Just about anyone that is on medication, especially nitroglycerin, for conditions such as angina will probably have problems if they were to take Viagra.
Of course there are side effects for just about every single drug that has ever been prescribed and the same holds true with Viagra. Viagra blocks PDE5 which is an enzyme that breaks down cGMP while a male has an erection causing the penis to again become limp. The problem is that is also has an effect on the PDE6 which is used in certain cells within the retina. The end result is that some will suffer from problems with color vision; basically this means that colors such as blue and green might be altered or everything that they look at will have a blue hue to it. This is not permanent but could last for several hours. Twelve hours prior to a flight, any pilot is banned from taking Viagra for that very reason.
Anyone that is on medication, especially nitroglycerin, for conditions such as angina will likely have problems if they were to take Viagra. Nitroglycerin's purpose is to open the arteries of the heart and supply them with oxygen. Together, Viagra and nitroglycerin can be a dangerous mix. Some men that take Viagra will find that they experience painful headaches. This is because there is an ingredient in Viagra that opens up the arteries in the brain lining and can cause pressure. Another side effect and actually the most dangerous is the risk of having a heart attack. This possibility is the biggest factor in why you are unable to purchase Viagra over the counter. A physician must know your medical history before he can ensure that there is no danger in your taking this drug. In the rare event of an erection lasting more than 4 hours, seek immediate medical help to avoid long-term injury.
It is very important to understand what Viagra is intended for. It is not to be used as a recreational drug as it is possible to end up dependant on the drug and would then not be able to get or maintain an erection without taking Viagra. Some of the other side effects include flushing, nasal congestion, urinary tract infections, diarrhea, rash, dizziness, and dyspepsia. While these side effects are only present with a very small number of people who take Viagra, they are still possibilities. Viagra is completely safe when it is taken by prescription only through a doctor.
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