Escitalopram vs Paroxetine

Both escitalopram and paroxetine are effective for major depressive disorder and generalized anxiety disorder. Paroxetine has FDA approval for a wider range of anxiety disorders including social anxiety disorder, panic disorder, PTSD, and OCD, making it a versatile option for anxiety-predominant presentations.

The Cipriani et al. (2009) network meta-analysis found escitalopram to be among the most effective antidepressants with the best acceptability (fewest dropouts due to side effects). Paroxetine was also rated as effective but had lower acceptability scores.

Paroxetine's strong anticholinergic and antihistaminic properties give it a mildly sedating quality, which may benefit patients with anxiety-related insomnia but can cause excessive daytime drowsiness in others.

Escitalopram is generally better tolerated than paroxetine. Key side effect differences include:

Weight gain: Paroxetine is associated with more weight gain than other SSRIs, including escitalopram. Long-term studies show paroxetine users gain an average of 3-5 pounds more than those on other SSRIs.

Sedation: Paroxetine has mild anticholinergic and antihistaminic activity, causing more drowsiness and dry mouth than escitalopram.

Sexual dysfunction: Both SSRIs cause sexual side effects, but paroxetine has among the highest rates of sexual dysfunction of all antidepressants, while escitalopram has comparatively lower rates.

Discontinuation syndrome: Paroxetine has the shortest half-life of the SSRIs (approximately 21 hours) and is most strongly associated with discontinuation symptoms (dizziness, electric shock sensations, irritability, nausea). Escitalopram has a longer effective half-life and generally milder withdrawal.

Paroxetine is classified as FDA Pregnancy Category D (positive evidence of risk) and should be avoided in pregnancy, particularly during the first trimester.

Both drugs are available as inexpensive generics. Paroxetine has been generic since 2003, and escitalopram since 2012. A 30-day supply of either typically costs $4-$15. Both are widely covered by insurance formularies.

Paroxetine is also available in a controlled-release formulation (Paxil CR) which may cost more but reduces gastrointestinal side effects.

Both are taken once daily. Escitalopram is typically taken in the morning with or without food. Paroxetine is often taken in the morning or at bedtime (bedtime may help if sedation occurs) and is recommended to be taken with food.

A significant practical difference is discontinuation: paroxetine requires more careful, gradual tapering when stopping due to its high risk of withdrawal symptoms. Escitalopram is easier to discontinue.

Escitalopram is generally preferred as a first-line SSRI due to its favorable tolerability profile, fewer side effects, simpler drug interactions, and easier discontinuation. It is a strong choice for depression and generalized anxiety disorder.

Paroxetine may be preferred for specific anxiety disorders where it has the strongest evidence (social anxiety, panic disorder, PTSD, OCD), for patients who benefit from its mild sedating effect, or for those who have previously responded well to it.

Paroxetine should be avoided in pregnancy and used cautiously in patients concerned about weight gain or those likely to need medication changes. Discuss these tradeoffs with your healthcare provider.