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Since Viagra has disabled the PDE5, the cGMP in the penis doesn’t break down but instead it builds up and the arteries in the penis fully dilate. The penis then fills with pressurized blood and an erection occurs. Side Affects of Viagra Viagra works perfectly for most men, however nearly all drugs have side affects because they are flowing throughout the entire body, not just the part that needs the drug. Viagra blocks PDE5 but it also can block PDE6 which is an enzyme that affects the cones of the retina. Because of this, Viagra can have an affect on color vision. Another side affect of Viagra affects users who take nitroglycerin for angina. Nitroglycerin works by increasing nitric oxide, which helps angina by opening the arteries that take oxygen to the heart.
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Levitra is the latest prescription erectile dysfunction treatment drug. It is available on prescription in many parts of the world including the UK. This erectile dysfunction treatment has offered hope for men who can not take either Viagra or Cialis. The main ingredient in Levitra is vardenafil, which works by increasing blood circulation in the penis. Due to better blood regulation in the penis, men are able to achieve and sustain a better erection occurs which allow them to have satisfactory sexual intercourse. However, erection comes about only in the presence of sexual stimulation. How can you take dosages of Levitra?The tablets of Levitra are available in dosages of 10mg and 20mg. You should always stick to the dosage that has been recommended by your doctor.

Viagra is a kind of PDE-5 enzyme inhibitor medicine which, if taken one hour before sex, can increase blood flow through penis causing strong and continued erection. Male person with erectile dysfunction, now, has got a solution in Viagra against his problem. At this age of Internet on line Viagra information are abundant in the thousands of Web sites. We are providing here a few extracts from them.. Viagra pills are prescription drugs with some side effects which some times may become fatal. So its use should be closely monitored by a doctor. It is available in the market in 25mg, 50 mg and 100mg. The dose will be determined by the doctor prescribing it.