What is the recommended dose and administration route for the live attenuated measles‑mumps‑rubella (MMR) vaccine (0.5 mL subcutaneously, containing 1,000–12,500 TCID₅₀)?

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Last updated: October 6, 2026 • View editorial policy

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MMR (live attenuated) dosing and route

Give 0.5 mL per dose subcutaneously; routine schedule is 2 doses at 12–15 months and 4–6 years, with doses ≥28 days apart if accelerated. 1, 2, 3

  • Product/route

    • Live attenuated MMR (e.g., M-M-R II or PRIORIX), reconstituted, administered subcutaneously; either brand is interchangeable. 2, 3
    • FDA label also permits IM or SC for M-M-R II; SC remains ACIP routine route. 1, 2

  • Dose

    • Single dose ≈ 0.5 mL. 1

  • Routine schedule (prioritizes morbidity, mortality, QoL by ensuring immunity)

    • Children: 1st dose at 12–15 months; 2nd dose at 4–6 years. Minimum interval between doses: 28 days if given earlier. 1, 2, 3
    • Catch-up (≥12 months): give 2 doses ≥28 days apart. 2, 3

  • Special situations (to reduce severe outcomes/outbreak risk)

    • International travel or outbreaks:
      • Infants 6–11 months: 1 dose (not counted toward routine series); then 2-dose routine series after 12 months. 2
      • Unvaccinated ≥12 months: 2 doses ≥28 days apart. 2
    • Post-exposure measles: 1 dose within 72 hours. 1, 2

  • Administration/handling pitfalls to avoid

    • Reconstitute with supplied diluent; protect from light; use within 8 hours if refrigerated (2–8°C); discard if discolored/particulate. 1
    • Do not coadminister immune globulins or blood products concurrently; separate live vaccines not given same day by ≥4 weeks. 1, 2, 3
    • Contraindications: pregnancy, severe immunosuppression, severe allergy to components (e.g., gelatin, neomycin). 1

References

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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.