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Of these, headache is the most common side effect and typically disappears within a few hours after taking the medication. Tadalafil stops the breakdown of a chemical responsible for relaxing muscles. In ED and PAH, the drug targets muscle cells in blood vessels. Only 5% of males between the ages of 20 and 39 report ED symptoms, while over 70% of males over 70 report difficulty having or maintaining an erection.

To understand how ED pills like Viagra and Cialis work, it’s important to first learn how erections work. Erections start in the brain with an arousing thought, and a chemical reaction causes the penile blood vessels to dilate so that more blood can enter. The inflow of blood causes the erectile tissue of the penis to expand, which then compresses the veins and limits the outflow of blood. This balance of increased blood inflow and minimal blood outflow ultimately results in an erection. Ask your healthcare provider or pharmacist if you are not sure if any of your medicines are nitrates or guanylatecyclase stimulators, such as riociguat. Over a dose range of 2.5 to 20 mg, tadalafil exposure (AUC) increases proportionally with dose in healthy subjects.

The rate and extent of absorption of tadalafil are not influenced by food