What Is Paxil? Uses, Dosage, and What You Need to Know in 2026

Paxil is one of the most prescribed antidepressants in the United States. Whether you've just been prescribed it or you're trying to understand what it does, this guide covers everything you need to know about Paxil (paroxetine) in plain language.

What Is Paxil?

Paxil is a brand name for paroxetine hydrochloride, a prescription medication classified as a selective serotonin reuptake inhibitor (SSRI). SSRIs are the most commonly prescribed class of antidepressants. Paxil was first approved by the FDA in 1992 and made by GlaxoSmithKline (GSK). Today, it is primarily used in its generic form (paroxetine) by most patients, as it contains the same active ingredient at a fraction of the cost.

What Does Paxil Treat?

Paxil is FDA-approved to treat a wide range of conditions in adults:

Major Depressive Disorder (MDD): Persistent depression significantly affecting daily life.

Obsessive-Compulsive Disorder (OCD): Unwanted recurring thoughts and repetitive behaviors.

Panic Disorder: Recurrent, unexpected panic attacks with fear of future attacks.

Social Anxiety Disorder (SAD): Intense, persistent fear of social or performance situations.

Post-Traumatic Stress Disorder (PTSD): Ongoing trauma-related symptoms after a traumatic event.

Generalized Anxiety Disorder (GAD): Chronic, excessive worry about multiple aspects of daily life.

Premenstrual Dysphoric Disorder (PMDD): Severe emotional and physical symptoms before menstruation (Paxil CR approved for this).

Menopausal hot flashes: Low-dose paroxetine (Brisdelle, 7.5 mg) is approved for moderate-to-severe vasomotor symptoms associated with menopause.

What Forms Does Paxil Come In?

Paroxetine is available in several formulations:

Immediate-release (IR) tablets: 10 mg, 20 mg, 30 mg, and 40 mg. Most widely available and least expensive formulation.

Controlled-release (CR) tablets (Paxil CR): 12.5 mg, 25 mg, and 37.5 mg. Releases over 4–5 hours; less nausea at initiation. More expensive than IR.

Oral suspension: 10 mg/5 mL. Used when tablets are not tolerated; limited availability.

Brisdelle capsules: 7.5 mg paroxetine mesylate. Used specifically for menopausal hot flashes.

Typical Dosages

Dosing varies by condition. For most conditions using the immediate-release tablet, treatment starts at 20 mg once daily. Your doctor may gradually increase by 10 mg per week based on response and tolerability. Typical doses by condition:

Depression: 20–50 mg/day (max 50 mg)

OCD: 40 mg/day recommended (max 60 mg)

Panic disorder: 40 mg/day recommended (max 60 mg)

Social anxiety disorder: 20 mg/day (max 60 mg)

PTSD: 20 mg/day (max 50 mg)

GAD: 20 mg/day (max 50 mg)

Elderly patients: Start at 10 mg/day (max 40 mg)

How Long Does It Take to Work?

Most patients notice some improvements in sleep, energy, and appetite within 1–2 weeks of starting paroxetine. However, full antidepressant effects — particularly for depression — may take 8–12 weeks. For anxiety disorders, patients often notice improvement within 2–4 weeks. Don't give up on paroxetine after just one or two weeks if you haven't noticed a full response yet.

Key Safety Points

Never stop abruptly. Discontinuation syndrome can begin within 24–48 hours. Always taper under your doctor's guidance.

Not for pregnancy. Paroxetine is FDA Category D due to cardiovascular fetal risks. Discuss alternatives with your doctor if pregnant or planning pregnancy.

Drug interactions are significant. Tell your doctor and pharmacist all medications you take — paroxetine strongly inhibits CYP2D6 and can raise levels of many other drugs.

How Much Does Paxil Cost?

Generic paroxetine IR is one of the most affordable medications available — as low as $4/month with GoodRx or SingleCare discount programs at pharmacies like Walmart. Brand-name Paxil without insurance can cost $342–$760+ per month depending on the strength. For a complete breakdown, see our Paxil savings guide.

Finding Paxil at a Pharmacy Near You

While generic paroxetine IR is widely available, Paxil CR and the oral suspension may be harder to find at certain pharmacies. If you're having trouble filling your prescription, medfinder can call pharmacies near you to find which ones have it in stock.