A nurse is preparing to administer sumatriptan 6 mg subcutaneous to a client. Available is sumatriptan injection 6 mg/0.5 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.)

Calculation: Desired dose = 6 mg. Available concentration = 6 mg / 0.5 mL. Calculate the volume to administer. Volume (mL) = Desired dose (mg) / Available concentration (mg/mL) = 6 mg / (6 mg / 0.5 mL) = 6 mg × (0.5 mL / 6 mg) = (6 × 0.5) / 6 mL = 3 / 6 mL = 0.5 mL. Rounded to the nearest tenth: 0.5.