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People who take too much Sinequan may have overdose symptoms that could include:
  • Change in heart rhythm (arrhythmia)
  • Very low blood pressure (hypotension)
  • Seizures
  • Drowsiness
  • Coma
  • Confusion
  • Trouble concentrating
  • Hallucinations
  • Dilated (wide open) pupils
  • Agitation
  • Muscle tension
  • Vomiting
  • Low body temperature (hypothermia) or fever (hyperthermia)
  • Loss of life.
Overdose with Sinequan can be very dangerous. If you happen to take an overdose, seek medical attention immediately.
(Click Doxepin Overdose for more information.)

Sinequan Storage Methods

Sinequan should be stored at room temperature, away from moisture and heat. The capsules and oral solution should be kept in an airtight container.
Keep Sinequan and all medications out of the reach of children.

What Should I Do If I Miss a Dose?

If you do not take your Sinequan as scheduled, take your missed dose as soon as you remember. However, if you usually take your dose at night, you may not want to make up the missed dose, due to the risk of drowsiness if Sinequan is taken during the day. Also, if it almost time for your next dose, skip the missed dose and continue with your regular schedule. Do not take a double dose of Sinequan.


Brand-name Sinequan is no longer available. Generic Sinequan capsules are available in the following strengths:
  • Doxepin 10 mg capsules
  • Doxepin 25 mg capsules
  • Doxepin 50 mg capsules
  • Doxepin 75 mg capsules
  • Doxepin 100 mg capsules
  • Doxepin 150 mg capsules.
The liquid form is available in one strength -- doxepin solution 10 mg per mL.
Written by/reviewed by:
Last reviewed by: Kristi Monson, PharmD;
Last updated/reviewed:
List of references (click here):
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