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Viagra® (sildenafil citrate) is a prescription medication used for treating erectile dysfunction.
What Is Viagra Used For?
Viagra has been licensed for the treatment of erectile dysfunction. Erectile dysfunction (ED), also known as impotence, can be a total inability to achieve erection, an inconsistent ability to do so, or a tendency to sustain only brief erections. Essentially, erectile dysfunction is the repeated inability to get or keep an erection firm enough for sexual intercourse.
How Viagra Works
Penile erection is caused by the engorgement of the penis with blood. This engorgement occurs when the blood vessels delivering blood to the penis increase the delivery of blood and the blood vessels carrying blood away from the penis decrease the removal of blood. Under normal conditions, sexual stimulation leads to the production and release of nitric oxide in the penis. Nitric oxide then activates the enzyme, guanylate cyclase, which causes the production of cyclic guanosine monophosphate (cGMP). It is the cGMP that is primarily responsible for the erection by affecting the amount of blood that the blood vessels deliver and remove from the penis.
Viagra works by blocking PDE5. When PDE5 is blocked, more of the chemicals responsible for the erection remain, so the muscles in the penis do not constrict. This allows blood to stay in the penis longer, which allows the man to maintain an erection.
How Taken
Viagra comes as a tablet to take it orally. It should be taken as needed about 1 hour before sexual activity. However, Viagra can be taken anytime from 4 hours to 30 minutes before sexual activity. Viagra should not be taken more than once a day. Do not take more or less of it or take it more often than prescribed by your doctor.
Precautions
You should talk with your healthcare provider prior to taking Viagra (sildenafil citrate) if you have:
Heart disease or blood vessel disease
Liver disease or liver failure
A history of a heart attack, stroke, or life-threatening arrhythmia within the past six months
Retinitis pigmentosa, which is a rare eye problem
Low blood pressure (hypotension)
High blood pressure (hypertension)
Sickle cell anemia
Multiple myeloma
Leukemia
A history of priapism, which is a painful erection lasting longer than six hours
Any condition that causes a penis deformation, such as angulation, Peyronie's disease, or cavernosal fibrosis
Any allergies.
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This drug information is for your information purposes only, it is not intended that this information covers all uses, directions, drug interactions, precautions, or adverse effects of your medication. This is only general information, and should not be relied on for any purpose. It should not be construed as containing specific instructions for any particular patient. We disclaim all responsibility for the accuracy and reliability of this information, and/or any consequences arising from the use of this information, including damage or adverse consequences to persons or property, however such damages or consequences arise. No warranty, either expressed or implied, is made in regards to this information.
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