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Cialis is an effective, reversible, selective inhibitor of phosphodiesterase type 5 (PDE 5) specific to cyclic guanosine monophosphate (cGMP). When sexual stimulation causes local release of nitric oxide, inhibition of PDE 5 by Cialis leads to increase of cGMP levels in the cavernous body of penis. It results in relaxation of arterial smooth muscles and blood flow to the tissues of the penis that causes erections. Cialis has no effect when sexual stimulation is absent. Cialis improves erection and lets achieve a successful sexual intercourse. The drug acts during 36 hours. If sexual arousal is present the effect appears even after 16 minutes after the medication was taken.Packaging side effect of cialis Contains

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USPS Critical Mail - Arrives in 3 business days depending on location. cialis pill shape LEVITRA has been shown to be effective in men over the age of 18 years who have erectile dysfunction, including men with diabetes or who have undergone prostatectomy.(3, 6)These used vials, seized during a raid in Colombia, were being washed for reuse to hold counterfeit medications.

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Effects of Viagra on Sperm: There was no effect on sperm motility or morphology after single 100 mg oral doses of Viagra in healthy volunteers. have liver problems

Cialis 5 mg for Once Daily Use for ED and BPH cialis 20 mg directions Levitra BPH and ED/BPH all other medications you use for erectile dysfunction;

GastrointestinalTadalafil, sildenafil, and vardenafil all act by inhibiting the PDE5 enzyme. These drugs also inhibit other PDE enzymes. Sildenafil and vardenafil inhibit PDE6, an enzyme found in the eye, more than tadalafil.[7] Some sildenafil users see a bluish tinge and have a heightened sensitivity to light because of PDE6 inhibition.[8] Sildenafil and vardenafil also inhibit PDE1 more than tadalafil.[7] PDE1 is found in the brain, heart, and vascular smooth muscle.[7] It is thought that the inhibition of PDE1 by sildenafil and vardenafil leads to vasodilation, flushing, and tachycardia.[7] Tadalafil inhibits PDE11 more than sildenafil or vardenafil.[7] PDE11 is expressed in skeletal muscle, the prostate, the liver, the kidney, the pituitary gland, and the testes.[7] The effects on the body of inhibiting PDE11 are not known.[7]PRESCRIBED FOR: Viagra is used for the treatment of erectile dysfunction of either physical or psychogenic cause, and for pulmonary arterial hypertension.