Development of viagra
Sildenafil citrate is originally developed in 1991 as a treatment for angina, or chest pain or discomfort that occurs when an area of your heart muscle doesn't get enough oxygen-rich blood. Angina may feel like pressure or squeezing in your chest. The pain also may occur in your shoulders, arms, neck, jaw, or back. It can feel like indigestion. The drug, marketed under the name Viagra, and received Food and Drug Authority market clearance as a treatment for impotence in March 1998 and since then it has been prescribed for over 8 million men worldwide suffering from impotence. Viagra is first of its kind as an oral medication approved to treat erectile problems. Viagra is considered as vasodilator- a drug that is responsible for dilating the blood vessels. It works by improving blood circulation to the male reproductive organ and by enhancing the effects of nitric oxide, the agent that relaxes the smooth muscle of the penis and regulates blood vessels during sexual stimulation allowing it to become enlarged and achieve an erection.
The average recommended dose of viagra is 50 mg. For men who do not respond adequately to this amount, they may increase the dosage up to 100 mg or decreased to 25 mg. Viagra requires time to be absorbed by the body to become effective. Medication should be taken approximately one hour before sexual activity, and may remain effective for up to four hours. Sexual stimulation and arousal are required for the medication to be effective. Viagra does not increase sexual desire. Despite its widespread use as a drug for enjoyment, it is not an aphrodisiac and there is no clinical evidence that it improves sexual performance in men who are not suffering from ED.
Men should always consult with their physician before beginning treatment with sildenafil citrate. The medication is not for everyone, and a healthcare professional needs to evaluate medical history and perform a thorough medical examination before prescribing the drug. In addition, erectile dysfunction may be a symptom of an undiagnosed condition (i.e., diabetes) for which treatment is critical, and may actually reverse the impotence problem.
The most commonly reported risks by those who buy viagra are headache, flushing of the face and nasal congestions.
Other less common side effects include, but are not limited to vision problems, including sensitivity to light, blurred vision, and a color tinge to vision, urinary tract infection, diarrhea, dizziness and rash.
Side effects may be reduced or eliminated through adjustments to dosage. Men who experience these symptoms should consult their physician.
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