Before taking Viagra, you should ensure that you do not suffer from any health problems or medical conditions such as diabetes, kidney problems, liver problems, leukaemia, stomach ulcer, sickle cell anaemia, colour vision problems, or a deformity of your penis. If you suffer from any of these conditions, it is essential that your doctor know about it. When you buy Viagra online, make sure that you make it a point to mention any of these conditions you might be suffering from on the online questionnaire you are provided during a consultation.
Viagra shouldn't be taken by men who are already taking any of the nitrate drugs for heart ailments. This combination of nitrate drugs and Viagra can cause the blood pressure to drop to unsafe levels in the body, thus causing serious complications. In some cases, it can also prove to be fatal.
Additionally, the use of Viagra blue pills is not recommended in men who suffer from heart or blood vessel problems that make sexual intercourse difficult. Men who have suffered a heart attack or a stroke in the last 6 months should also avoid taking Viagra.