How should I dose paroxetine oral suspension (10 mg per 5 mL) to administer a 5 mg dose?

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Last updated: October 8, 2026 • View editorial policy

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Dosing Paroxetine 10mg/5mL Oral Suspension to Deliver 5mg

To administer a 5mg dose from paroxetine oral suspension (10mg per 5mL), measure and give 2.5mL of the suspension.

Calculation

The concentration is 10mg per 5mL, which equals 2mg per 1mL.

  • For 5mg dose: 5mg ÷ 2mg/mL = 2.5mL

Practical Administration

  • Use an oral syringe or dosing cup marked in milliliters for accurate measurement
  • The oral suspension formulation is bioequivalent to tablets 1, so this liquid dose will provide the same drug exposure as a 5mg tablet would
  • According to the FDA label, the suspension contains 10mg paroxetine per 5mL and is an orange-colored, orange-flavored liquid 2

Clinical Context

The 5mg dose represents a subtherapeutic "test" dose that may be appropriate when:

  • Initiating therapy in patients who may be sensitive to side effects 3
  • Tapering off paroxetine treatment to minimize discontinuation syndrome 1
  • Adjusting doses in patients requiring CYP2D6 inhibition at lower levels 4

Note that standard therapeutic dosing for depression and anxiety disorders typically starts at 10-20mg daily, with the oral suspension providing flexibility for dose adjustments in 2.5mg or 5mg increments 2, 5.

References

1
Research

Paroxetine oral solution is bioequivalent to paroxetine tablets--advantages of the solution.

International journal of clinical pharmacology and therapeutics, 2007

3
Guideline

clinical practice guideline for the assessment and treatment of children and adolescents with anxiety disorders.

Journal of the American Academy of Child and Adolescent Psychiatry, 2020

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This information is intended for healthcare professionals. Any medical decision-making should rely on clinical judgment and independently verified information. The content provided herein does not replace professional discretion and should be considered supplementary to established clinical guidelines. Healthcare providers should verify all information against primary literature and current practice standards before application in patient care. Dr.Oracle assumes no liability for clinical decisions based on this content.