Is cialis a PDE-5

[nevermind]

Is cialis an actual PDE-5 inhibitor? Is it is why does it last 36 hours and why does viagra only last about 5 hours? If they are both PDE-5 should they not last almost the same amount of time or is it due to tadalafil vs sildenafil?

[tictacer]

All 3 cialis viagra and levitra and PDE-5 inhibitors but they are all very different. i do not know for sure why cialis can last longer but it is due to the main ingredient tadalafil. Vardenafil is the ingredient for levitra and Sildenafil Citrate is the one for viagra they both last up to 5 hours or so.