How Tadafire Works Tadafire belongs to a class of medicines called phosphodiesterase type 5 (PDE5) inhibitors. Its action is based on a natural physiological process that supports erection. During sexual stimulation, the body releases nitric oxide (NO) in the penile tissues. This triggers the production of cyclic guanosine monophosphate (cGMP), which relaxes the smooth muscles … Continue reading Tadafire