— FDA Action Expected by Jan. 31, 2019 —

DUBLIN, Ireland I April 16, 2018 I Alkermes plc (Nasdaq: ALKS) today announced that the U.S. Food and Drug Administration (FDA) has accepted for review the New Drug Application (NDA) for ALKS 5461, a novel, once-daily, oral investigational medicine for the adjunctive treatment of major depressive disorder (MDD) in patients with an inadequate response to standard antidepressant therapies. FDA’s target action date for the ALKS 5461 NDA is Jan. 31, 2019.

FDA’s acceptance of the ALKS 5461 NDA and rescission of the Refusal to File letter issued March 30, 2018 follows productive interactions with the Agency in which Alkermes clarified certain aspects of the NDA submission. No additional data or analyses were submitted by Alkermes to FDA.

“FDA’s filing of the ALKS 5461 application is a positive step forward for patients suffering from major depressive disorder, a serious disease where inadequate response to existing antidepressants remains a well-known and significant treatment limitation, and where there have been no new pharmacological treatment approaches in 30 years,” stated Craig Hopkinson, M.D., Chief Medical Officer and Senior Vice President of Medicines Development and Medical Affairs at Alkermes. “We will continue to engage with the FDA throughout the review process, as we work to bring this important medicine to patients.”

The NDA filing for ALKS 5461 is based on results from a clinical efficacy and safety package with data from more than 30 clinical trials and more than 1,500 patients with MDD. Throughout the clinical development program, ALKS 5461 demonstrated a consistent profile of antidepressant activity, safety and tolerability in the adjunctive treatment of MDD.

Conference Call Information
Alkermes will host a conference call at 8:30 a.m. ET (1:30 p.m. BST) on Monday, April 16, 2018, to discuss this update. The conference call may be accessed by visiting Alkermes’ website or by dialing +1 888 424 8151 for U.S. callers and +1 847 585 4422 for international callers. The conference call ID number is 6037988. In addition, a replay of the conference call will be available from 11:00 a.m. ET (4:00 p.m. BST) on Monday, April 16, 2018, through 5:00 p.m. ET (10:00 p.m. BST) on Monday, April 23, 2018, and may be accessed by visiting Alkermes’ website or by dialing +1 888 843 7419 for U.S. callers and +1 630 652 3042 for international callers. The replay access code is 6037988.

About ALKS 5461
ALKS 5461 is a proprietary, investigational, once-daily oral medicine that acts as an opioid system modulator and represents a novel mechanism of action for the adjunctive treatment of major depressive disorder (MDD) in patients with an inadequate response to standard antidepressant therapies. ALKS 5461 is a fixed-dose combination of buprenorphine, a partial mu-opioid receptor agonist and kappa-opioid receptor antagonist, and samidorphan, a mu-opioid receptor antagonist.

About MDD
According to the DSM-5® (Diagnostic and Statistical Manual of Mental DisordersFifth Edition), major depressive disorder (MDD) is a condition in which patients exhibit depressive symptoms, such as a depressed mood or a loss of interest or pleasure in daily activities consistently for at least a two-week period, and demonstrate impaired social, occupational, educational or other important functioning. An estimated 16.2 million people in the U.S. suffered from MDD in 2016,1 the majority of whom may not adequately respond to initial antidepressant therapy.2

About Alkermes plc
Alkermes plc is a fully integrated, global biopharmaceutical company developing innovative medicines for the treatment of central nervous system (CNS) diseases. The company has a diversified commercial product portfolio and a substantial clinical pipeline of product candidates for chronic diseases that include schizophrenia, depression, addiction and multiple sclerosis. Headquartered in Dublin, Ireland, Alkermes plc has an R&D center in Waltham, Massachusetts; a research and manufacturing facility in Athlone, Ireland; and a manufacturing facility in Wilmington, Ohio. For more information, please visit Alkermes’ website at www.alkermes.com.

1 National Institutes of Mental Health: Major Depression. Accessed on April 15, 2018 from https://www.nimh.nih.gov/health/statistics/major-depression.shtml.
2 Rush AJ et al (2007) Am J. Psychiatry, 163:11, pp. 1905-1917 (STAR*D Study).

SOURCE: Alkermes