What dose of Depo‑Medrol (methylprednisolone acetate) is equivalent to 40 mg of Kenalog (triamcinolone acetonide)?

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Last updated: May 27, 2026 • View editorial policy

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Depo-Medrol Dose Equivalent to 40 mg Kenalog

For intra-articular or soft tissue injection, 60 mg of Depo-Medrol (methylprednisolone acetate) is approximately equivalent to 40 mg of Kenalog (triamcinolone acetonide).

Dosing Equivalency

The standard conversion ratio between these two depot corticosteroid preparations is approximately 1.5:1 (methylprednisolone to triamcinolone). This means:

  • 40 mg triamcinolone acetonide ≈ 60 mg methylprednisolone acetate

This equivalency is supported by clinical practice patterns and comparative studies. In frozen shoulder treatment, a study directly compared 40 mg triamcinolone acetonide with 60 mg methylprednisolone acetate and found them equally effective (81.8% vs 83.3% improvement in primary frozen shoulder) 1. Similarly, in shoulder calcific tendonitis treatment, 40 mg of triamcinolone was compared with methylprednisolone (though the exact methylprednisolone dose wasn't specified in the abstract, the study treated them as comparable) 2.

Clinical Context

Both medications are FDA-approved depot corticosteroid formulations available in similar concentrations 3, 4:

  • Depo-Medrol: Available as 40 mg/mL and 80 mg/mL
  • Kenalog-40: Available as 40 mg/mL

Important Considerations:

Potency differences exist between these agents:

  • Triamcinolone acetonide may provide superior outcomes in certain conditions. For diabetic frozen shoulder, triamcinolone showed significantly better improvement (69% vs 39%) and required fewer injections 1.
  • In shoulder calcific tendonitis, triamcinolone had a 5× higher chance of achieving complete functional recovery compared to methylprednisolone 2.

Duration of action:

  • Both are depot formulations designed for sustained release
  • Clinical effects typically last 3-6 weeks for intra-articular injections

Common pitfall: Don't confuse these depot formulations with oral or IV corticosteroid equivalencies. The 1.5:1 ratio applies specifically to depot injectable formulations, not systemic administration where different conversion factors apply (oral methylprednisolone and oral prednisolone are roughly 1:1.25).

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.