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The active ingredient of Viagra is Sildenafil Citrate. It is available in twenty five milligrams, fifty milligrams and one hundred milligram tablets in a blue colored, diamond shaped tablet. That is why it is commonly referred to as the blue tablet or diamond pill. Its use is to correct or alleviate erectile dysfunction in the male or male physical impotence. The causes of this disease are varied but the most common cause is age related arteriosclerosis of the micro vasculature of the penis thus occluding the inflow of blood during arousal leading to an unsuccessful erection. Blood cannot go to the Corpus Spongiosum of the penis and therefore the penis remains flaccid. Another prevalent cause of male erectile dysfunction or male physical impotence is Diabetes Mellitus. In this systemic disease, aside from the multi organ involvement, there is also an advanced atherosclerotic change in the micro vasculature. The penile vascular system is affected thus leading to erectile dysfunction and the patho physiology is similar to the age related erectile dysfunction.
'; echo 'The mechanism of action of Viagra or Sildenafil Citrate is that it acts as a selective vasodilator. It is selective in that it affects predominantly the micro vasculature of the penile or male genital area with little or negligible effect on the other micro vasculature of the body. This selective effect on the cardiovascular system makes it the drug of choice for male erectile dysfunction or male physical impotence. In terms of its vasodilating effect, it relaxes the smooth muscles of the arteries and arterioles thus widening the artery or arteriole. This increase in the size or lumen of the artery or arteriole increases the influx or flow of blood to the region of the penis. It is this increase in influx or inflow of blood which results in a penile erection.
'; echo 'The variation in dosage is due to the variation in the severity of the decrease in the lumen or size of the arteries and arterioles in the micro circulation. The more severe the occlusion of the artery or arteriole, the higher the dosage of Viagra required to correct the decrease in blood flow. This mechanism of action of Viagra makes it relatively safe except for those who are suffering from a concomitant disorder such as hypertension or congestive heart failure. It is thus safe to buy viagra in the pharmacies. Anyone can also buy viagra online which is more convenient.
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