thoughtscape NP Psychiatry · Patient education
Doxepin
Sleep tablets • Antidepressant capsules
One medicine, different jobs. Low-dose sleep tablets and antidepressant capsules have different instructions.
Draft for review · Clinical content has not been revalidated for this website.
Sleep tablets: 3 or 6 mg. Antidepressant doses are higher. Skin cream is a separate treatment, not a sleep medicine.
What it is used for
Low-dose tablets treat trouble staying asleep. Capsules treat depression; some older capsule labels also include anxiety.
Selected pain or itch treatment is off-label. A 10-mg capsule used for sleep is not the approved 3-6 mg sleep-tablet regimen.
How it works
Low-dose sleep treatment mainly blocks histamine H1 signals that promote wakefulness. It can still cause next-day impairment.
Higher doses also change serotonin and norepinephrine signaling. Other actions can cause dry mouth, constipation, dizziness, or heart risks.
What to expect over time
FIRST NIGHTS
Sleep benefit may begin early. Allow 7-8 hours in bed. Report next-day impairment rather than adding or changing doses yourself.
OVER WEEKS
Depression may start improving over 2-4 weeks. Keep early follow-ups and report worsening mood or suicidal thoughts promptly.
AT REVIEW
If insomnia persists or worsens after 7-10 days, call. Review other causes, sleep habits, daytime function, and side effects.
Taking your medication
Follow your exact product and schedule. Sleep tablets go within 30 minutes of bed, at least 3 hours after a meal. Never add an extra overnight dose.
Capsule doses may be once daily or divided. Do not substitute strengths or forms yourself. Liquid requires accurate measurement and pharmacist-guided dilution.
Avoid alcohol. Do not drive after a sleep dose; be fully alert the next day. The antidepressant-capsule guide advises avoiding driving or machinery.
When to get help
Emergency: overdose, seizure, collapse, breathing trouble, or immediate self-harm danger. Get help now; low-dose tablets do not make overdose harmless.
Urgent care: fainting, irregular heartbeat, eye pain, inability to urinate, painful severe constipation, or fever with confusion and stiffness.
Stop sleep tablets and call: activity you do not remember, such as sleep-driving. Report worsening mood, unusual high energy, or confusion promptly.
Early side effects
Drowsiness can occur even at low doses. Higher doses may cause dry mouth, constipation, blurred vision, sweating, or fast pulse. Rise slowly.
Other effects to discuss
Weight, appetite, or sexual effects may change at higher doses. Report falls or urinary trouble. Dental care and a bowel plan may help.
What to keep track of
Review mood, alertness, falls, weight, blood pressure, bowels, and bladder. ECG or blood tests depend on risks and symptoms. A drug level sometimes helps at antidepressant doses; it is not a routine sleep-dose test. New confusion, weakness, or falls may need a sodium check.
Before you start
Discuss glaucoma, trouble urinating, bipolar disorder, seizures, heart disease, fainting, liver/kidney problems, sleep apnea, constipation, and pregnancy plans. Capsule and sleep-tablet restrictions differ; glaucoma or urinary retention may rule out treatment. Severe sleep apnea generally calls for another option. Older adults and people with liver disease usually start sleep treatment at 3 mg. Tell the clinician about all medicines and past unusual sleep behaviors.
Medicines & interactions
MAOIs and serotonin medicines
Do not combine with an MAOI; allow 14 days between treatments in either direction. Tell clinicians before linezolid or IV methylene blue. Review antidepressants, tramadol, and other serotonin medicines.
Alcohol, sedatives, and drying medicines
Avoid alcohol. Opioids, sleeping pills, and sedating antihistamines increase impairment. Other anticholinergic medicines can worsen constipation, urinary trouble, and confusion.
Medicines that change doxepin levels
Cimetidine raises levels: the sleep-tablet maximum is 3 mg with it. Some antidepressants also raise levels; carbamazepine may lower them. Ask before starting or stopping medicines.
Heart, seizure, and diabetes medicines
Review drugs affecting heart rhythm or seizure risk. Tolazamide with doxepin has caused severe low blood sugar. Give every clinician and pharmacist your full medicine and supplement list.
Everyday tips
Keep a steady wake time and a simple sleep log. CBT-I can help persistent insomnia.
For depression, track mood and daily function, not just sleep. Therapy can complement medication.
Use one clear medication list and check the label at each refill. Never share your prescription.
Secure all strengths away from children and anyone at risk of overdose. Ask about a safer supply plan.
Your questions, answered
What if I miss a dose?
For capsules, take it when remembered unless the next dose is near; never double. For sleep tablets, skip if you cannot allow 7-8 hours in bed. Never take an extra dose after waking in the night.
Can I stop when I feel better?
Plan a gradual taper for antidepressant doses. Low-dose 3-6 mg sleep treatment usually does not need a taper, but discuss returning insomnia. Do not apply one formulation's stopping advice to another.
Pregnant or breastfeeding?
Contact your prescriber before pregnancy or promptly if pregnant; make an individual plan. Late-pregnancy exposure may affect a newborn's breathing, feeding, or alertness. Do not breastfeed during treatment; discuss alternatives.
What if too much is taken?
Get help immediately, even before symptoms. In the US call Poison Help, 1-800-222-1222; call 911 for collapse, seizure, breathing trouble, or inability to wake. Elsewhere use local emergency services.
Storage & safety
Keep the original pack at the labeled room temperature, protected from light and secured out of sight and reach of children and pets. Ask the pharmacist how to dispose of unused medicine.
About this information
For general information only; not a substitute for individualized medical advice. This sheet does not cover every risk or interaction. Ask your prescriber or pharmacist before changing how you take this medication.
Sources
Educational inclusion does not mean this medication or its indications are treated at this practice. Review the guide for your exact product with your prescriber or pharmacist.