This is an over the counter product - it does not require prescription. Pets can have trouble swallowing pills, or sometimes a pet is too difficult to pill. Other times a tablet or pills is too large for a pet to swallow. The pill crusher crushes pills into a powder that can be put into food, a treat or a liquid, making the medication palatable. The pill crusher works by dropping the pill into the clear chamber and screwing the top portion directly into it. It has a handy storage area in the lid to keep extra tablets close by. Top and bottom have raised knurled ridges for easy tightening. Made of high impact plastic. Packaged in blister pack display. Instructions: Unscrew cap from clear base. Place pill in deep well of clear base. Screw cap back onto clear base, crushing pill. then unscrew cap. Pour crushed pill into food, milk, liquid vitamin solution or treat. Mix thoroughly.