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May 2, 2023May 01, 2023 - Avadel Pharmaceuticals plc, announced today that the U.S. Food & Drug Administration (FDA) has granted final approval to Lumryz, an extended-release formulation of sodium oxybate indicated to be taken once at bedtime for the treatment of cataplexy or excessive daytime sleepiness (EDS) in adults with narcolepsy. With final approval, Lumryz becomes the first and only FDA approved once-at-bedtime oxybate for people living with narcolepsy. Lumryz was additionally granted Orphan Drug Exclusivity by the FDA.
Narcolepsy is a chronic neurological condition that impairs the brain's ability to regulate the sleep-wake cycle. The condition affects approximately one in 2,000 people in the United States with the cardinal symptom of EDS. Additional symptoms can vary by person but may include disrupted nighttime sleep, a sudden loss of muscle tone usually triggered by strong emotion (cataplexy), sleep paralysis and hallucinations.
With this approval, the FDA has also found Lumryz to be clinically superior to currently marketed twice- nightly oxybate products and granted Lumryz seven years of Orphan Drug Exclusivity. In particular, the FDA found that Lumryz makes a major contribution to patient care over currently available, twice-nightly oxybate products by providing a once-nightly dosing regimen that avoids nocturnal arousal to take a second dose. (Xyrem, a sodium oxybate oral susbension, requires a second dose 2.5 to 4 hours after the first dose.) The FDA's Orphan Drug program is designed to support the development of drugs that treat a condition affecting less than 200,000 U.S. patients. The seven-year market exclusivity for Lumryz began on the date of FDA approval, May 1, 2023.
Lumryz has a boxed warning as a central nervous system depressant, and for its potential for abuse and misuse. Lumryz is available only through a restricted program under a Risk Evaluation and Mitigation Strategy called the Lumryz REMS. Most common adverse reactions (incidence > 5% and greater than placebo) reported for all doses of Lumryz combined were nausea, dizziness, enuresis, headache, and vomiting.