Orexin Agonists to Treat Narcolepsy

The US Food and Drug Administration (FDA) approved the first drug in the orexin agonist class – Orzeyful® – in August 2026. For many years before this, other available narcolepsy drugs worked only to ease certain symptoms. Orzeyful® addresses the root cause of narcolepsy type 1, orexin deficiency.^1,2

How do orexin agonists work?

Orexin is a brain chemical. It is also called hypocretin. Orexin helps you stay awake, and it also helps control REM sleep. Cells in a part of the brain called the hypothalamus make it.^1,3

Most people with narcolepsy type 1 have lost these cells. Without them, orexin levels fall very low. This loss is the main cause of narcolepsy type 1. It is why you may fall asleep during the day or have cataplexy, the sudden loss of muscle tone and weakness that characterizes type 1.³

Orexin agonists act on orexin receptors in the brain. Receptors are the docking points that orexin attaches to. When orexin is missing, those docking points sit unused. An orexin agonist switches them on. This restores some of the signal the lost cells no longer send.^1,2

Other narcolepsy drugs do not work this way. Stimulants promote wakefulness, and antidepressants can reduce cataplexy. Both ease symptoms, but they cannot replace the missing signal. The FDA describes orexin agonists as the first drugs to be able to do this.¹

Examples of orexin agonists

One drug in this class is approved in the United States:^1,2

• Orzeyful® (oveporexton) – Approved in August 2026 to treat narcolepsy type 1 in adults. It is approved to improve wakefulness during the day and to reduce cataplexy episodes. It is a tablet you take by mouth.

What are the possible side effects?

Side effects can vary depending on the specific treatment or drug you are taking. The most common side effects reported were:¹

• Trouble sleeping – Difficulty falling asleep or staying asleep at night.
• Needing to urinate more often – Going more frequently, or feeling a sudden urge to go.
• More saliva – Making more saliva than usual.

Few people stopped taking the drug because of side effects.¹

These are not all the possible side effects of orexin agonists. Talk to your doctor about what to expect when taking orexin agonists. You also should call your doctor if you have any changes that concern you when taking this medication.

Other things to know

Orzeyful® is approved for adults with narcolepsy type 1. It is not approved for narcolepsy type 2. The drug works by replacing a missing orexin signal, and most people with type 2 already have normal orexin levels. Safety and effectiveness are not known in people under 18 years old.^1-3

The FDA has approved Orzeyful®, but you cannot get a prescription for it yet. The FDA recommended that it be scheduled under the Controlled Substances Act. The Drug Enforcement Administration (DEA) has to make that decision first. Ask your doctor where things stand before you plan any changes to your treatment.^1,2

Orzeyful® should not be taken with strong CYP3A inhibitors. These are drugs that change how your body breaks down other drugs. Your doctor or pharmacist can tell you whether anything you take falls into this group.^1,2,4

Before beginning treatment for narcolepsy, tell your doctor about all your health conditions and any other drugs, vitamins, or supplements you take. This includes over-the-counter drugs.

A new drug class does not mean a new plan is right for you. What works well is different for each person, and the treatment you take now may still be the better fit. Your doctor can help you weigh your options, and you are not alone in sorting this out.