Pictured above is a 50 milligram viagra pill. The letters 'pfizer' appear on one side and 'vgr 50' can be seen on the opposite side. If the pill were 100 milligrams, 'vgr 100" would be seen in the lower photo.

The pills are blue in color but the images presented here should not be used to judge the exact color. The color you are seeing will vary depending on the source. Try looking at this page on two different monitors. Usually there will be some color difference.