A nurse is preparing to administer 200 mg of ibuprofen PO to a patient. The available dose is 100 mg per tablet. Using the ratio and proportion method, how many tablets should the nurse administer?

A. Tuberculin syringes lack unit calibrations specific to insulin: Tuberculin syringes are marked in milliliters, not insulin units, which makes them inappropriate for accurate insulin dosing. Using them increases the risk of dosing errors and potential hypoglycemia or hyperglycemia.

B. Tuberculin syringes do not have a needle attached: Tuberculin syringes typically come with a needle or have compatible needles available. Lack of needle is not the main safety concern for insulin administration.

C. Tuberculin syringes can only be used for intramuscular injections: Tuberculin syringes can be used for subcutaneous or intradermal injections; their limitation is not route but the calibration for precise dosing, which is unsuitable for insulin.

D. Tuberculin syringes are too large for insulin administration: Tuberculin syringes are small (1 mL), but size is not the main issue. The critical concern is that they are not calibrated in insulin units, making precise dosing unsafe.

A. 20 mL: Twenty milliliters is equivalent to 4 teaspoons. Administering this amount would double the prescribed dose and could lead to medication overdose and adverse effects.

B. 10 mL: One teaspoon equals 5 mL, so 2 teaspoons equal 10 mL. This conversion is standard in clinical practice and ensures accurate and safe medication dosing.

C. 15 mL: Fifteen milliliters is equivalent to 3 teaspoons. Using this amount would exceed the prescribed dose and increase the risk of medication-related harm.

D. 5 mL: Five milliliters equals 1 teaspoon. Administering this amount would provide only half of the prescribed dose, leading to underdosing and reduced therapeutic effect.