Celexa vs. Remeron

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

Key Takeaways

  • Celexa is an SSRI often chosen for depression and anxiety, while Remeron's strong sedative effect makes it a common pick when insomnia is also a problem.

  • Remeron causes drowsiness in more than half of patients, compared to about 18% with Celexa, so the two drugs suit very different daily routines.

  • Both carry a boxed warning for suicidal thinking in children and young adults and are not approved for use in children.

Celexa vs. Remeron Drug Summary

Celexa

Celexa (citalopram) is a selective serotonin reuptake inhibitor (SSRI) approved for major depressive disorder in adults. It's taken once daily as a tablet or oral solution, typically starting at 20 mg and increasing to 40 mg after one week.

Remeron

Remeron (mirtazapine) is a tetracyclic antidepressant approved for major depressive disorder in adults. It's taken once daily, usually at bedtime, starting at 15 mg and titrating up to a maintenance dose of 45 mg.

Celexa vs. Remeron Side Effects

Celexa

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

Remeron

Most common
dry mouth (up to 25%)
somnolence (up to 54%)
increased appetite (up to 17%)
constipation (up to 13%)

Celexa vs. Remeron Dosage

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

Remeron

Dosage
Dosage Table
STAGE DOSE WHEN
Starting dose 15 mg once daily At the start
Maximum dose 45 mg once daily If needed
Dose changes 2 increases As tolerated

Celexa vs. Remeron Indications

Celexa

Celexa is FDA-approved to treat major depressive disorder in adults. Doctors also prescribe it off-label for generalized anxiety disorder, panic disorder, and OCD, given its predictable dosing and long track record.

  • Major depressive disorder (MDD) in adults

  • Off-label: generalized anxiety disorder

  • Off-label: panic disorder

  • Off-label: obsessive-compulsive disorder (OCD)

Remeron

Remeron is FDA-approved to treat major depressive disorder in adults. Its sedating and appetite-stimulating effects lead doctors to prescribe it off-label for insomnia, anxiety, and appetite loss in cancer or elderly patients.

  • Major depressive disorder (MDD) in adults

  • Off-label: insomnia

  • Off-label: anxiety disorders

  • Off-label: appetite stimulation

Celexa vs. Remeron Pros and Cons

Celexa

Celexa has a long safety record as one of the most widely prescribed SSRIs, with less sedation than Remeron for people who need to stay alert during the day. Its main clinical caution is dose-dependent QT prolongation, which caps the dose at 40 mg and lowers it further in older adults.

Pros

  • Long-established safety record as a widely used SSRI

  • Lower sedation, easier to take during the day

  • Available as tablet or oral solution for flexible dosing

  • Simple two-step titration schedule

Cons

  • Dose capped at 40 mg/day due to QT prolongation risk

  • Lower starting dose required in patients over 60

  • Not particularly helpful for insomnia or low appetite

  • Can cause insomnia and increased sweating in some patients

Remeron

Remeron's strong sedative and appetite-stimulating effects make it useful for depressed patients who also have insomnia or poor appetite. The tradeoff is significant weight gain and daytime drowsiness, plus a rare risk of severe neutropenia that requires monitoring.

Pros

  • Strong sedative effect can improve sleep quickly

  • Stimulates appetite, useful for underweight patients

  • Available as an orally disintegrating tablet (SolTab)

  • Sedation often lessens as the dose is increased

Cons

  • Significant weight gain is common with long-term use

  • More than half of patients experience daytime drowsiness

  • Rare but serious risk of severe neutropenia/agranulocytosis

  • Not ideal for patients needing daytime alertness

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