A client who is taking antibiotics for a sinus infection presents with a white coating on the tongue and complains of a burning sensation on the tongue. which instructions are most appropriate for this client?

The most appropriate instructions is to rinse mouth with antifungal medication as prescribed. This is because the client's symptoms are consistent with oral candidiasis which is common in clients taking antibiotics. The tongue will be further irritated if attempts are made to scrape off the coating or if the mouth is cleaned with peroxide. Since this is caused by antibiotic use, then another antibiotic for the tongue would not be prescribed.