Tasimelteon - oral
Tasimelteon - oral
Tasimelteon is used to treat a certain sleep disorder (non-24-hour sleep-wake disorder). It works like a natural substance called melatonin that your body produces. It helps to control your sleep-wake cycle (circadian rhythm). Tasimelteon may improve your ability to sleep at night and to be more active during the day.
Take this medication by mouth on an empty stomach as directed by your doctor, usually before bedtime. Swallow the capsule whole.
It is very important to take this medication at the same time each night so that you can form a normal sleep-wake cycle. See also Missed Dose section.
It may take up to several months before you get the full benefit of this drug.
Tell your doctor if your condition does not improve or if it worsens.
Headache, nightmares, or strange dreams may occur. If any of these effects persist or worsen, tell your doctor or pharmacist promptly. Tasimelteon may also make you drowsy during the day. Talk to your doctor or pharmacist if you have daytime drowsiness.
Remember that your doctor has prescribed this medication because he or she has judged that the benefit to you is greater than the risk of side effects. Many people using this medication do not have serious side effects.
A very serious allergic reaction to this drug is rare. However, get medical help right away if you notice any symptoms of a serious allergic reaction, including:
In the US -
Before taking tasimelteon, tell your doctor or pharmacist if you are allergic to it; or if you have any other allergies. This product may contain inactive ingredients, which can cause allergic reactions or other problems. Talk to your pharmacist for more details.
Before using this medication, tell your doctor or pharmacist your medical history, especially of:
This drug may make you drowsy. Alcohol or marijuana (cannabis) can make you more drowsy. Do not drive, use machinery, or do anything that needs alertness until you can do it safely. Limit alcoholic beverages. Talk to your doctor if you are using marijuana (cannabis).
During pregnancy, this medication should be used only when clearly needed. Discuss the risks and benefits with your doctor.
It is unknown if this medication passes into breast milk. Consult your doctor before breast-feeding.
Other medications can affect the removal of tasimelteon from your body, which may affect how tasimelteon works. Examples include ciprofloxacin, fluvoxamine, rifamycins (such as rifabutin), St. John's wort, drugs used to treat seizures (such as carbamazepine, phenytoin), among others.
Tell your doctor or pharmacist if you are taking other products that cause drowsiness such as opioid pain or cough relievers (such as codeine, hydrocodone), alcohol, marijuana (cannabis), other drugs for sleep or anxiety (such as alprazolam, lorazepam, zolpidem), muscle relaxants (such as carisoprodol, cyclobenzaprine), or antihistamines (such as cetirizine, diphenhydramine).
Check the labels on all your medicines (such as allergy or cough-and-cold products) because they may contain ingredients that cause drowsiness. Ask your pharmacist about using those products safely.
Cigarette smoking decreases blood levels of this medication. Tell your doctor if you smoke or if you have recently stopped smoking.
Do not share this medication with others.
If you miss a dose, skip the missed dose. Take your next dose at the regular time. Do not double the dose to catch up.
Store at room temperature away from light and moisture. Do not store in the bathroom. Keep all medications away from children and pets.
Information last revised October 2018.
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