Erythromycin estolate or ethylsuccinate, 50 mg/kg per day in four divided doses for 14 days, is curative in about 80% of cases.34 A second course may beMild to moderate infections of the upper and lower respiratory tract, pharyngitis, skin infections: PO 250 mg q6h, 500 mg q12h, or 333 mg q8h....