Description
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What is Generic Viagra 150 Mg ?
Viagra is the brand name of the prescription medicine sildenafil. It’s used to treat erectile dysfunction (trouble getting or keeping an erection) in men.
Another brand name of sildenafil, called Revatio, is used to treat pulmonary arterial hypertension (high blood pressure in the lungs) and improve exercise ability in men and women with this condition. You shouldn’t take Viagra and Revatio together, unless your doctor tells you to do so.
Viagra is in a class of medicines known as phosphodiesterase (PDE) inhibitors. It works by increasing blood flow to the penis.
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 inhibits an enzyme called phosphodiesterase-5 (PDE5) which destroys the cGMP. Thus, Viagra prevents the destruction of cGMP and allows cGMP to accumulate and persist longer. The longer cGMP persists, the more prolonged the engorgement of the penis. The FDA approved Viagra in March 1998.
- The usual recommended dose is 25 to 100 mg 1 hour before sexual activity.
- The maximum dose is 100 mg daily.
- The elderly (over 65 years of age) should start at 25 mg before sexual activity.
- Sildenafil is rapidly absorbed. Maximum observed plasma concentrations are reached within 30 to 120 minutes (median 60 minutes) of oral dosing in the fasted state. When sildenafil is taken with a high fat meal, the rate of absorption is reduced, with an average delay in the time to maximal concentration of 1 hour.
Side Effects
Along with its needed effects, sildenafil may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.
Check with your doctor immediately if any of the following side effects occur while taking sildenafil:
Less common
- Bladder pain
- burning feeling in the chest or stomach
- burning, crawling, itching, numbness, prickling, “pins and needles”, or tingling feelings
- cloudy or bloody urine
- dizziness
- increased frequency of urination
- indigestion
- pain on urination
- stomach upset
- tenderness in the stomach area
Rare
- Abnormal vision
- anxiety
- behavior change similar to drunkenness
- bleeding of the eye
- blurred vision
- bone pain
- breast enlargement
- chest pain
- chills
- cold sweats
- confusion
- convulsions (seizures)
- cool and pale skin
- deafness or hearing loss
- decrease in amount of urine or the frequency of urination
- decreased vision
- difficulty in concentrating
- dizziness or lightheadedness, especially when getting up suddenly from a lying or sitting position
- double vision
- drowsiness
- dry eyes
- dry mouth
- dryness, redness, scaling, or peeling of the skin
- excessive hunger
- eye pain
- fainting or faintness
- fast, irregular, or pounding heartbeat
- feeling of something in the eye
- fever or chills
- headache (severe or continuing)
