Mary, who weighs 16 kg, is to have 1.5 mg/kg of pethidine. Stock is 100 mg/2 ml, so the volume to be drawn up in an 0.5 insulin syringe would be

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First, calculate the total dose of pethidine for Mary: 1.5 mg/kg * 16 kg = 24 mg. Since the stock solution is 100 mg in 2 ml, for every 1 mg of pethidine, 0.02 ml of the solution is needed (2 ml / 100 mg). Therefore, for 24 mg, the volume required is 24 mg * 0.02 ml/mg = 0.48 ml.

Mary, Who Weighs 16 Kg, Is to Have 1