Ampicillin 250 mg IV every 6 hours; stock is 1000 mg/50 mL. How many mL are needed for a 125 mg dose?

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Study for the Archer Pharmacology Test to master dosage calculations and medication administration. Use flashcards and multiple choice questions with detailed explanations. Get ready for your exam!

Multiple Choice

Ampicillin 250 mg IV every 6 hours; stock is 1000 mg/50 mL. How many mL are needed for a 125 mg dose?

Explanation:
Think in terms of concentration and volume. The stock solution has 1000 mg in 50 mL, which is 1000 ÷ 50 = 20 mg per mL. To deliver 125 mg, use the volume that provides that amount: 125 mg ÷ 20 mg/mL = 6.25 mL. You can also see this with a cross‑multiply setup: 125 mg corresponds to x mL, and 1000 mg corresponds to 50 mL, so x = (125 × 50) / 1000 = 6.25 mL. So you would administer 6.25 mL of the stock solution to give a 125 mg dose.

Think in terms of concentration and volume. The stock solution has 1000 mg in 50 mL, which is 1000 ÷ 50 = 20 mg per mL. To deliver 125 mg, use the volume that provides that amount: 125 mg ÷ 20 mg/mL = 6.25 mL. You can also see this with a cross‑multiply setup: 125 mg corresponds to x mL, and 1000 mg corresponds to 50 mL, so x = (125 × 50) / 1000 = 6.25 mL. So you would administer 6.25 mL of the stock solution to give a 125 mg dose.

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