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When a man is sexually stimulated, the nervous system in the erectile tissue of your penis releases nitric oxide (NO). The nitric oxide stimulates an enzyme that produces a 'messenger' called cyclic guanosine monophosphate (cGMP). According to Asanad, a urologist may prescribe a low dose of daily Cialis with as-needed Viagra to improve treatment outcomes. But taking Viagra and Cialis together increases the risk of side effects like headache, runny nose, or heartburn and should only be done with a doctor’s supervision.
It is not known if tadalafil is effective in patients who have had pelvic surgery or removal of all or part of the prostate gland. Other causes include spinal injury or operations on the prostate or bowel. Regular cycling for 3 or more hours a day may also contribute to ED.
When PDE5 is blocked, cGMP levels increase, leading to the relaxation of smooth muscle cells in blood vessels. This increases blood flow, which can help treat conditions like erectile dysfunction and pulmonary hypertension. PDE5 inhibitors improve symptoms of erectile dysfunction (ED) by preventing the breakdown of a substance called cyclic GMP (cGMP). CGMP acts as a vasodilator, which means it relaxes smooth muscle and widens blood vessels allowing more blood flow into tissue. This also increases blood flow into the corpus cavernosum