The OTC drugs in question are Mebendazole (methyl 5-benzoyl-2-benzimidazole-carbamate) and Cimetidine.
Mebendazole (MZ) is a widely-available deworming chemical that has very few side effects. Worms, it seems, use a compund called tubulin to hold themselves together. Interestingly, so do tumor cells. When MZ is taken, it does not affect healthy cells. It simply prevents cancer cells from dividing and spreading. Eventually, the cancer cells simply die off. MZ is marketed under the names Vermox, Ovex, Antiox and Pripsen. Those in the U.S. will have to go online and order from Canada because, as soon as these studies began to emerge, they yanked it from the market.
Citetidine, an over-the-counter acid reducer, most commonly sold under the brand name Tagamet, is taken with MZ on an empty stomach as it prevents the liver from making an enzyme which breaks down MZ. By doing this, the half-life of MZ is effectively increased for pennies. (I know how this community feels about antacids... I feel the same way, but the studies show MZ to be effective longer with them.)
For links to a few studies, visit here: http://www.viewzone.com/mebendazole.html
