An adult client receives a prescription for diphenhydramine 15 mL by mouth (PO) every 12 hours as needed (PRN) for pruritus. The bottle is labeled, "Diphenhydramine 12.5 mg/5 mL." What is the total daily dose in mg that the client receives? (Enter numerical value only.)

The prescribed dosage is 15 mL every 12 hours, so the total daily dosage in mL would be: Daily dosage in mL = 2 × Dosage per dose = 2 ×15mL = 30mL The medication is available in a concentration of 12.5 mg/5 mL. Therefore, the total daily dosage in mg would be: Daily dosage in mg=Daily dosage in mL×Concentration in mg/mL=30mL×5mL12.5mg​=75mg So, the client receives a total daily dose of 75 mg of diphenhydramine.