Is erythromycin 5 mg per gram equivalent to a 0.5 % (weight‑by‑weight) concentration?

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Last updated: October 28, 2026 • View editorial policy

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Yes — erythromycin 5 mg per gram is exactly the same as 0.5% w/w.

  • Calculation: 0.5% w/w = 0.5 g per 100 g = 500 mg per 100 g = 5 mg per gram.

  • Context check: Ophthalmic erythromycin prophylaxis is commonly labeled as 0.5% ointment, which corresponds to 5 mg/g, consistent with guideline notation for neonatal ocular prophylaxis 1.

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