A nurse is teaching a patient about the use of sildenafil (Viagra) for erectile dysfunction. Which statement by the patient indicates understanding of the teaching?

Choice A reason: The statement that sildenafil may cause an erection one week after taking it indicates a misunderstanding of how the medication works. Sildenafil is intended to be taken as needed before sexual activity, usually about 30 minutes to 1 hour beforehand. Its effects typically last for up to four to six hours, not extending to a week. This statement shows a lack of understanding of the medication’s pharmacokinetics and appropriate usage. Choice B reason: Taking sildenafil 1 minute before sexual activity is incorrect. The medication requires time to become effective, generally 30 minutes to 1 hour before sexual activity. This timeframe allows the drug to be absorbed and achieve the desired effect. Administering it just 1 minute before would not allow sufficient time for the medication to work, demonstrating a misunderstanding of its proper usage. Choice C reason: The statement about contacting a provider if an erection lasts longer than 6 hours indicates proper understanding. Prolonged erections, known as priapism, can be a serious side effect of sildenafil. It requires immediate medical attention to prevent permanent damage to the penis. Recognizing this as a potential side effect and knowing to seek help demonstrates a good understanding of the medication’s risks and appropriate action. Choice D reason: Using nitroglycerin with sildenafil is contraindicated due to the risk of severe hypotension. Both medications can lower blood pressure significantly, and their combined effect can lead to dangerous drops in blood pressure, potentially resulting in dizziness, fainting, heart attack, or stroke. This statement indicates a misunderstanding of safe medication practices and the critical interactions between these drugs.