Antidepressant side effects vary by medication and individual. Antidepressant side effects mostly mild and transient but some require attention. This guide covers common patterns.
Common transient side effects
Often improve in 2-4 weeks:
- Nausea, GI upset
- Headache
- Sleep disturbance (initial)
- Fatigue or activation
- Dry mouth
- Dizziness
- Initial anxiety increase
Persistent side effects
May persist:
- Sexual dysfunction (very common, often persists)
- Weight changes (varies by drug)
- Emotional blunting
- Sweating
- Sleep disturbance
Serious side effects
Rare but warrant attention:
- Increased suicidal thoughts (especially young adults; black box warning)
- Serotonin syndrome (with combinations)
- Hyponatremia (low sodium, especially elderly)
- Bleeding risk increase
- QT prolongation (some)
- Manic switch in undiagnosed bipolar
Sexual side effects
Most common persistent side effect:
- Decreased libido
- Difficulty with arousal/orgasm
- Erectile dysfunction
- Often doesn’t fully improve
- Some medications less affected (bupropion, mirtazapine)
- PSSD (post-SSRI sexual dysfunction) — rare reports of persistence after stopping
Weight effects
Varies:
- Weight gain: paroxetine, mirtazapine often most
- Weight neutral: sertraline, escitalopram (varies by patient)
- Weight loss possible: bupropion, fluoxetine initially
When to call provider
- Suicidal thoughts (especially new or worsening)
- Severe agitation
- Manic symptoms
- Severe rash or allergic reactions
- Symptoms of serotonin syndrome
- Side effects affecting daily function
Managing side effects
- Time often resolves transient effects
- Dose adjustment
- Switch medication
- Add adjunct (e.g., bupropion for sexual side effects)
- Timing changes (morning vs evening)
- Take with food for GI symptoms
Frequently Asked Questions
Will side effects go away?
Many transient ones yes (2-4 weeks). Sexual and some others persist.
Should I stop if side effects bad?
Don’t stop without provider. Gradual taper if needed.
Are there antidepressants without side effects?
All have some. Profile varies. Some patients tolerate certain drugs much better.
Is suicidal thinking really increased?
Small absolute increase in young adults. Most patients have decreased suicidal thoughts overall.
Can I prevent weight gain?
Choose weight-neutral medications. Lifestyle interventions.
The bottom line on antidepressant side effects
Most mild and transient. Some persist. Discuss with prescriber. Don’t suffer significant side effects when alternatives exist.