March 11, 2011 Posted by, olivia, viagra vs Levitra. Viagra and Levitra are drugs to combat erectile dysfunction. Both belong to the levitra duration of action levitra levitra for sale duration of action buy real levitra online class of levitra duration of action PDE-5 inhibitors cialis levitra viagra and are approved by FDA. Viagra is more popular among the lot. The underlying mechanism of these drugs is the same. They help to increase levitra duration of action the blood flow and cause erection. Viagra, the chemical compound in Viagra is sildenafil citrate. The drug takes about half an hour to start its course of action levitra duration of action and the effects last for approximately four hours. The dosage required to get the biological action is higher. It is the first approved drug among the PDE-5 inhibitors. PDE-5 inhibitors inhibit the action of phosphodiesterase type 5 which causes degradation of cyclic levitra duration of action GMP in smooth muscle cells. The enzyme is present in the smooth muscle cells of the penis as well as the arterial lining of the lungs. Hence the drug is known to be effective in treating pulmonary hypertension also. Levitra, levitra is the brand name of vardenafil hydrochloride. The drug is primarily used to treat erectile dysfunction and the effects are reported to be lasting long. The duration for the onset of biological action is also low. The drug is effective at smaller doses of 10-20. Contraindications and side effects are known to be reported. Difference between Viagra and Levitra. Drug class both belong to the same class of drugs PDE-5 inhibitors. Mechanism of action they are found to block the degradative action of Phosphodiesterase type 5 on cyclic GMP found in smooth muscle cells of the penis as well as arterial walls of lungs. A high cGMP level allows relax of smooth muscle cells and better flow of blood. The blood flow increases substantially causing the erection. Time for onset of biological action. Both take similar time periods for starting the course of biological action. However, the effects are more pronounced if Viagra is taken atleast 1 hour before sex. Levitra on the other hand levitra v viagra should be taken before half an hour. Duration of efficacy, viagra effects are known to last approximately for four hours whereas cheap levitra samples levitra no prescription L:evitra gives a higher duration lasting up to 6 hours. Approval by FDA- Both drugs are approved by FDA and are prescription drugs. Viagra is sold without prescription also in some countries.
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