Paxil vs. Celexa

See how Paxil and Celexa compare on approved uses, dosing, side effects, and cost.

Andre Stone | MD

Medically reviewed by Andre Stone | MD, University of Pittsburgh School of Medicine on September 8th, 2026.

Key Takeaways

  • Both Paxil and Celexa carry a boxed warning about an increased risk of suicidal thoughts and behaviors in pediatric and young adult patients taking antidepressants. Neither medication is FDA-approved for pediatric patients, and people of all ages should be monitored for worsening symptoms or suicidal thoughts after starting treatment or changing the dose.

  • Paxil is FDA-approved for six conditions including OCD, panic disorder, and PTSD, while Celexa is FDA-approved only for major depression in adults.

  • Both medications are generally taken once daily, but their starting doses and dose adjustments depend on the condition, age, other health conditions, and other medications. Paxil is more likely than many SSRIs to cause discontinuation symptoms if it is stopped suddenly, so either medication should be reduced only with guidance from a healthcare professional.

Paxil vs. Celexa Drug Summary

Paxil

Paxil (paroxetine) is an SSRI antidepressant approved for major depression, OCD, panic disorder, social anxiety disorder, generalized anxiety disorder, and PTSD. It comes as an immediate-release tablet, extended-release tablet, or liquid suspension, taken once daily.

Celexa

Celexa (citalopram) is an SSRI antidepressant FDA-approved for major depressive disorder in adults, though it's often prescribed off-label for anxiety-related conditions. It's taken as an oral tablet or solution, once daily.

Paxil vs. Celexa Side Effects

Paxil

Most common
nausea (up to 26%)
somnolence (up to 23%)
dry mouth (up to 18%)
asthenia (up to 15%)

Celexa

Most common
nausea (up to 21%)
somnolence (up to 18%)
dry mouth (up to 20%)
insomnia (up to 15%)

Paxil vs. Celexa Dosage

Paxil

Dosage
Dosage Table
STAGE DOSE WHEN
Starting dose 20 mg once daily At the start
Maximum dose 50 mg once daily If needed
Dose changes 3 increases As tolerated

Celexa

Dosage
Dosage Table
STAGE DOSE WHEN
Starting dose 20 mg once daily Week 1
Maximum dose 40 mg once daily Week 2 onward
Dose changes 1 increase Every week

Paxil vs. Celexa Indications

Paxil

Paxil is FDA-approved for a wide range of conditions beyond depression, including several anxiety disorders and PTSD. It's one of the few SSRIs with this breadth of approved uses, making it a common choice when anxiety and depression overlap.

  • Major depressive disorder

  • Obsessive-compulsive disorder

  • Panic disorder

  • Social anxiety disorder

Celexa

Celexa's FDA approval covers only major depressive disorder in adults. Despite this narrower label, it's frequently prescribed off-label for generalized anxiety, panic disorder, and OCD based on clinical experience.

  • Major depressive disorder (FDA-approved)

  • Generalized anxiety disorder (off-label)

  • Panic disorder (off-label)

  • Obsessive-compulsive disorder (off-label)

Paxil vs. Celexa Pros and Cons

Paxil

Paxil offers the broadest FDA-approved indication list of the two, covering several anxiety disorders alongside depression. Its strong CYP2D6 inhibition means it interacts with many other medications, and its short half-life can make stopping it more uncomfortable.

Pros

  • Approved for six conditions, including OCD, panic disorder, and PTSD

  • Available in extended-release and liquid suspension forms

  • Long clinical track record since 1992 across multiple anxiety disorders

Cons

  • Strong CYP2D6 inhibition can require dose changes to other medications

  • Short half-life often leads to more pronounced discontinuation symptoms

  • Not approved for use in pediatric patients

Celexa

Celexa has a simpler, well-studied dosing regimen and a long safety track record as one of the most widely prescribed SSRIs. Its main clinical limitation is a dose-dependent QT prolongation risk that caps the maximum dose in certain patients.

Pros

  • Well-established long-term safety record as a widely prescribed SSRI

  • Simple two-step dosing with minimal titration

  • Available as an oral solution for those who have trouble swallowing pills

Cons

  • Dose-dependent QT prolongation risk limits the maximum daily dose

  • Lower max dose required in patients over 60, with liver issues, or poor metabolizers

  • Only FDA-approved for adult major depression, so anxiety uses are off-label

Common Symptoms and Related Diseases You Can Explore

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