First of all, what is Viagra? This beautiful word was originally formed by merging the words vigor that is energy or power and Niagara – the name of a famous waterfall that is always associated with power. Viagra directs energy in a man up being a strong activator of erection. Viagra clearly solves the delicate problems of men. In other words, brand Viagra or generic Viagra promote a firm natural erection.

What is the mechanism of action of drugs such as Viagra? Viagra is the best of the existant drugs treating erectile dysfunction. When a man is sexually aroused, Viagra (sildenafil) pumps blood into the penis, causing a persistent lasting erection. At the same drugs containing Sildenafil – brand or generic Viagra – do not affect other functions of the body, purposely acting only in their area. Viagra is used for erectile dysfunction of psychogenic, organic or mixed character.

Viagra should be taken 1 hour before the sexual intercourse. The recommended dose for adults is 50 mg once a day. Taking into account the individual tolerability and efficacy of the drug, the dose can be increased to 100 or decrease to 25 mg. The maximum daily dose is 100 mg.

By men’s reviews, Viagra is generally well tolerated. In rare cases, it may cause nausea, dizziness, and increased muscle tone, flushing, headache, and blurred vision.

Viagra is a drug used in men only. It is not intended for use in women and children. Elderly male patients should use Viagra with care and start with a lower dose of 25 mg. Also, Viagra must not be used together with nitrates as it may lead to severe adverse reactions. If a man has one of the following diseases, he should not take Viagra as well:

• intolerance to the components of the drug
• anatomical deformation of the penis
• tendency to bleeding
• liver dysfunction
• evere hypotension or hypertension
• leukemia, multiple myeloma and sickle cell anemia
• various heart diseases