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Generical name: tasimelteon [TAS-i-MEL-tee on [TAS-i-MEL-tee on
Brand names: Hetlioz, Hetlioz LQ
Dosage forms: oral capsule (20 mg), oral suspension (4 mg/mL).
The class of drugs: miscellaneous anxiolytics and hypnotics, as well as sedatives

What is Tasimelteon?

Tasimelteon can be described as a sedative drug that helps treat 24-hour sleep-wake disorders in adults. Tasimelteon can also be used to treat insomnia in patients with an inherited disorder known as Smith-Magenis syndrome (SMS). Tasimelteon in capsule form is intended for those who suffer from SMS and are at least 15 years old. The oral suspension (liquid) version is designed for kids with SMS that are 3 to 15 years old.

Side effects of Tasimelteon

See a doctor immediately. Get medical attention immediately if you notice symptoms that indicate an allergic reaction, such as difficulty breathing, hives, or swelling of your lips, face, or tongue.

Contact your doctor immediately. If you feel burning or pain after you need to urinate, Some side effects are more common in older people.

Common negative effects of tasimelteon include:

  • Headache;
  • Atypical liver function tests
  • Strange dreams, nightmares, or
  • Symptoms of a cold, like nasal stuffiness, sneezing, and a sore throat.

This isn't an exhaustive list of all the side effects. Others could happen. Consult your physician for advice regarding medical effects. You can report any adverse reactions to the FDA at 1-800-FDA-1088.


Take only according to the directions. Talk to your doctor if you are taking other medications or suffer from any other medical condition or allergies.

Before you start taking this medicine

Inform your doctor if you were ever diagnosed with:

  • Liver disease or
  • If you smoke.

Inform your doctor if you are nursing or pregnant. Don't give Tasimelteon to any child without a medical recommendation. Tasimelteon is approved for treating sleep disorders at night only in children who suffer from SMS and are at least 3 years old. Tasimelteon has not been approved for treating non-24-hour sleep-wake disorders in people under the age of 18.

How to take Tasimelteon?

Follow all instructions on the prescription label and go through all medication guides or instructions. Follow the medication precisely as directed. Do not eat or drink 1 hour prior to your usual bedtime. Do this at the same hour each evening. Follow all instructions for use. Contact your pharmacist or doctor if you require assistance. Do not let a young child take tasimelteon for use without assistance from an adult. Take and swallow the capsule intact; don't crush, chew, break, or break it open.

Tasimelteon capsules can be used by people aged 16 and older. Tasimelteon oral suspensions are intended for use only by children ranging from three to fifteen years old. The suspension should be shaken for at least 30 seconds before you take the dose. Make use of the syringe supplied or a device for measuring doses (not an ordinary spoon). Don't take the adapter for the syringe out of the neck of the bottle. Cap the bottle and store it in the refrigerator every time you use it. medication errors by making sure you use the exact form the doctor prescribes.

Doses are determined by the weight of the children. The dose for your child could alter if your child is overweight or loses weight. It is possible to not reap the full benefits of this medication for a few months or even weeks. Keep capsules at room temperature, away from heat, humidity, and light. The fluid medication in your refrigerator Get rid of any remaining liquid five weeks following the opening of the 48-mL bottle or eight weeks following the opening of the bottle, which is 158 milliliters.

Details on dosage

Usual Adult Dose for Insomnia:

20 mg taken orally every day

Take at least an hour before bed and at the same exact time each evening.
Take it with no food.

Use: Treatment of Non-24-Hour Sleep-Wake Disorder (Non-24)

What happens if I miss a dose?

Take a break if you can't take it at your regular time on a particular night.

Do not take two doses at once.

What happens if I overdose?

For medical emergencies, seek emergency medical attention or contact the Poison Help line at 1-800-222-1222.

Avoid this

After taking tasimelteon, avoid doing anything else before changing into bed.

Interaction with other drugs

Combining tasimelteon with other medications that cause drowsiness can increase the severity of this effect. Consult your physician before taking opioids, sleeping pills, muscle relaxers, or medication to treat anxiety or seizures. It is sometimes not safe to take certain medications simultaneously. Certain drugs may affect your blood levels and the other medications that you take, which can create side effects or render the drugs less effective. Other medications can affect the tasimelteon hormone, such as prescription and over-the-counter medicines, vitamins, and herbal products. Discuss with your doctor all other medications you take.