A nurse is preparing to administer phenobarbital 3 mg/kg/day PO in two divided doses to a client who weighs 145 lb. The amount available is phenobarbital 100 mg/tablet. How many tablets should the nurse administer per dose? (Round the answer to the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)

Convert pounds to kilograms: Conversion factor: 1 kg = 2.2 lb =145 lb / 2.2 lb/kg = 65.9 kg Calculate the total daily dose: Total daily dose (mg) = Weight (kg) × Dosage (mg/kg/day) = 65.9 kg 3 mg/kg/day = 197.7 mg/day Calculate the dose per administration (divided into two doses): Dose per administration (mg) = Total daily dose (mg) / Number of doses =197.7 mg/day / 2 doses = 98.85 mg/dose Calculate the number of tablets per dose: Number of tablets = Desired dose (mg) / Available dose (mg/tablet) =98.85 mg/dose / 100 mg/tablet = 0.9885 tablets Round to the nearest whole number: 0.9885 tablets is 1 tablet