Therefore, most of these ED medication side effects are more or less similar. Cialis is a brand-name prescription medication. All of four of the PDEinhibiting drugs approved for use in America stimulate erections through the same chemical reaction. How Effective Is Cialis? Viagra generally only stays in your system for four to six hours.Cialis is used for the treatment of erectile dysfunction (ED). It increases blood flow to the penis following sexual stimulation and allows men to keep an erection .  · Cialis (tadalafil) is prescribed to treat erectile dysfunction and symptoms of benign prostatic hyperplasia. It comes as a tablet that’s taken as needed or once per . How does Cialis work? Cialis works by increasing blood flow to the penis to help a person get and maintain an erection. It also blocks the PDE5 enzyme, which .

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