I find splitting pills to be tedious and unsatisfactory because most shatter into tiny pieces no matter what. That said, I have found single edge razor blades in a scraper type holder to be the most effective, and I use rubber coated tweezers to hold the pill still and keep the shattered parts from splattering everywhere.(ALL ITEMS PURCHASED AT hARBOR fREIGHT)  The pill splitters are ineffective after 6-12 uses with the meds i must cut- they become dull and corroded and shatter the pills even more until they must be discarded. sO SINGLE EDGED BLADES are much cheaper than buying a new cutter every week or so.  But,  It is all such a waste oF  time money and effort!