ITCI Intra Cellular Therapies Inc

Exhibit 99.1

Intra-Cellular Therapies Announces Positive Topline Results in Phase 3 Trial Evaluating CAPLYTA for the Prevention of Relapse in Patients with Schizophrenia

The efficacy and safety of CAPLYTA (lumateperone) as a maintenance treatment in adults with schizophrenia was demonstrated in a randomized withdrawal trial

The study demonstrated a statistically significant (p=0.0002) longer time to relapse in schizophrenia patients treated with lumateperone compared to placebo

Bedminster, N.J., Nov. 05, 2024 (GLOBE NEWSWIRE) — Intra-Cellular Therapies, Inc. (Nasdaq: ITCI), a biopharmaceutical company focused on the development and commercialization of therapeutics for central nervous system (CNS) disorders, today announced positive results from Study 304 evaluating the efficacy and safety of lumateperone 42 mg for the prevention of relapse in adult patients with schizophrenia.

“Schizophrenia is a chronic, serious mental illness characterized by the occurrence of acute psychotic episodes that cumulatively worsen disease prognosis. The control of symptoms and the prevention of relapses is critical to improving long-term patient outcomes. We are very pleased that the results from Study 304, a randomized withdrawal trial, demonstrated efficacy along with favorable safety and tolerability which support the benefit of continued long-term treatment with lumateperone,” said Dr. Suresh Durgam, Executive Vice President and Chief Medical Officer of Intra-Cellular Therapies.

On the primary endpoint, time to relapse during the double-blind treatment phase was significantly longer in patients receiving lumateperone compared to those receiving placebo (p=0.0002). There were 18 relapses (16.4%) in the lumateperone group versus 44 relapses (38.6%) in the placebo group. Treatment with lumateperone was associated with a 63% reduction in risk of relapse versus placebo (hazard ratio [95% CI] = 0.37, [0.22, 0.65]).

Lumateperone also met the key secondary endpoint, time to all cause discontinuation during the double-blind phase (p=0.0007).

In this study, lumateperone was generally safe and well tolerated. In the double-blind phase, the most commonly reported adverse event that was observed at a rate greater than or equal to 5% and twice the rate of placebo was headache.

About Study 304 This study was a multicenter, multi-national, randomized, double-blind, placebo-controlled, parallel group study of lumateperone for the prevention of symptomatic relapse in adult patients with schizophrenia. This approximately 47-week study included an 18-week open-label phase where patients with schizophrenia were treated with lumateperone 42 mg per day. Patients who met the stabilization criteria during the open-label period progressed to the double-blind

treatment phase. These patients were randomized to continue on lumateperone 42 mg (N=114) or switched to placebo (N=114) for up to 26 weeks or until the time to relapse occurred. The primary endpoint was time to first symptom relapse and the key secondary endpoint was time to all cause discontinuation during the double-blind phase.

CAPLYTA^® (lumateperone) is indicated in adults for the treatment of schizophrenia and for the treatment of depressive episodes associated with bipolar I or II disorder (bipolar depression) as monotherapy and as adjunctive therapy with lithium or valproate.

Important Safety Information

Boxed Warnings:

Contraindications: CAPLYTA is contraindicated in patients with known hypersensitivity to lumateperone or any components of CAPLYTA. Reactions have included pruritus, rash (e.g., allergic dermatitis, papular rash, and generalized rash), and urticaria.

Warnings & Precautions: Antipsychotic drugs have been reported to cause:

Drug Interactions: CAPLYTA should not be used with CYP3A4 inducers. Dose reduction is recommended for concomitant use with strong CYP3A4 inhibitors or moderate CYP3A4 inhibitors.

Special Populations: Newborn infants exposed to antipsychotic drugs during the third trimester of pregnancy are at risk for extrapyramidal and/or withdrawal symptoms following delivery. Dose reduction is recommended for patients with moderate or severe hepatic impairment.

Adverse Reactions: The most common adverse reactions in clinical trials with CAPLYTA vs. placebo were somnolence/sedation, dizziness, nausea, and dry mouth.

CAPLYTA is available in 10.5 mg, 21 mg, and 42 mg capsules.

Please click here to see full Prescribing Information including Boxed Warning.

About CAPLYTA (lumateperone)

CAPLYTA 42 mg is an oral, once daily atypical antipsychotic approved in adults for the treatment of schizophrenia and the treatment of depressive episodes associated with bipolar I or II disorder (bipolar depression) as monotherapy and as adjunctive therapy with lithium or valproate. While the mechanism of action of CAPLYTA is unknown, the efficacy of CAPLYTA could be mediated through a combination of antagonist activity at central serotonin 5-HT2A receptors and postsynaptic antagonist activity at central dopamine D2 receptors.

Lumateperone is being studied for the treatment of major depressive disorder, and other psychiatric and neurological disorders. Lumateperone is not approved by the U.S. Food and Drug Administration, or FDA, for these disorders.

About Intra-Cellular Therapies

Intra-Cellular Therapies is a biopharmaceutical company founded on Nobel prize-winning research that allows us to understand how therapies affect the inner-workings of cells in the body. The company leverages this intracellular approach to develop innovative treatments for people living with complex psychiatric and neurologic diseases. For more information, please visit www.intracellulartherapies.com.

Forward-Looking Statements

This news release contains “forward-looking statements” within the meaning of the Private Securities Litigation Reform Act of 1995 that involve risks and uncertainties that could cause actual results to be materially different from historical results or from any future results expressed or implied by such forward-looking statements. Such forward-looking statements include statements regarding, among other things, our expectations regarding the commercialization of CAPLYTA; our plans to conduct clinical or non-clinical trials and the timing of developments with respect to those trials, including enrollment, initiation or completion of clinical conduct, or the availability or reporting of results; plans to make regulatory submissions to the FDA and the timing of such submissions; whether clinical trial results will be predictive of future real-world results; whether CAPLYTA will serve an unmet need; the goals of our development programs; our beliefs about the potential utility of our product candidates; and development efforts and plans under the caption “About Intra-Cellular Therapies.” All such forward-looking statements are based on management’s present expectations and are subject to certain factors, risks and uncertainties that may cause actual results, outcome of events, timing and performance to differ materially from those expressed or implied by such statements. These risks and uncertainties include, but are not limited to, the following: there are no guarantees that CAPLYTA will be commercially successful; we may encounter issues, delays or other challenges in commercializing CAPLYTA; whether CAPLYTA receives adequate reimbursement from third-party payors; the degree to which CAPLYTA receives acceptance from patients and physicians for its approved indications; challenges associated with execution of our sales activities, which in each case could limit the potential of our product; results achieved in CAPLYTA in the treatment of schizophrenia and bipolar depression following commercial launch of the product may be different than observed in clinical trials, and may vary among patients; challenges associated with supply and manufacturing activities, which in each case could limit our sales and the availability of our product; risks associated with our current and planned clinical trials; we may encounter unexpected safety or tolerability issues with CAPLYTA following commercial launch for the treatment of schizophrenia or bipolar depression or in ongoing or future trials and other

development activities; there is no guarantee that a generic equivalent of CAPLYTA will not be approved and enter the market before the expiration of our patents; there is no guarantee that our planned supplemental NDA for the treatment of major depressive disorder, or MDD, will be submitted or approved, if at all, on the timeline that we expect; our other product candidates may not be successful or may take longer and be more costly than anticipated; product candidates that appeared promising in earlier research and clinical trials may not demonstrate safety and/or efficacy in larger-scale or later clinical trials or in clinical trials for other indications; our proposals with respect to the regulatory path for our product candidates may not be acceptable to the FDA; our reliance on collaborative partners and other third parties for development of our product candidates; impacts on our business, including on the commercialization of CAPLYTA and our clinical trials, as a result of the COVID-19 pandemic, the conflicts in Ukraine, Russia and the Middle East, global economic uncertainty, inflation, higher interest rates or market disruptions; and the other risk factors detailed in our public filings with the Securities and Exchange Commission. All statements contained in this press release are made only as of the date of this press release, and we do not intend to update this information unless required by law.

Contact:

Intra-Cellular Therapies, Inc.

Juan Sanchez, M.D.

Vice President, Corporate Communications and Investor Relations

646-440-9333

Burns McClellan, Inc.

Cameron Radinovic

cradinovic@burnsmc.com

646-930-4406