The healthcare provider (HCP) prescribes diazepam 8 mg IM every 4 hours PRN for muscle spasms for a client with a fractured femur. The available vial is labeled "Diazepam Injection, USP 10 mg/2 mL." How many mL should the nurse administer to the client? (Enter numerical value only. If rounding is required, round to the nearest tenth.)

Calculations Step 1: Identify the prescribed dose. Prescribed dose = 8 mg Step 2: Identify the concentration of the vial. Concentration = 10 mg per 2 mL Step 3: Calculate the mL per mg. 2 mL ÷ 10 mg = 0.2 mL per 1 mg Step 4: Calculate the required volume to administer. 8 mg × 0.2 mL/mg = 1.6 mL Result The nurse should administer 1.6 mL to the client.