How many milliliters of an amoxicillin suspension (125 mg per 5 mL) are required to deliver a 125 mg dose?

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Last updated: March 14, 2026 • View editorial policy

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Dosing Calculation for Amoxicillin Suspension

For a 125 mg dose using amoxicillin suspension 125 mg/5 mL, you need to administer 5 mL.

Direct Answer from FDA Labeling

The calculation is straightforward based on the concentration:

  • Amoxicillin suspension 125 mg/5 mL means that each 5 mL contains exactly 125 mg of amoxicillin 1
  • To deliver a 125 mg dose, administer 5 mL of the suspension 1

Practical Administration Details

Preparation and measurement:

  • The reconstituted suspension provides a final concentration of 6 mg/mL when properly mixed 1
  • For the 125 mg/5 mL formulation, a 30 mg dose requires 5 mL, a 45 mg dose requires 7.5 mL, a 60 mg dose requires 10 mL, and a 75 mg dose requires 12.5 mL 1
  • The suspension should be shaken well before each use 1

Storage considerations:

  • After reconstitution, the suspension must be discarded after 14 days 1
  • Refrigeration is preferable but not required 1
  • The suspension should be kept in a tightly closed bottle 1

Common Pitfall to Avoid

Do not confuse the 125 mg/5 mL concentration with the 250 mg/5 mL concentration, as both are available formulations 1. Always verify which concentration you have dispensed before calculating the volume to administer.

Professional Medical Disclaimer

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.