NLS Pharmaceutics AG, a clinical-stage biopharmaceutical company, engages in the discovery and development of therapies for patients with rare and complex central nervous system disorders. The company is focusing on the development of treatments for narcolepsy, idiopathic hypersomnia, and other rare sleep disorders, as well as neurodevelopmental disorders, such as attention deficit hyperactivity disorder (ADHD). Its lead product candidates include Quilience for the treatment of narcolepsy; and Nolazol for the treatment of ADHD. The company also develops NLS-4, a selective dopamine reuptake inhibitor treatment for the chronic fatigue associated with the symptoms of Long-COVID; NLS-3, a repurposed reverse ester of methylphenidate for treatment of ADHD; NLS-8, a melatonin ML1A receptor agonist for improved scopolamine-induced amnesia; NLS-11, a norepinephrine and dopamine reuptake inhibitor and muscarinic M1, M2, M3 receptor antagonist; and NLS-12, a norepinephrine and dopamine reuptake inhibitor and muscarinic M4 receptor antagonist. It has licensing agreements with Pegasus Advanced Research for use of mazindol for the treatment of ADHD. NLS Pharmaceutics AG was incorporated in 2015 and is headquartered in Zurich, Switzerland.