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What are the side effects of Amoxapine?

Updated Sep 7, 20262 min readAnswer
On this pageShort answer Living with amoxapine: what to watch for Common questions Related questions Sources
Short answer

The most common amoxapine side effects are drowsiness, dry mouth, constipation, blurred vision, dizziness when you stand up, and weight gain, and a smaller number of people develop movement problems such as tremor, stiffness, or restlessness.

Amoxapine is a tricyclic-type antidepressant that also blocks dopamine, which is why it can cause movement effects that most other antidepressants do not. Many of the routine effects fade over the first two to four weeks as your body adjusts, and they are often stronger right after a dose increase. Older adults are more sensitive to the confusion, constipation, urinary retention, and blood pressure drops that lead to falls. Taking the dose at bedtime, standing up slowly, drinking water, and adding fiber handle most of the day-to-day problems. Tell your prescriber about any new twitching, muscle stiffness, or repetitive mouth movements, since those need prompt review rather than waiting.

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Living with amoxapine: what to watch for

1Time the dose for sleep:If drowsiness is the main problem, ask your prescriber about taking the full dose at bedtime.
2Stand up slowly:Sit on the edge of the bed for a moment before rising to blunt the drop in blood pressure that causes lightheadedness.
3Report movement changes fast:New tremor, stiffness, pacing you cannot control, or lip and tongue movements need same-week medical review.
4Do not stop abruptly:Stopping suddenly can bring nausea, headache, and trouble sleeping, so taper only with your prescriber's plan.
5Check what you combine it with:Alcohol, sedatives, MAO inhibitors, and other serotonin drugs raise the risk of sedation or serious reactions.
6Watch mood in the first weeks:Ask someone close to you to flag agitation or dark thoughts after starting or changing the dose, and call your clinician if they appear.

Common questions

What are the side effects of Amoxapine?

Amoxapine is a tricyclic-type antidepressant, so the frequent effects are drowsiness, dry mouth, constipation, blurred vision, dizziness on standing, weight gain, and trouble urinating. Most of these ease within the first few weeks. Because amoxapine also blocks dopamine, it can cause movement problems such as tremor, muscle stiffness, inner restlessness, or repetitive face and mouth movements that may persist, so report any new movement changes promptly. Like all antidepressants, it carries a warning about new or worsening suicidal thoughts, especially under age 25. Seek emergency care for high fever with muscle rigidity, a seizure, or a fast or irregular heartbeat.

About this page. Written and maintained by the Pymander Health team. Last updated September 7, 2026.

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