A nurse is caring for a client who is postpartum and is experiencing nausea. The nurse plans to administer promethazine 12.5mg PO. Available is promethazine 25mg tablets. How many tablets should the nurse plan to administer? Round the answer to the nearest tenth. Use a leading zero. Do not use a trailing zero.

Given: Prescribed dose: 12.5 mg of promethazine Available tablets: 25 mg tablets Steps to solve: Determine the number of tablets per dose: Find how many 25 mg tablets are needed to make 12.5 mg of promethazine. Set up a proportion to solve for the unknown number of tablets (X): 25 mg/tablet = 12.5 mg/X tablets Cross-multiplying gives us: 25 mg x X tablets = 12.5 mg x 1 tablet Simplifying: 25X = 12.5 Solving for X: X = 12.5 / 25 = 0.5 tablets