What are TriMix Injections? TriMix is an FDA approved erectile dysfunction mediation made by special compounding pharmacies. It has been used since 1983 to treat ED and is considered the most effective non-surgical solution for ED according to the American Urologic Association. TriMix consists of 3 medications that each have certain properties that when mixed help men get and maintain an erection. You can buy TriMix injections online through the right sources.