Do not take Viagra in case you are also taking a nitrate medication for chest ache or heart troubles. This includes nitroglycerin (Nitrostat, Nitrolingual, Nitro-Dur, Nitro-Bid, and others), isosorbide dinitrate (Dilatrate-SR, Isordil, Sorbitrate), and isosorbide mononitrate (Imdur, ISMO, Monoket). Nitrates are additionally present in a great deal of recreational medicine such as amyl nitrate or nitrite ("poppers"). Using Viagra with a nitrate medication can cause a severe lowering in blood pressure, resulting in fainting, stroke, or coronary heart attack. 
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When you have whichever of these conditions, your doctor may have to regulate the <a href="http://phrconline.org">Viagra</a> dose or arrange special exams:

heart illness or heart rhythm problems;

a recent chronicle (in the past six months) of a coronary heart attack, stroke, or heart rhythm dysfunction;

congestive coronary heart failure;

excessive or low blood pressure;

coronary artery illness;

liver or kidney disease;

a blood cell dysfunction like sickle cell anemia, multiple myeloma, or leukemia;

a bleeding dysfunction like hemophilia;

a stomach ulcer;

retinitis pigmentosa (an inherited condition of the eye);

a bodily anomaly of the penis (like Peyronie's illness); or

if in case you have been told you shouldn't have sexual activity for well being factors. 
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Viagra can decrease blood flow to the optic nerve of the eye, causing unexpected vision failure. This has occurred in a minor variety of patients taking Viagra, the greater part of whom additionally had heart illness, diabetic problems, hypertension, excessive ldl cholesterol, or certain pre-existing eye problems, and in those who smoke or are more than fifty years old. It isn't clear whether Viagra is the real reason behind vision loss. 
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Stop using <a href="http://phrconline.org">Viagra</a> and get emergency medical assistance when you have abrupt vision failure.