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Cialis augments and supports sexual performance and relationships. A series of chemical reactions occurs in the tissues of the penis during sexual arousal. Ultimately, a chemical called cyclic guanosine monophosphate (cGMP) causes the penis’s smooth muscle tissues to relax. This relaxation allows blood vessels to widen, and more blood flows into the penis. As a sufficient amount of blood accumulates, the penis enlarges and an erection occurs. In general, tadalafil has been well tolerated in patients with PAH.

It improves blood flow to the penis during sexual stimulation in order to cure ED. The active substance in Adcirca, tadalafil, belongs to a group of medicines called ‘phosphodiesterase type 5 (PDE5) inhibitors’, which means that it blocks the PDE5 enzyme. When the enzyme is blocked, a substance called ‘cyclic guanosine monophosphate’ (cGMP) cannot be broken down and remains in the vessels where it causes the relaxation and widening of the blood vessels. In patients with PAH, this lowers the blood pressure in the lungs and improves symptoms. Cialis is a prescription medication containing the active ingredient tadalafil.

This signal cascade is attenuated by PDE5 which breaks the phosphodiester bond of cGMP, converting it to GMP. Inhibition of PDE5 by tadalafil increases signaling via the PKG cascade which supports penile smooth muscle relaxation during sexual arousal by decreasing Ca2+ entry into smooth muscle cells. This smooth muscle relaxation allows blood to fill the corpus cavernosum thereby producing an erection. Tadalafil, as a selective PDE-5 inhibitor, has an effect similar to sildenafil and thus it decreases pulmonary hypertension by reducing hypoxic pulmonary vasoconstriction in HAPE (Schmidt, 2015