Sildenafil vs. Tadalafil vs. Vardenafil (Which Is Best?)

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4.1 Nitrates. Consistent with its known effects on the nitric oxide/cGMP pathway [see Clinical Pharmacology (12.1, 12.2)], sildenafil citrate was shown to potentiate the hypotensive effects of nitrates, and its administration to patients who are using nitric oxide donors such as organic nitrates or organic nitrites in any form either regularly and/or intermittently is therefore contraindicated.

Viagra has an average rating of 8.5 out of 10 from a total of 255 ratings on Drugs.com. 83% of reviewers reported a positive effect, while 9% reported a negative effect. Cialis has an average rating of 8.5 out of 10 from a total of 548 ratings on Drugs.com. 83% of reviewers reported a positive effect, while 9% reported a negative effect. Viagra can help men with erectile dysfunction (ED) get and maintain an erection, but there are side effects. Learn more about Viagra s effects on the body. buy echeck viagra canada The four main medicines taken by mouth for erectile dysfunction are: Avanafil (Stendra). Sildenafil (Viagra). Tadalafil (Cialis). Vardenafil. These medicines are called PDE5 inhibitors. Cialis is an oral tablet that starts to work about 30 minutes after you take it. It can improve erectile function for up to 36 hours. The starting daily dose range is 2.5 to 5 milligrams (mg) but Sildenafil (Viagra) is used to treat erectile dysfunction (impotence; inability to get or keep an erection) in men. Sildenafil (Liqrev, Revatio) is used to improve the ability to exercise in adults (Liqrev, Revatio) and children 1 year of age and older (Revatio) with pulmonary arterial hypertension (PAH; high blood pressure in the vessels carrying blood to the lungs, causing shortness of