You should not take Viagra if you have been instructed by your doctor not to engage in sexual activity due to heart disease or other heart problems. Viagra must never be used by men who are taking medicines that contain nitrates of any kind. If you take Viagra with any nitrate medicine your blood pressure could suddenly drop to an unsafe or life-threatening level. canadian generic viagra Erectile dysfunction is a condition where the penis does not harden and expand when a man is sexually excited, or when he cannot keep an erection. When a man is sexually stimulated, his body's normal response is to increase blood flow to his penis to produce an erection. By controlling the enzyme, sildenafil helps to maintain an erection after the penis is stroked. Without physical action to the penis, such as that occurring during sexual intercourse, sildenafil will not work to cause an erection.
Benign Prostatic Hyperplasia and Erectile Dysfunction/Benign Prostatic Hyperplasia
Very common (10% or more): Flushing (11%) viagra alternatives Shortness of breath Endpoint [Change from baseline] 19% [4%] 41% [23%] <.001Do not use Levitra in patients with severe hepatic impairment (Child-Pugh C). Vardenafil has not been evaluated in this patient population.
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