A prescription is written for morphine sulfate gr 1/6 IM, q3-4h prn. The label on the vial states "morphine sulfate 10 mg/mL". How many mL should be administered every 3 to 4 hours as needed?

0.5 mL
0.75 mL
1 mL
1.5 mL


1 mL

Rationale: First, convert grains into milligrams. Multiply as follows: gr 1/6 x 60 = 10 mg. Then use this formula: D / H x Q = 10 mg / 10 mg x 1 mL = 1 mL. So, 1 mL should be administered every 3 to 4 hours as needed.

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