Any medicament, even the most proven, can cause side effects. As a rule, Viagra medicament has good tolerability and its negative effects have a minimal expression (such data were obtained during drug testing with more than 3700 male persons).

Common side effects of Viagra

Common Viagra side effects include a backache, headache, feeling sick, water retention, stuffy nose, head congestion etc. The frequency of these effects is from one to 10 people out of 100 taking the medicament.

Infrequent and rare medicament’s bad effects
Another group of the medicament’s bad effects comprises the so-called infrequent bad effects. This group includes the following health conditions: diarrhea, fever, skin redness, problems with breathing, rash etc. The frequency of these effects is from one to 10 male persons out of 1000 taking the medicament. Some Viagra users find that they cannot visually distinguish the green and blue colors (i.e., they cannot see these colors). Moreover, some gained an effect known as cyanopsia. This side effect causes a male person to see everything that surrounds him painted in deep blue color. People related to the machine control, such as pilots and drivers, must be careful, and perhaps avoid taking the remedy before dealing with machinery.
In addition, the remedy can lead to the so-called rare bad effects (their frequency is less than 0.1%):
1) dispiritedness, bad thoughts;
2) problems with blood pressure (sharp dropping when getting up, permanently low pressure);
3) painful sensations in the chest;
4) problems with heartbeat;
5) hemorrhages (in brain, in eyes);
6) asthma;
7) priapism;
8) pain in muscles;
9) sexual problems etc.

Overdosing

The mechanism of the medicament action is based on the engorgement of blood vessels, so an overdose of the medicament leads to a variety of negative consequences associated with the cardiovascular system. The most typical symptoms are chest pain and low blood pressure. Moreover, as experts from the Mayo Clinic say, it can lead to fainting, irregular heartbeat, heart attacks, and sometimes even death.
One of the most famous cases of Viagra overdose is that of Daniel Medford, a 36-year-old construction worker from Withernsea, the United Kingdom. Daniel took 35 tablets of Viagra to a friend’s house for fun. Soon the man felt unwell, he had hallucinations and vertigo; all items seemed to be green. All those effects took place against the background of a strong erection. Medford returned home to his wife, who immediately sent him to the hospital. Medford stayed in the hospital for a day and a half. The erection kept for 5 days. This case is not the first in clinical practice, but the end result is one of the most successful.
In 2013, a Colombian man took too many blue tablets in order to impress his girlfriend. He suffered from constant erection for a few days. Only when the pain became unbearable, he went to the clinic. Colombian doctors diagnosed a penile fracture, inflammation and gangrene. The only solution was amputation, otherwise, gangrene could spread to other organs.