A patient is prescribed 150 mg of a psychotropic medication administered IM every 6 hours. The pharmacy provides you with a vial containing 300 mg/2 mL How many milliliters should you administer per dose?

A. This would provide 300 mg, which is double the prescribed dose. B. This error often occurs if a student divides 150 by 300 but forgets to multiply by the quantity (2 mL). This would only provide 75 mg. C. This value is mathematically unrelated to the variables and would result in an overdose of 450 mg. D. Step 1: Use the formula- Volume to administer (mL) = Desired dose ÷ Concentration. Step 2: Determine the concentration in mg/mL. Concentration = 300 mg ÷ 2 mL = 150 mg/mL. Step 3: Insert known values (Desired dose = 150 mg, Concentration = 150 mg/mL). Volume to administer = 150 ÷ 150= 1 mL.