Author Question: Which are contraindications for taking sildenafil (Viagra)? (Select all that apply.) a. Patients ... (Read 58 times)

jace · **on:** Jul 23, 2018

Which are contraindications for taking sildenafil (Viagra)? (Select all that apply.)

a. Patients who are taking nitroglycerin for angina pectoris
b. Patients with nonarteritic ischemic optic neuropathy (NAION) in one eye
c. Patients with BPH who are taking alpha1-adrenergic antagonists
d. Patients with a blood pressure of 100/60 mm Hg
e. Patients with a history of myocardial infarction (MI) in the past 6 months

Question 2

Tadalafil (Cialis) was prescribed 4 weeks ago for a patient with erectile dysfunction. The patient also takes prazosin (Minipress) for hypertension. Which statement by the patient best demonstrates understanding of the use of tadalafil (Cialis)?

a. I can take this up to 2 times a day, just before intercourse.
b. I have a little renal trouble, so I should take a higher dose.
c. I should take this medication with food.
d. I should take this medication no more than once a day.

nixon_s · **Reply #1 on:** Jul 23, 2018

Answer to Question 1

ANS: A, B, C
Men who take nitroglycerin should not take sildenafil, because at least 24 hours should elapse between taking nitroglycerin and taking sildenafil. Because sildenafil is associated with the development of NAION, patients with that disorder in one eye should not take sildenafil. Patients with low blood pressure should use caution in taking sildenafil, but it is not contraindicated. Patients who have had an MI in the past 6 months should use caution in taking sildenafil.

Answer to Question 2

ANS: D
Tadalafil should be taken no more than once a day and without regard to meals. Tadalafil has a half-life of 17.5 hours and should not be taken twice a day. Men with moderate renal or hepatic insufficiency should take a reduced dosage. This patient may be confusing the actions of tadalafil and prazosin.