Erythromycin levels in serum during treatment with erythromycin stearate and base.

The serum concentrations of erythromycin during treatment with erythromycin stearate and erythromycin base were compared in a randomised cross-over study with 21 hospital patients. No statistically significant differences between the brands were found in the serum erythromycin levels at any time or in the areas under the serum level-time curve.