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Medicine & Dentistry

Cialis Patient Tips

How it works Cialis is a brand (trade) name for tadalafil. Tadalafil blocks the action of an enzyme known as cGMP-specific phosphodiesterase type-5 (PDE-5). This enzyme breaks down cGMP, a substance that induces smooth muscles to relax. Blocking PDE-5 means increased levels of cGMP within the smooth muscles which promotes muscle relaxation and vasodilation (a …