A Nurse Is Teaching a Patient About the Use of Sildenafil

Multiple Choice

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?

A) "If my erection lasts longer than 4 hours, I should contact my provider."
B) "I should not use nitroglycerin within 12 hours of using sildenafil."
C) "I should take this drug about 15 minutes before sexual activity."
D) "This drug may cause me to have an erection when I don't want one."