.

Cash, cash equivalents, restricted cash and investment securities totaled $613.4 million at March 31, 2021 compared to $658.8 million at December 31, 2020.

This concludes our prepared remarks. Operator, could you please open the line for questions?

Questions and Answers:

Operator

[Operator Instructions] Our first question comes from Brian Abrahams with RBC Capital Markets.

Brian Abrahams -- RBC Capital Markets -- Analyst

Hey, guys. Thanks so much for taking my questions and congratulations on all the progress. I guess, maybe starting with the existing indications of schizophrenia, you mentioned that you're seeing some incremental improvements in market conditions. I was wondering if you could expand on that a little bit. I guess I'm curious to what degree are you seeing any very recent changes in the delivery of psychiatric care with the pandemic waning now. And I guess how much persistence do you expect telehealth to have as you're sort of thinking about navigating any longer term fundamental changes to the overall environment and sort of how you manage through physician behaviors and potential switching?

Sharon Mates -- Founder, Chairman and Chief Executive Officer

Hi, Brian. Thanks for the question, I'll ask Mark to address those, please.

Mark Neumann -- Executive Vice President, Chief Commercial Officer

Yeah, sure, Sharon. Hi, Brian. Good question. Yes, I would say the two main areas, when we say that we've seen incremental improvements in market conditions more recently, January and February were very challenging as cases of COVID rose. As we moved into March and then into April, caseloads began to come down, the country is starting to open back up and we are starting to see some improvements in the number of patient visits for schizophrenia patients coming back to their appointments. We are seeing our sales force incrementally be able to gain access in physician offices and in clinics, but we're still not back to pre-COVID levels in both of those. We think that -- we're optimistic that we're going to continue to see these incremental improvements for a while and then in the second half of the year, we think that's when we're going to see the greatest advances in market conditions.

The one area that has persisted has been the use of telepsychiatry. So, this is an area that psychiatrists adopted quickly and throughout the pandemic, they've been maintaining the percent of visits through telepsychiatry at about the same level, about 50% of the visits. We do expect, as conditions improve, that the degree to which telemedicine is used in psychiatry will begin to come down, but there will probably be some persistence that remains with telemedicine. Of course, it's difficult to know what's going to happen with COVID and difficult to know what's going to happen with reimbursement for telemedicine, but we would expect that, that would begin to come down back more toward baseline in the second half of the year.

Brian Abrahams -- RBC Capital Markets -- Analyst

Got it. That's really helpful. Thanks, Mark. And then on the deuterated lumateperone program, you talked a little bit about the PK profile there. Can you also talk about how maybe any differences there in the receptor profiles such as on D1 or mu might -- that have -- might be guiding your decision to move that into dementia-related behavioral disorders? And then maybe just quickly remind us on the IP for that. I'll hop back in the queue. Thanks.

Sharon Mates -- Founder, Chairman and Chief Executive Officer

Yeah. Thanks, Brian. I think 1284 is a receptor profile and the PK, we are going to present that data at a medical meeting. So, I think I'll leave it for right now. Suffice it to say that we believe that it is advantageous for the indications that we're pursuing. Just to remind you, we have said that 1284 quickly is absorbed and is present in the circulatory system and that we have good PK in the normal healthy volunteers and in the elderly population. I would not look it -- there isn't mu activity here. So, I think you're confusing that with ITI-333.

So -- and then you asked one more question -- oh, the IP. The IP is -- we certainly don't have the entire patent prosecution portfolio yet. But the patents that have issued go into 2040s.

Brian Abrahams -- RBC Capital Markets -- Analyst

Got it, that's super helpful. Thanks, Sharon.

Operator

Our next question comes from Jessica Fye with J.P. Morgan.

Jessica Fye -- J.P. Morgan -- Analyst

Hey, guys, good morning. Thanks so much for taking my questions. You said that you're working on increasing access for CAPLYTA in the commercial channel. What's your current commercial coverage and what's your goal for commercial coverage, either to get to before or shortly after the approval in bipolar depression? Also, what's the payer mix in bipolar depression?

Sharon Mates -- Founder, Chairman and Chief Executive Officer

Mark?

Mark Neumann -- Executive Vice President, Chief Commercial Officer

Yeah, sure, Sharon. Thanks, Jessica for the question. Yeah, I'll start with that -- your second part of your question first. The payer mix in bipolar depression is different than it is from schizophrenia as we've been communicating in the past. In schizophrenia, roughly 70% to 85% of all schizophrenia prescriptions flow through the government channels, either Medicaid or Medicare Part D. With bipolar depression being a different condition, you see a lot more of those prescriptions coming through the commercial channel. That doesn't mean that there aren't significant prescription levels coming through Medicaid and Medicare for bipolar depression, but we will see an increase in commercial.

As far as our access, our focus, because of that dynamic for schizophrenia, has really been to prioritize the Medicare Part D and State Medicaid channels where we have over 95% access to CAPLYTA in both of those channels. With commercial, it's in between 50% and 60% and we've made really good progress there and we'll be focusing during the course of this year, leading up to bipolar depression and shortly thereafter to get the commercial access up to the same levels that we currently have for Medicaid and Medicare as that becomes more important in bipolar depression.

Jessica Fye -- J.P. Morgan -- Analyst

Okay, great. And you also talked about expanding the sales team for the bipolar depression launch. Can you elaborate on that a little bit?

Mark Neumann -- Executive Vice President, Chief Commercial Officer

Yeah, sure. So, the prevalence of bipolar depression is much greater than it is for schizophrenia. So that means there are more patients and therefore more physicians who care for those patients. So, we expect to see an expansion of our target audience size from about 23,000 today with schizophrenia, about doubling to about 44,000 once we have the bipolar depression indication. Now, there is a good degree of overlap in the prescribers of schizophrenia. So, the good news is virtually all of the 23,000 prescribers that we currently target for schizophrenia also treat high levels of bipolar depression. So, we'll be able to leverage our existing footprint and our existing infrastructure to reach those physicians. But the additional 20,000 or so physicians who treat high levels of bipolar depression patients but don't treat schizophrenia, it's for those physicians that we'll be expanding our sales force prior to the approval.

We don't anticipate expanding the sales force by two times, which you might expect with a doubling of the size of the target audience, but it will be a significant expansion and we don't feel we'll need to double the size of the sales force because we do believe some of the changes in the commercialization model that we've seen during the pandemic where physicians like to receive their information and be educated in a mix of ways both in-person, which will continue, but also now even more to a greater extent virtually and through digital means, we think we'll be able to have a more efficient sales force with a greater number of targets. And therefore we won't have to double the size of the sales force, but there will be a significant expansion and we'll be highly competitive at those levels, with the existing companies that have products indicated for bipolar depression.

Jessica Fye -- J.P. Morgan -- Analyst

Okay, great. And maybe just the last one. Apologies if I missed this in prepared remarks. We think in the past, you've indicated a comfort with current consensus which if I look at Bloomberg right now looks just slightly over $100 million for CAPLYTA this year. Are you still comfortable with consensus estimates?

Sharon Mates -- Founder, Chairman and Chief Executive Officer

So I'll start on that and then I'll ask if Mark has anything to add to it, to do so. We believe we have a great product, a great team, and we're confident of CAPLYTAs commercial success and of our ability to execute and our execution. We are comfortable with current consensus for the year. Of course, it depends on the rate of COVID recovery and particularly as it relates to the return of schizophrenia patients to office visits. So, as Mark mentioned, some of the offices are opening up. The community mental health centers are seeing more patients. They're starting to allow people in and, of course, we are dependent upon the patient population we treat, schizophrenics, which is a fragile patient population and to their returning to doctor's offices. With that, we are comfortable with the current consensus for the year.

Jessica Fye -- J.P. Morgan -- Analyst

Got it. Thank you.

Operator

Our next question comes from Charles Duncan with Cantor Fitzgerald.

Charles C. Duncan -- Cantor Fitzgerald -- Analyst

Hi, Sharon and team. Thanks for taking the question and congrats on a good quarter progress. Wanted to ask you, first of all, Mark, quick question regarding kind of the survey work that you've done. In terms of the importance of lack of weight gain and extrapyramidal side effects etc., being more important for BPD I and II versus, say, schizophrenia in terms of prescriber decision making, I guess, I'm wondering, are you specifically asking those questions of current prescribers or of prescribers that have not yet prescribed CAPLYTA? And what is the awareness of CAPLYTA for -- in terms of its profile for those not-current prescribers?

Mark Neumann -- Executive Vice President, Chief Commercial Officer

Yeah. Thanks, Charles. Good question. So when we do our market research for new indications like bipolar depression, we go out to physicians who are high prescribers within that condition whether they are current prescribers of CAPLYTA or not. So our market research would include a mix of both of those types of prescribers and you're absolutely right, when we do that and we talk about what are the most important treatment drivers for them when considering what anti-psychotic to choose to treat a patient with bipolar depression, obviously, efficacy is very important to them. That's something that comes up right away, but very quickly, safety and tolerability, in particular, weight gain, but also metabolic disturbances, movement disorders, etc., are also very important in their treatment decisions.

And when in a market research setting, we then put the clinical data from lumateperone in front of them and ask them to rate the performance of CAPLYTA and their likelihood to prescribe for that patient type in the future, they rate the product very highly. They see the strong efficacy in the two clinical trials. They see the differentiated safety and tolerability profile. If they are familiar with CAPLYTA already, they see that the safety and tolerability in the bipolar depression trials was essentially replicated from what we saw in the schizophrenia trials and that all leads to a very high intent to prescribe in bipolar depression for these prescribers.

Charles C. Duncan -- Cantor Fitzgerald -- Analyst

That's helpful, Mark. And then, just sticking with prescriber dynamics, in the first quarter versus what you're seeing in the second quarter thus far, how do you feel about qualitatively about breadth versus depth in terms of prescribers within a practice versus broadening the number of prescribers?

Mark Neumann -- Executive Vice President, Chief Commercial Officer

Yeah, good question, Charles, and we continue to be pleased with what we're seeing in both breadth of prescribing, as well as depth of prescribing and we continue our marketing efforts against both of those dynamics. So we continue to add significantly new prescribers each week and the existing prescribers, we continue to see the depth increasing. So I'd characterize it as, at this stage of the launch, we feel very good about what we're seeing there and we're going to continue our efforts in both of those areas.

Charles C. Duncan -- Cantor Fitzgerald -- Analyst

Okay, last question for Sharon in terms of the pipeline. I'm really intrigued with the broadening pipeline, particularly one I'd ask you today about 214, although interest in the rest of the pipeline as well. But in terms of 214 or lenrispodun, I guess I'm wondering in terms of the PD indication, are you thinking about trying that first in early stage patients or in patients that are already on dopamine therapy? And given the mechanism, it would seem to me that there is potential use beyond PD. I'm wondering if you could provide some thoughts on that.

Sharon Mates -- Founder, Chairman and Chief Executive Officer

Sure. Thanks for the question, Charles. So in our Phase 1/2 study, these were patients who were on what they and their physicians believed were optimized treatments. So these are not very early stage patients because, of course, they are not on these meds yet when they're very early stage. So, I think that while we do believe that our PDE1 inhibitors may, in fact, have potential to be disease modifying, we are first testing them and helping patients with their motor disturbances and the dyskinesia's, which just to remind you, these dyskinesia's are caused by the medicines that they're taking. So, we also do believe if you remember back to our pre-clinical data, with our PDE1 inhibitors, we very effectively treated their cognitive deficits either early or late, either recall or retained. So, we believe that there is a potential for treating cognitive deficits as well in this patient population.

And lastly, as we've shown now both in brain with the ability to prevent neuroinflammation by preventing microglial activation in the brain and in the periphery by preventing the recruitment of macrophages to tumors, that we can have an effect on these populations of cells as well. So -- and we think all of that comes together in Parkinson's disease, in fact, the neuroinflammatory effects, the progression of disease, the cognitive deficits you see in this patient population and of course their motor deficits and their dyskinesia's.

Charles C. Duncan -- Cantor Fitzgerald -- Analyst

Okay, thank you. Thanks for taking my questions.

Operator

Our next question comes from Umer Raffat with Evercore ISI.

Bo Chen -- Evercore -- Analyst

Hi, this is Bo for Umer. Thank you for taking our questions. First, could you remind us what do you expect for the duration of therapy in schizophrenia and bipolar monotherapy and bipolar adjunct therapy? We understand that Dr. McIntyre, at the APA event, mentioned that Study 402 have very low dropout rate. If you could give us some color on that. Really appreciate it. And second is on your ex-U.S. commercial strategy. Are you waiting for the bipolar sNDA approval to consider ex-U.S. partnership or are you already in discussion? Thank you.

Sharon Mates -- Founder, Chairman and Chief Executive Officer

Thanks. I'm not sure I understand your question on duration of therapy. For this class of drugs, all studies are done as short-term studies. Both schizophrenia and bipolar depression patients remain on their drugs for very long periods of time if they're compliant and if they don't drop out due to side effects. So, if that doesn't answer your question then I would ask maybe you could rephrase it or say it again. And then I'm now forgetting your second question. Can you ask that one again, please, Bo?

Bo Chen -- Evercore -- Analyst

Yeah. Sure. The second question is on the ex-U.S. partnership.

Sharon Mates -- Founder, Chairman and Chief Executive Officer

Oh, right, sorry, yeah. Right. So, we will partner ex-U.S. I think we are first focused on our approval in the U.S. for bipolar depression. But you will see us partnering in other parts of the world.

Bo Chen -- Evercore -- Analyst

Thank you very much. And could you give us some color on the dropout rate in the Study 402?

Sharon Mates -- Founder, Chairman and Chief Executive Officer

I can't remember it off the top of my head, I don't know, Suresh, if you remember it or we can look it up and get back to you later in this call or after the call.

Bo Chen -- Evercore -- Analyst

Thank you very much.

Sharon Mates -- Founder, Chairman and Chief Executive Officer

But it was low. Yeah, OK.

Operator

Our next question comes from Marc Goodman with SVB Leerink.

Rudy Li -- SVB Leerink -- Analyst

Hey, thanks for taking my question. This is Rudy on the line for Marc. So I have two quick questions. First, can you provide some color on the gross-to-nets and inventory changes in the quarter? And secondly, regarding the long-acting injectable study, just curious what data should we expect from the ongoing study and what are the next steps to move into a pivotal trial? Thanks.

Sharon Mates -- Founder, Chairman and Chief Executive Officer

So I'll take the long-acting injectable question but I'll wait for Larry to tell you about the gross-to-nets first.

Lawrence J. Hineline -- Senior Vice President of Finance & Chief Financial Officer

Okay. Yeah, thank you. Thanks for the question. As you know, we've got several quarters of experience with gross-to-net for CAPLYTA and going forward for the balance of 2021, we expect our gross-to-net to be in the range of the mid-20s to the low-30s. Hopefully, that's helpful.

Rudy Li -- SVB Leerink -- Analyst

Yeah. That works. Thanks.

Sharon Mates -- Founder, Chairman and Chief Executive Officer

And then, I'll take the long-acting injectable question. So, right now we are in the single ascending dose study and what we hope to get to that is, of course, safety and tolerability, as well as the PK, meaning that we have a sustained PK value in the range that we're seeing for the oral therapy. Following this study, we would be doing a multiple ascending dose study. So, we expect the data on the single ascending dose study later this year. We would then begin the multiple ascending dose study followed by -- we have an agreement with the FDA for one efficacy study prior to application for approval.

Rudy Li -- SVB Leerink -- Analyst

Got it. That's very helpful. Thanks for the color.

Operator

Our next question comes from Andrew Tsai with Jefferies.

Andrew Tsai -- Jefferies -- Analyst

Hey, thanks, good morning and congrats on all the progress. So, my first question is just on the filing for bipolar depression. Did the FDA happen to mention anything perhaps in your day-74 letter about their thoughts on whether to post an AdCom or not? I understand the FDA can do whatever it wants, but would it be reasonable for investors to rule out that scenario?

Sharon Mates -- Founder, Chairman and Chief Executive Officer

Hi, Andrew. I think as we've seen over time, I would never rule out anything about anything when it comes to drug development and approval. Our day-74 letter did not address an AdCom.

Andrew Tsai -- Jefferies -- Analyst

Okay, thanks. And my second question is on the ongoing sales of CAPLYTA. I mean a competitor recently reported sales for their branded anti-psychotic that missed consensus by a good amount. So do you have any thoughts what is going on in the overall marketplace and why CAPLYTA seemingly isn't being affected as much as the other competing drugs? Thanks.

Sharon Mates -- Founder, Chairman and Chief Executive Officer

Mark, do you want to take that? And then I'll add, if need be.

Mark Neumann -- Executive Vice President, Chief Commercial Officer

Yeah, absolutely. And thanks Andrew for the question. Yeah, we have -- as I said in my proactive remarks, we have been very pleased with the steady progress that we're making, the 23% quarter-over-quarter total prescription growth came at a time of very challenging market conditions. When you look at the overall anti-psychotic market during that same time period that we grew 23%, that market actually declined slightly and the branded market declined even more than that. And as I think, you're well aware, there is some seasonality associated with that. But I think the majority of that was due to the challenging COVID conditions that we saw, especially in January and February when the caseload really rose to a very high level.

Now, we have seen recent incremental improvements in those market conditions. We are seeing higher level of patient visits. We are seeing some better access for sales representatives, but that's coming slowly during this quarter. We do think, as the country continues to open, that we'll see greater advancements in the second half of the year. But the first quarter was a challenging one from a COVID perspective and I think that's what you're seeing reflected in the overall prescription market for the anti-psychotics.

So, we were pleased. We think we executed well in this environment. We think we have a great product and the product continues to be very well received. We're getting great feedback from physicians in our market research surveys and anecdotally through our sales force. So, we do expect to see that continued quarter-over-quarter prescription growth and revenue growth and the magnitude of that depends on the rate of the COVID recovery and how schizophrenia patients come back, the access of our sales representatives. But we feel good about how we're executing in this environment. So, I hope that's helpful.

Sharon Mates -- Founder, Chairman and Chief Executive Officer

I'd like to just return to Andrew's question before we go on to the next one. I'm not sure I gave you a complete answer. The real answer is that at the present time, we have no indication that we will have an AdCom and we do believe that our application is straightforward. And having said that, as I said before, our letter didn't have any information regarding an AdCom.

Andrew Tsai -- Jefferies -- Analyst

Perfect. Thank you.

Operator

[Operator Instructions] Our next question comes from Graig Suvannavejh with Goldman Sachs.

Mansi -- Goldman Sachs -- Analyst

Hi, this is Mansi [Phonetic] on for Graig. Thank you for taking our questions. So on 333 in opioid disorder, if you could give us some color around the ideal results, which is like from that trial or is there a benchmark that you are looking for? Thank you.

Sharon Mates -- Founder, Chairman and Chief Executive Officer

I'm sorry, you blanked out right at the important part of the question, I know something about 333, but I don't know what you were -- you then went fuzzy. Can you repeat it?

Mansi -- Goldman Sachs -- Analyst

Yeah, sure. So what would the ideal results look like for the Phase 1 trial of ITI-333 in opioid disorder? Is there a benchmark that you are looking for?

Sharon Mates -- Founder, Chairman and Chief Executive Officer

Well, yes. So, obviously, it's extremely important that you demonstrate safety and tolerability. So that is overall extremely important and then, of course, the PK. So that's -- this is a single ascending dose study and we started very low in dose and we have been escalating the dose through the different cohorts and we've now completed several cohorts and obviously looking to continue seeing safety and tolerability we've been seeing and to measure the pharmacokinetics and then we expect the results from this study by year end. And then we would go into a multiple ascending dose study.

Mansi -- Goldman Sachs -- Analyst

Okay, thank you.

Operator

Our next question comes from Ashwani Verma with Bank of America.

Ashwani Verma -- Bank of America -- Analyst

Hi, thanks for taking our question. Congrats on all the progress. So I had just one quick one. Wanted to ask about the CAPLYTA script growth trends. Were there any extraneous factors impacting the 1Q aside from COVID? I ask that because the sequential growth went from 74% in 4Q to 23% in 1Q. And do you think this kind of growth will bounce back from 1Q levels as I realize that you need at least 23% growth for the remainder of the year to hit the consensus?

Sharon Mates -- Founder, Chairman and Chief Executive Officer

So Mark, maybe you could take that and you can talk about the anti-psychotics, in general, what we've seen.

Mark Neumann -- Executive Vice President, Chief Commercial Officer

Yeah. Hi, good question, Ash, and yes, I think in the overall anti-psychotic market, the first quarter of this year versus the fourth quarter of last year, there was actually a slight decline in the number of prescriptions and when you look at the oral branded market, it was a more significant decline overall. So during that time, CAPLYTA was able to grow at 23%. I think what you see in the first quarter is a combination of some seasonal effect where patients are required to get reauthorization on prior authorizations. You see some impact on revenues of increased gross-to-net for certain products because there is more out-of-pocket payment assistance provided to patients.

Now, what I would say with CAPLYTA is we are affected to a lesser degree by those things because our predominant patient type is the dual eligible Medicare patient that is not exposed to high deductible insurance plans or to a little bit later going into the donut hole or exempt from that. So, we're not hit on the revenue side from that.

On the prescription side, CAPLYTA is subject to some of the same reauthorization seasonal impact that you see in the first quarter that will begin to go away in the second quarter and get better as the year goes on. And so we do expect to see continued quarter-over-quarter growth in prescriptions in revenues for CAPLYTA. And as I mentioned, we have seen some incremental improvements recently in March and April to the market conditions due to COVID. We expect that to continue, but we expect to see the greatest advancements there in the second half of the year and that's when we believe we'll see further prescription acceleration.

But again, we feel good about the product, how well it's being received. We feel good about how well the team is executing even during challenging market conditions and we look forward to those conditions improving and really having the opportunity to drive prescription growth for CAPLYTA to even greater extent.

Ashwani Verma -- Bank of America -- Analyst

Yeah. Got it. Thank you.

Operator

That concludes today's question-and-answer session. I'd like to turn the call back to Dr. Mates for closing remarks.

Sharon Mates -- Founder, Chairman and Chief Executive Officer

Thank you everyone for participating on today's call. We look forward to updating you as we get updated and we look forward to bringing new medicines to patients and to our PDUFA date for bipolar depression, we're very excited about that here at Intra-Cellular Therapies. Operator, you can now disconnect.

Operator

[Operator Closing Remarks]

Duration: 52 minutes

Call participants:

Juan Sanchez -- Vice President of Corporate Communications and Investor Relations

Sharon Mates -- Founder, Chairman and Chief Executive Officer

Mark Neumann -- Executive Vice President, Chief Commercial Officer

Lawrence J. Hineline -- Senior Vice President of Finance & Chief Financial Officer

Brian Abrahams -- RBC Capital Markets -- Analyst

Jessica Fye -- J.P. Morgan -- Analyst

Charles C. Duncan -- Cantor Fitzgerald -- Analyst

Bo Chen -- Evercore -- Analyst

Rudy Li -- SVB Leerink -- Analyst

Andrew Tsai -- Jefferies -- Analyst

Mansi -- Goldman Sachs -- Analyst

Ashwani Verma -- Bank of America -- Analyst

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