A nurse is preparing to administer diazepam 2.5 mg PO once a day at bedtime to a client who has anxiety. Available is diazepam oral solution 5 mg/5 mL. How many mL should the nurse administer? (Round the answer to the nearest tenth. Use a leading zero if it applies. Do not use a trailing zero.)

Rationale: How to solve this step by step: Determine the dosage required: 2.5 mg Determine the concentration available: 5 mg/5 mL Simplify the concentration: 5 mg/5 mL=1 mg/mL Use the formula: Volume (mL)=Required dose (mg)/Concentration (mg/mL) Calculate the volume: Volume (mL)=2.5 mg/1 mg/mL Volume (mL)=2.5 mL