The order for your patient is 150 mg of ranitidine PO. Your supply on hand is ranitidine 15 mg/mL. How much will you give?

The order for your patient is 150 mg of ranitidine PO. Your supply on hand is ranitidine 15 mg/mL. How much will you give?

• A. 5 mL
• B. 10 mL
• C. 15 mL
• D. 20 mL

Answer: (B)

The concept is converting a prescribed dose into a volume using the drug’s concentration. If 15 mg of ranitidine are present per 1 mL, then each milliliter carries 15 mg. To deliver 150 mg, divide the desired dose by the concentration: 150 mg ÷ 15 mg/mL = 10 mL. So the patient should receive 10 mL by mouth. This uses the straightforward dose-to-volume calculation: volume = dose / (concentration). Always confirm the order and safe administration, but the calculation itself is accurately done as 10 mL.

The concept is converting a prescribed dose into a volume using the drug’s concentration. If 15 mg of ranitidine are present per 1 mL, then each milliliter carries 15 mg. To deliver 150 mg, divide the desired dose by the concentration: 150 mg ÷ 15 mg/mL = 10 mL. So the patient should receive 10 mL by mouth. This uses the straightforward dose-to-volume calculation: volume = dose / (concentration). Always confirm the order and safe administration, but the calculation itself is accurately done as 10 mL.