DRUG CLASS AND MECHANISM: levitra is an oral drug that is used to treat impotence (the inability to attain or maintain a penile erection,cheap levitra.). It is a phosphodiesterase inhibitor that is similar to sildenafil (Viagra,cheap levitra).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 in size and increase the delivery of blood to the penis. At the same time, the blood vessels carrying blood away from the penis decrease in size and decrease the removal of blood from the penis. Sexual stimulation that leads to the engorgement and erection causes the production and release of nitric oxide in the penis. Nitric oxide then activates the enzyme (or try cheap levitra), guanylate cyclase to produce cyclic guanosine monophosphate (cGMP,also try cheap levitra). The cGMP is primarily responsible for increasing and decreasing the size of the blood vessels carrying blood to and from the penis, respectively. levitra prevents an enzyme called phosphodiesterase-5 from destroying cGMP so that cGMP persists longer. The longer cGMP persists, the more prolonged the engorgement of the penis. levitra was approved by the FDA in August, 2003. PRESCRIBED FOR: levitra is used for the treatment of impotence.

DOSING: For most individuals, the recommended dose of levitra is 10 mg per day taken 60 minutes before intercourse. If there is no response or side effects, the dose may be increased to 20 mg or, if there are side effects, it may be reduced to 5 mg. Individuals 65 years of age (best drug,cheap levitra) or older should begin therapy with 5 mg. Individuals who are taking medications that increase the blood levels of levitra should start treatment with 2.5 to 5 mg of levitra.

SIDE EFFECTS: The most common side effects of levitra are facial flushing (reddening,cheap levitra), headaches, stomach upset, diarrhea, flu like symptoms and nausea. levitra also may cause chest pain, low blood pressure, blurred vision and changes in color vision, abnormal ejaculation and priapism (painful erection,order cheap levitra). Rare cases of sudden loss of hearing have been reported with phosphodiesterase inhibitors such as levitra, sometimes associated with ringing in the ears and dizziness. If changes in hearing occur, patients should discontinue their levitra and seek immediate medical attention.