If you have ever suffered from a common condition called erectile dysfunction, you may have wanted to try a pill like Viagra to alleviate the problem. After all, it has helped many men achieve longer and harder erections during sexual intercourse. However, before you pop that little blue pill, you may be interested in learning more about what is actually in Viagra. The main active ingredient in Viagra is a white or off-white crystal-like powder called sildenafil citrate. This powerful ingredient inhibits PDE5, which reduces the production of cGMP (cyclic guanosine monophosphate) in the smooth muscle of the penis. The other ingredients contained in Viagra that help to increase the CGMP levels include: dibasic calcium phosphate, FD & C Blue #2 aluminum lake, titanium dioxide, anhydrous croscarmellose sodium, magnesium stearate, microcrystalline cellulose, hypromelloselactose and triacetin.