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

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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.

Which Are Contraindications for Taking Sildenafil [Viagra]? (Select All That