A client receives a new prescription for sildenafil. Which instruction should the practical nurse (PN) reinforce with the client?

A. Do not take on an empty stomach as this can delay the desired effect: Food, not empty stomach, can delay sildenafil absorption; this statement is incorrect. B. Repeat the dose every 30 min up to 3 doses to achieve the desired effect: Dangerous and could cause severe hypotension; sildenafil is taken once before anticipated sexual activity. C. Notify your healthcare provider immediately if vision or hearing loss occur: Vision or hearing changes are serious adverse effects that require immediate medical attention. D. Keep nitroglycerin tablets near in the event chest pain occurs during intercourse: Sildenafil and nitrates can cause life-threatening hypotension; this is unsafe.