A nurse is preparing to administer isoniazid 187 mg IM. Available is isoniazid injection 100 mg/mL. How many mL should the nurse administer? (Round the answer to the nearest tenth. Use a leading zero if it applies. Do not use a trailing zero.)

Determine the desired dosage: The nurse needs to administer 187 mg of isoniazid. Determine the volume per dose: The isoniazid injection contains 100 mg per 1 mL. The nurse needs to administer 187 mg per dose. To find the volume per dose, we can set up a proportion: 100 mg / 1 mL = 187 mg / x mL Cross-multiplying gives us: 100x = 187 Dividing both sides by 100, we get: x = 1.87 mL Round the answer to the nearest tenth: Rounding 1.87 to the nearest tenth gives us 1.9 mL.