Paroxetine
Generic name: paroxetine hydrochloride · Brand name: Paxil® / Paxil CR®
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How It Works
Paroxetine is a selective serotonin reuptake inhibitor (SSRI) with additional anticholinergic and noradrenergic properties. It blocks serotonin reabsorption in the brain and also has mild effects on norepinephrine. This makes it particularly effective for anxiety disorders. Paroxetine has a shorter half-life than other SSRIs and should not be stopped abruptly — it has the highest risk of discontinuation syndrome among SSRIs.
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What It Treats
Major Depressive Disorder (MDD)Persistent low mood, fatigue, loss of interest, sleep and appetite changes
Generalized Anxiety Disorder (GAD)Excessive worry, muscle tension, restlessness
Social Anxiety DisorderFear of social situations, avoidance, physical anxiety symptoms
PTSDFDA-approved; helps reduce re-experiencing, avoidance, and hyperarousal
OCD & Panic DisorderFDA-approved for both conditions
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Dosing Overview
| Population | Start | Typical Range | Max |
|---|---|---|---|
| Adults Depression | 20 mg | 20–40 mg | 60 mg |
| Adults Anxiety / GAD | 20 mg | 20–50 mg | 60 mg |
| Adults Social Anxiety | 20 mg | 20–60 mg | 60 mg |
| Adults PTSD | 20 mg | 20–50 mg | 60 mg |
Taken once daily, usually in the morning. Paxil CR (controlled release) may cause less nausea. Do NOT stop abruptly — must taper slowly to avoid discontinuation syndrome.
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What to Expect — Timeline
1–2
Weeks 1–2
Body adjusting. May notice sleep changes, mild nausea, or fatigue before mood lifts
3–4
Weeks 3–4
Many notice improved sleep, energy, or motivation. Anxiety may still feel elevated
6–8
Weeks 6–8
Mood and anxiety typically improve significantly at a therapeutic dose
3–6m
3–6 Months
Full therapeutic benefit. Duration discussed based on your history and goals
⏳ Be patient. Most people need at least 4–8 weeks at a therapeutic dose before evaluating effectiveness. Do not stop without talking to your provider.
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Side Effects
Common (often temporary)
- Nausea or upset stomach
- Drowsiness or fatigue
- Dry mouth
- Constipation
- Increased sweating
- Weight gain (more common than other SSRIs)
- Sexual side effects
- Blurred vision
Call us if you notice
- Worsening depression or anxiety
- New or increased suicidal thoughts
- Agitation or restlessness
- Unusual bleeding
- Hypomania or mania-like symptoms
- Serotonin syndrome signs (fever, confusion, tremor)
Paroxetine has more side effects than some SSRIs, including more weight gain and sedation. It also has the highest risk of discontinuation syndrome — never stop without a taper plan. Sexual side effects are among the most common complaints.
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Tips for Success
Same Time DailyTake at the same time each day for consistent levels in your system.
With FoodTaking with food can reduce nausea, especially in the first weeks.
Don't Stop AbruptlyStopping suddenly can cause dizziness and mood changes. Always taper with guidance.
Limit AlcoholAlcohol worsens depression and anxiety and may increase side effects.
Tell All ProvidersLet other prescribers know you take this medication — interactions matter.
Track Your MoodJournaling or a mood app helps you and your provider see what is changing.
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Important Safety Information
Black Box Warning (under 25): Antidepressants may increase risk of suicidal thinking in children, adolescents, and young adults, especially in the first few weeks. Monitor closely and contact us right away if new or worsening thoughts of self-harm appear.
Serotonin Syndrome: A rare but serious reaction when combined with MAOIs, triptans, tramadol, or St. John's Wort. Signs include fever, agitation, rapid heart rate, muscle twitching, or confusion — seek emergency care immediately.
Drug Interactions: Do not take with MAOIs (must wait 14 days between). Use caution with blood thinners and NSAIDs. Always share your full medication list with your provider.
Pregnancy & Breastfeeding: Discuss risks and benefits with your provider. Do not stop without consultation.
Discontinuation Syndrome: Paroxetine has the highest risk of withdrawal symptoms of all SSRIs — dizziness, "brain zaps," flu-like symptoms, and mood changes. Never stop without a slow taper plan from your provider.
Questions? I'm here.
Reach me between appointments if you have concerns about side effects, notice mood changes, or have questions about your medication. You don't have to wait until your next visit.
360-389-3712
info@rootedmindspsychiatry.com