Buying medicine at a drugstore can now save you taxes.

On Jan. 1, the "self-medication tax deduction" system kicked off, allowing people who buy designated over-the-counter (OTC) drugs to apply for a tax refund. The move, intended to promote use of OTC drugs and discourage people from clogging up hospitals and clinics for minor ailments, will be in place for the next five years. Following are questions and answers about the new system:

How does it work?