The healthcare provider prescribes streptomycin 200 mg intramuscularly every 12 hours. The vial is labeled, "Streptomycin 1 gram/2.5 mL. How many milliliters should the nurse administer? (Enter numerical value only. (If rounding is required, round to the nearest tenth.)

To find out how many milliliters of streptomycin to administer, you need to use the formula: D/H x Q = X, where D is the desired dose, H is the dose on hand, Q is the quantity on hand, and X is the amount to give. In this case, D = 200 mg, H = 1000 mg, Q = 2.5 mL, and X is unknown. Plug in the values and solve for X: X = (200 mg / 1000 mg) x 2.5 mL X = 0.5 mL Therefore, the nurse should administer 0.5 mL of streptomycin.