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The Clinical Pharmacology and Pharmacokinetics of the drug Cialis Cialis is an oral treatment for erectile dysfunction with an empirical formula of C22H19N3O4 representing a molecular weight of 389.41 and this drug is available as a film coated, almond-shaped tablets for oral administration. The inactive ingredients of this drug are the following: microcrystalline cellulose, sodium lauryl sulfate, lactose monohydrate, talc, titanium dioxide, croscarmellose sodium, hydroxypropyl cellulose, iron oxide ,magnesium stearate and triacetin.
The mechanism of action of this drug : Penile erection during sexual stimulation is caused by increased penile blood flow resulting from the relaxation of penile arteries and corpus cavernosal smooth muscle. The response is mediated by the release of nitric oxide from endothelial cells and nerve terminals which stimulates the synthesis of cGMP in smooth muscle cells.
Cyclic GMP enables the smooth muscle relaxation and increased blood flow into the corpus cavernosum and the inhibition of phosphodiesterase type 5 enhances erectile function by increasing the amount of cGMP. Cialis inhibits PDE5 because of sexual stimulation is required to initiate the local release of nitric oxide and the efficacy of this drug has no effect in the absence of sexual stimulation.
Studies in vitro have demonstrated that Cialis is a selective inhibitor of PDE5 and is located in corpus cavernosum smooth muscle, vascular and visceral smooth muscle, platelets, skeletal muscle, kidney, cerebellum, lung and pancreas. In vitro studies have shown that the effect of Cialis is more effective on PDE5 than on other phosphodiesterases.
Cialisis >10,000-fold more potent for PDE5 than for PDE3, an enzyme that can be found in the heart and blood vessels. Additionally, Cialis is 700-fold more potent for PDE5 than for PDE6, which is located in the retina and is responsible for phototransduction. This drug is >9,000-fold more potent for PDE5 than for PDE8, PDE9, and PDE10 and 14-fold more potent for PDE5 than for PDE11A1, an enzyme located in human skeletal muscle. Cialis inhibits human recombinant PDE11A1 activity at concentrations within the therapeutic range.