The physician orders Phenergan 12.5mg supp rectally NOW for nausea and vomiting. Available is Phenergan 25mg supp. How many suppositories will the nurse administer?

Rationale: To calculate the correct dose: Ordered dose: 12.5 mg Available dose: 25 mg per suppository Calculation: 12.5 mg ÷ 25 mg = 0.5 suppository The nurse will administer 0.5 suppository rectally.