Also, if you can get your hands on a pill filter, do so.
(They have them in melbourne needle exchanges for $1, they attatch to 3mL syringes. I'm guessing they're availble everywhere, don't know. Just contact your local harm min. group and ask about them)
Although they won't make shooting pills 100% safe (nothing will) they do greatly reduce the amount of solids getting inside you, which does make it alot safer than without one.