Viagra is a medication used for the treatment of sexual dysfunction in men, also known as erectile dysfunction. According to PDRHealth, Viagra works by dilating the blood vessels in the penis, allowing the inflow of blood needed to sustain an erection. There are some bad side effects of Viagra of which men should be aware prior to taking this medication.
Hearing and Vision Loss
Some patients taking Viagra may experience hearing or vision loss. According to Drugs.com, vision loss occurred in a small number of people taking Viagra, most of whom also had heart disease, diabetes, high blood pressure, high cholesterol, or certain pre-existing eye problems as Viagra decreases blood flow to the optic nerve of the eye. Vision loss while taking Viagra is also a concern for those who smoke, or are over age 50.
Priapism
A bad side effect of Viagra is priapism. Priapism is the development of an erection that becomes painful and lasts for four hours or longer. Viagra should be taken as directed by a physician. Viagra should not be taken more than once daily, explains PDRHealth. If left untreated, priapism may cause permanent damage to the penis. Men who experience this effect should seek immediate medical attention.
Heart Attack and Stroke
Men using nitrate drugs for chest pain or heart problems should not take Viagra. Taking Viagra with a nitrate medicine can cause a serious decrease in blood pressure, leading to fainting, stroke, or heart attack. Men who experience dizziness, nausea, or have pain, numbness, or tingling in the chest, arms, neck, or jaw while having sex should stop and call their physicians right away, explains Drugs.com. These symptoms may indicate a serious reaction to Viagra.
Allergic Reaction
Viagra can cause allergic reactions. Men who have had an allergic reaction to Viagra in the past should not take this medication. Symptoms of an allergic reaction can include rash, hives, difficulty swallowing or breathing, and a swelling of the lips, tongue or throat, explains Drugs.com. Patients who think they may be having an allergic reaction to Viagra should seek emergency medical attention.
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