A client is ordered Ampicillin 0.25 g PO every 6 hours. The available preparation is ampicillin capsules labeled 250 mg. How many capsules will be administered for a single dose?

Step 1 is to convert the ordered dose from grams (g) to milligrams (mg) to match the available preparation's units: 0.25 g× 1000 mg/g = 250 mg. Step 2 is to determine the number of capsules to administer by dividing the ordered dose by the dose per capsule: 250 mg÷ 250 mg/capsule = 1 capsule. Final calculated answer: 1 capsule.