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Because Cialis and Viagra are both PDE5 inhibitors, they have similar side effects and safety concerns. Talk with your healthcare provider about which might be best for you. Nitric oxide is a substance that causes blood vessels to relax. This leads to more blood flow to the penis, leading to stronger erections.

PAH is a specific kind of pulmonary hypertension that occurs in the arteries of your lungs. If you take Cialis for occasional use to treat erectile dysfunction (ED), you should take your dose before sexual activity. When taken for occasional use to treat ED, the effects of Cialis have been shown to last up to 36 hours. The normal dosage of Cialis for occasional use in treating ED is 10 mg taken before sexual activity.

According to Viagra's FDA-approved prescribing information, between 63% and 84% of patients reported an improvement in their erections after taking Viagra. A licensed healthcare provider will review your information and find the best treatment plan for you. When a man is sexually stimulated, his body experiences several chemical and physical things simultaneously. First, a rapid heartbeat caused by excitement sends blood rushing to the far reaches of the body. Tadalafil (Cialis) is known as a phosphodiesterase 5 (PDE5) inhibitor. Phosphodiesterase 5 is a neurotransmitter the body releases at the termination of the sexual act to allow erections to go down.

Nitric oxide then activates the enzyme guanylate cyclase, which results in increased levels of cGMP. Cyclic guanosine monophosphate causes smooth muscle relaxation in the corpus cavernosum thereby allowing inflow of blood