A nurse is planning discharge teaching for a female client who has a prescription for trimethoprim-sulfamethoxazole (Bactrim). Which of the following information should the nurse include?

A. Incorrect: Trimethoprim-sulfamethoxazole is contraindicated in pregnancy due to the risk of congenital defects. B. Incorrect: Stopping the medication early can lead to antibiotic resistance and incomplete treatment. C. Correct: It is essential to complete the entire course of antibiotics to ensure full eradication of the infection. D. Incorrect: There is no indication to take this medication with an ACE inhibitor, and doing so may increase the risk of hyperkalemia.