The healthcare provider prescribes nystatin oral suspension to treat a client's candidiasis. When administering the nystatin, the nurse tells the client to:

Nystatin is a polyene antifungal agent that binds to ergosterol in the fungal cell membrane, increasing permeability. It is utilized primarily for Candida albicans infections of the oropharyngeal mucosa. Effective treatment requires prolonged topical contact between the suspension and the infected lesions. Systemic absorption of nystatin through the gastrointestinal tract is negligible. A. drink the medication through a straw.: Utilizing a straw bypasses the oral mucosa and prevents the medication from coating the fungal lesions. This reduces the therapeutic efficacy of the drug within the oral cavity. Direct contact with the affected areas is necessary for localized antifungal action. B. swish the medication around in the mouth.: Swishing ensures the medication covers all infected surfaces of the oral mucosa and tongue. The client should swish and swallow or gargle to treat deep oropharyngeal areas effectively. This technique optimizes the duration of contact between nystatin and the fungus. C. dilute the medication with cold water.: Dilution lowers the concentration of the active ingredient, potentially leading to sub-therapeutic dosing and treatment failure. Nystatin should be administered at full strength to maintain the necessary chemical gradient against the fungi. Proper concentration is vital for pharmaceutical integrity. D. brush the teeth after using the medication.: Brushing immediately after administration removes the medication from the oral surfaces before it can exert its effect. The nurse should advise the client to avoid oral intake or hygiene for 30 minutes post-administration. This allows for sufficient mucosal absorption and activity.