Paroxetine: what it treats, how to take it, side effects
Last updated September 3, 2026.
Paroxetine is an SSRI antidepressant with one of the broadest indication lists in its class. You may know it as Paxil, Pexeva, or Brisdelle. It increases serotonin in the brain, and among the SSRIs it is the one most famous for a hard withdrawal.
What does it treat?
Depression, panic disorder, social anxiety disorder, obsessive-compulsive disorder, generalized anxiety disorder, posttraumatic stress disorder, premenstrual dysphoric disorder, and hot flashes in menopause. MedlinePlus also lists chronic headaches, diabetic nerve tingling and pain, and certain male sexual problems as other uses.
How do you take it?
Once a day, same time every day. Tablets, liquid, and extended-release tablets go down in the morning or evening, with or without food; the capsule is taken at bedtime. Shake the liquid well. Swallow tablets whole - no chewing or crushing. The label starts depression at 20 mg a day, usually in the morning, increasing in 10-mg steps no more than once a week, up to 50 mg; older adults and people with severe kidney or liver impairment start at 10 mg and cap at 40 mg. Full benefit takes several weeks. Do not stop suddenly: withdrawal brings depression, mood changes, irritability, anxiety, confusion, dizziness, headache, tiredness, numbness or tingling in the arms, legs, hands, or feet, unusual dreams, insomnia, nausea, and sweating. Your doctor tapers gradually. Missed dose: take it when you remember unless the next one is close; never double up.
Side effects to know
- Common: dizziness, weakness, uncontrollable shaking, trouble sleeping, nervousness, nausea, diarrhea, constipation, decreased appetite, sexual problems, dry mouth, sweating, and yawning.
- Serious: chest pain, shortness of breath, dizziness, or fainting; seizures; the serotonin-syndrome cluster of agitation, fever, sweating, confusion, fast or irregular heartbeat, severe muscle stiffness or twitching, hallucinations, loss of coordination, nausea, vomiting, or diarrhea; abnormal bleeding or bruising; peeling or blistering skin; headache with unsteadiness and thinking or memory problems; sudden nausea, vomiting, weakness, cramping, bloating, swelling, and confusion; and allergic reactions with facial or throat swelling. Angle-closure glaucoma: eye pain, nausea, colored rings around lights, and eye swelling or redness mean emergency care. The boxed warning covers increased suicidal thoughts and actions in people under 24.
Who should not take it?
Anyone who has taken an MAO inhibitor, thioridazine, or pimozide within the past two weeks. Pregnancy is a headline issue here: MedlinePlus says if you become pregnant while taking paroxetine, call your doctor immediately - plan contraception and pregnancy with your doctor before, not after. Flag glaucoma, seizures, bleeding problems, low sodium, and liver or kidney disease. It can make you drowsy and affect judgment - no driving until you know it. Alcohol worsens its side effects.
When is it an emergency?
Call 911 for seizures, fainting, trouble breathing or swallowing, or facial or throat swelling. The serotonin-syndrome cluster and eye pain with vision changes mean immediate care. Thoughts of harming or killing yourself mean calling your doctor right away - or call or text 988, the Suicide and Crisis Lifeline, any time. For an overdose, call Poison Control at 1-800-222-1222. Pymander's escalation routing is built and tested specifically for this class of decision; see the safety architecture working paper.
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Common questions
Why does paroxetine have such a rough withdrawal?
Its short half-life means levels drop fast between doses and faster when stopped. MedlinePlus's withdrawal list includes depression, mood changes, irritability, anxiety, dizziness, headache, numbness or tingling in the arms and legs, unusual dreams, insomnia, nausea, and sweating. Never stop suddenly, never miss days casually - your doctor tapers the dose gradually when it is time.
Can I take paroxetine while pregnant or trying to conceive?
This needs a doctor conversation before, not after. MedlinePlus says to call your doctor immediately if you become pregnant while taking paroxetine - the strongest pregnancy language among the SSRIs. If pregnancy is possible for you, raise it at the prescribing visit so the plan is deliberate.
How long does paroxetine take to work?
Several weeks or longer for the full benefit, per MedlinePlus, with dose increases no more than once a week per the label. Early jitteriness or nausea in the first week or two is common and usually fades. Judge it at the one-month mark.
Can I drink alcohol while taking paroxetine?
MedlinePlus says to ask your doctor about the safe use of alcohol, because alcohol can make paroxetine's side effects worse - drowsiness, dizziness, and judgment effects stack. The practical advice most clinicians give: skip it, especially early in treatment.
What is the difference between Paxil and Brisdelle?
Same molecule, different jobs. Paxil (and Pexeva) are the paroxetine brands for depression, anxiety, OCD, PTSD, and PMDD. Brisdelle is a lower-dose paroxetine capsule taken at bedtime specifically for menopausal hot flashes. Which one you have determines the dose and timing.
What happens if I miss a dose of paroxetine?
Take it as soon as you remember, unless it is almost time for the next one - then skip it, and never double up. Because of paroxetine's short half-life, even a single missed day can bring on dizziness or electric-tingle feelings in sensitive people, so a fixed daily anchor is worth having.