Tadalafil, also known as Cialis, is a reversible selective inhibitor of specific PDE5 cyclic guanosine monophosphate (cGMP). It is often called a more prolonged version of another famous ED treatment drug Viagra.

The effects:

• Makes muscles more pronounced;
• Stimulates blood flow thus increasing stamina;
• Improves cognitive capacity and overall body state.

Cialis is a relatively safe drug. It still can cause negative effects, especially if abused.