For insomnia, 10 mg of doxepin is above the FDA-labeled maximum of 6 mg per day. The FDA-approved insomnia dose is usually 3 mg or 6 mg. Adults generally start at 6 mg, while adults age 65 or older usually start at 3 mg. A prescriber may intentionally prescribe 10 mg, but you should not increase your dose or take an extra dose without checking first.
Doxepin Dosage for Insomnia at a Glance
| Situation | Typical labeled dose |
|---|---|
| Adults with insomnia | 6 mg once nightly |
| Some adults who need a lower dose | 3 mg once nightly |
| Adults age 65 or older | Start at 3 mg; may increase to 6 mg |
| FDA-labeled maximum for insomnia | 6 mg per day |
| 10 mg dose | Above the labeled insomnia range |
Doxepin also comes in 10 mg, 25 mg, 50 mg, 75 mg and 100 mg capsules. These capsules are used for conditions such as major depressive disorder and are different from the 3 mg and 6 mg tablets labeled for insomnia.
Is 10 mg Doxepin Dangerous If You Took It Once?
A single 10 mg dose is not automatically a medical emergency. The risk depends on your age, health conditions, other medicines and whether you also used alcohol or sedatives.
Do not take more doxepin that night. Avoid driving or operating machinery if you feel sleepy, dizzy or impaired.
Call Poison Help at 1-800-222-1222 in the United States if you took more than prescribed, combined doxepin with alcohol or other sedating medicines, or are unsure what to do.
Call 911 immediately for:
- Trouble breathing
- Collapse
- A seizure
- Severe confusion
- An irregular heartbeat
- Difficulty waking the person
Large amounts of doxepin can cause serious heart, nervous-system and breathing problems.
Why 10 mg May Cause More Side Effects
A higher dose can increase doxepin's sedating and anticholinergic effects. Possible side effects include:
- Next-day drowsiness or reduced alertness
- Dizziness or poor coordination
- Confusion or unusual behavior
- Blurred vision
- Dry mouth
- Constipation
- Difficulty urinating
- Low blood pressure
Alcohol, opioids, benzodiazepines, sleep medicines and sedating antihistamines can make these effects stronger.
People with untreated narrow-angle glaucoma, severe urinary retention or severe sleep apnea should get specific medical advice before taking doxepin.
How to Take Doxepin for Insomnia More Safely
If your prescriber has approved doxepin for sleep:
- Take it within 30 minutes of bedtime.
- Take it only when you can stay in bed for 7 to 8 hours.
- Avoid taking it within 3 hours of a meal. Food can increase next-day effects.
- Do not combine it with alcohol unless your clinician says it is safe.
- Do not take a second dose if you remain awake.
- Contact your prescriber if your sleep gets worse or does not improve within 7 to 10 days.
When to Contact Your Prescriber
Ask your prescriber or pharmacist about 10 mg before taking it if:
- The prescription was meant for insomnia but the bottle says 10 mg capsule
- You are age 65 or older
- You have sleep apnea, glaucoma, urinary-retention problems, liver disease or heart problems
- You take antidepressants, opioids, benzodiazepines, antihistamines or other sleep medicines
- You feel excessively sedated or confused the next morning
- You are thinking about increasing your dose because 3 mg or 6 mg is not helping
Bottom line: Do not change your doxepin dose on your own. If you took 10 mg and feel well, contact your pharmacist or prescriber for advice based on your prescription and health history. If you have serious symptoms or took doxepin with other sedatives, contact Poison Help or emergency services immediately.