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The most important aspect of using viagra online that everyone should be aware of is a complete prohibition to use it in a period of 6 month or more if a person had heart-stroke or some kind of a heart issue lately. Also consulting your physician is a must for patients with retinitis pigmentosa.

Viagra acts by increasing blood flow to the penis which is achieved by sildenafil working as vasorelaxant. The result of inhibiting the PDE5 is the erection of the penis however it is natural that Viagra will fail if no sexual desire is present. Do not misinterpret Viagra, it should be understood that the medication does not act by stimulation sexual desire but helps to erect the penis when sexual desire is present. The aim of the drug is to treat the ED and it does its work properly bringing back the man power. ED might be caused by a number of factors including weakness, tiredness, stress or a sitting way of life. Viagra is meant to be sued by men who are of age 18 or more only.
Contraindications

It is forbidden to take Viagra when in state of weak health, which might include but not be limited by recent operations, heart diseases or other health problems causing bad state of heart. Apart from this it is forbidden to use the drug when taking nitrates or experiencing heavy arrhythmias. Pay special attention to the description before using Viagra and do not hesitate to consult your doctor when feeling doubt about it.