A nurse is teaching a client who is beginning a course of metronidazole to treat a sexually transmitted infection (STI). Which of the following responses by the nurse should be included in the client education of this medication?

A. Incorrect: Stopping antibiotics early can lead to incomplete eradication of the infection and resistance. B. Correct: Clients should always complete the full prescribed course of antibiotics to ensure the infection is fully treated and to prevent resistance. C. Incorrect: Clients should abstain from sexual activity or use protection to prevent reinfection or transmission of the STI. D. Incorrect: Metronidazole is an antibacterial and antiprotozoal drug, not an antiviral. It does not affect hormonal contraception, but alcohol consumption should be avoided while taking it.