
How Sildenafil Citrate Works:
Two chemicals are produced by the male body whilst sexually aroused, Cyclic GMP which causes the muscles in the arterial wall of the penis to relax (thus allowing increased blood flow) and phosphodiesterase type 5 (PDE-5) which decreases erections. Sildenafil is a PDE-5 inhibitor, it causes a vigorous build up of Cyclic GMP causing the penis to stay erect in inhibits the chemical which normally decreases an erection. In order to Sildenafil to work, the man must be sexually stimulated. Sildenafil will not work without sexual stimulation.
DO NOT take sildenafil citrate if you take any medicines that contain nitrates. Nitrates are commonly found in drugs used in treating heart conditions such as Angina. Examples of these are Nitroglycerin, Isosorbide Mononitrate and Isosorbide Dinitrate. Nitrates are also found in Amyl Nitrate ( Poppers), a recreational drug used primarily among younger men. Mixing Sildenafil Citrate with medications that contain nitrates can cause severe drops in blood pressure which can lead to heart attack or stroke.
If you suffer from any of the following medical conditions, talk to your doctor BEFORE taking Sildenafil Citrate:

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