The biggest differences between Viagra and Cialis ... Cialis contains the active ingredient tadalafil. Tadalafil or generic Cialis can be taken either on demand or as a daily ED medication.

Studies of selective phosphodiesterase type 5 inhibitors (sildenafil [Viagra], vardenafil [Levitra], and tadalafil [Cialis ... and clinically significant difference. Only 28% of sildenafil ...

At the end of OLT, improvement was significant for tadalafil OaD versus placebo only (p = 0.035). No significant differences were observed for SEAR. Conclusions These results suggest that ...

Fortunately, most tadalafil side effects are mild and ... vardenafil (Levitra), and avanafil (Stendra®). One difference is that Cialis is active in the body for longer than other oral ED meds ...