Viagra tablets. Time of action
Probably, every man at least once heard about Viagra. This world-famous medicine is intended to strengthen potency, sexual desire. The basis of Viagra is the substance sildenafil. What are sildenafil tablets, where you can buy generic viagra online, how long do they work?
How does sildenafil work in the body.
Sildenafil belongs to the group of selective inhibitors of phosphodiesterase PDE5. It improves the flow of blood to the genitals, thereby leading to the appearance of an erection. It has already been said that Viagra comes in the form of tablets, they are painted in blue.
Time of action of the drug sildenafil and dosage.
The dosage of the drug is 100 mg. A day can not use more than 100 mg. sildenafil. Now as to the time of action of the drug. The tablet is washed down with water and shows its effectiveness after about 15-20 minutes. The duration of action is 4-4.5 hours.
Feature of Viagra: the ability to manage the erection.
During this time, a man at any time can cause an erection for sexual intercourse. It should be noted that sildenafil manifests itself only if a man experiences sexual arousal. Without the presence of the last, an erection does not come.
That is, a person has the opportunity to control the time of onset of an erection. This is very convenient, because walking with a constant excited penis like not everyone. Finally, let's say about the situation when the reception of Viagra is prohibited and possible side effects.
What negative factors can be encountered?
So, cavernous fibrosis, genital deformity, sickle cell anemia, diseases of the cardiovascular system, multiple myeloma, leukemia, angulation, stomach ulcer are those situations when it is impossible to use sildenafil. It is also contraindicated to combine with nitrate medicines and donators of nitric oxide.
Possible side effects: dizziness, headache, dyspepsia, diarrhea, skin rashes, redness of the face, increased sensitivity of the eyes to light, nausea, tremor. Such situations are most often caused by the use of a large dose of sildenafil (over 100 mg.).