Erythromycin suspension 200 mg q6h is ordered for a 4-year-old child who weighs 16 kg. the usual pediatric dose is 30 to 50 mg/kg/24 h.

The child weighs is 16 kg and the usual pediatric dose is 30 to 50 mg/kg/24 h. Then the daily dose would be: 30-50 mg/kg/24 h.  * 16kg= 480-800 mg /24hr.

Erythromycin suspension is given q6h, so you need to divide it by 4, then dose per administration would be: 480-800 mg /24hr / (4times/24hr)= 120-200/times

They are all in a iving organism.