Viagra is one of the most popular and publicized drugs used to treat male impotence or erectile dysfunction. It is wise, if using this medication, to know how it works and also the precautions or side effects of this drug.  Another consideration when taking Viagra is possible drug interactions.
 Viagra works by helping a male, who has had a problem with impotence, have an erection. To have Viagra be effective, the man must be sexually aroused first. 
There are side effects that any man who is taking Viagra needs to be aware of.  Viagra can cause changes in the retina that can effect the way that we see color.  Another possible side effect of Viagra can be headaches. This is a big reason why so many men seek out alternatives to Viagra. 
 It is important to note that Viagra is a prescription drug with good reason.  It’s necessary for a doctor to know your medical history and current list of drugs you are taking.  Viagra can have a side effect of causing heart attacks and your doctor needs to know if there is a risk of this in each individual patient before prescribing it.
 For men taking nitroglycerin for angina or chest pain, there can be an adverse interaction of Viagra and nitroglycerin together.  This is another good reason Viagra is a prescription medication, so that these potential problems can be assesed before prescribing it for an individual.
 There is also, as a possible side effect, the risk of dependency upon Viagra to achieve an erection. A man who is taking Viagra recreationally and did not need it physically, may suffer from this side effect.  Another possible side effect of Viagra ia a long lasting erection for hours that is painful and this requires medical attention. Viagra alternatives are also popular because of this side effect, because men are afraid of the embarrassment of a nonstop erection and do not want to go to the emergency room with such an odd problem. 
 Not all men who take Viagra will experience any or all of the side effects, but it’s important to be aware of what they are so you can be informed.  Viagra can, if used properly, enhance the quality of life and intimacy and help a man’s self esteem.