Sildenafil Citrate, and Levitra as anti-impotency drugs and erectile dysfunction medications produce their effect by vasodilating the arteries and veins of the body and more selectively on the penile vasculature thus producing an erection or sustaining one. However this effect is not confined solely on the penile vasculature but also affects to a limited extent the microcirculation of the entire body. This leads to some of the side effects that sometimes contraindicate its use. One of these side effects is flushing of the skin. The blood vessels of the skin becomes dilated and blood is pooled into them thus producing the flushing effect. Another would be a palpating type of headache also produced by the increase in the blood flow to the brain. This is similar to the effect of other vasodilating drugs used in angina pectoris and congestive heart failure such as Nifedipine or Verapamil. As the drug wears off, the headache gradually disappears. Another side effect would be an increase in urine output which results from the increase in cardiac output and renal perfusion resulting in a higher glomerular filtration rate. An uncommon result would be dehydration because of the increase in urine formation.
The aforementioned side effects are not that life threatening and thus can be tolerated as long as they are known and monitored by the physician prescribing the medication. A more dangerous side effect is extreme hypotension from the pooling of blood peripherally. This may lead to fatal heart failure.
Considering all these and the ease with which you can buy Sildenafil Citrate or buy Levitra in an online pharmacy, you need to seek professional advice and learn extensively about the drugs before using them.
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