Cialis and Viagra are equally effective. Cialis stays in your system for up to 36 hours and may provide support for erections during that entire time. Prolonged erections can be dangerous. The most common side effects are headaches, feeling sick, indigestion and facial flushes. These medicines are called PDE5 inhibitors. What should I talk to my doctor about when considering if Cialis is right for me?AdLearn how to achieve peak erections safely using clinically proven ingredients. Male UltraCore is a premium erection pill designed to for erection size and ry Leaders · Watch Video · Fully Equipped · Custom Formulation. About tadalafil Brand names: Cialis, Adcirca. About tadalafil. Tadalafil is a medicine used to treat erection problems (erectile dysfunction) and symptoms of an enlarged prostate (benign prostate enlargement). It’s also sometimes used to treat pulmonary hypertension (high blood pressure in the blood vessels that supply the lungs). Last updated on Uses Warnings Before taking Dosage Side effects Interactions FAQ What is Cialis? Cialis relaxes muscles of the blood vessels and increases blood flow to particular areas of the body. Cialis is used to treat erectile dysfunction (impotence) and symptoms of benign prostatic hypertrophy (enlarged prostate).