1. Tossed in the trash
2. Flushed down the toilet
3. Given to a "take-back" program for recycling and / or safe disposal
If you are tossing them in the trash, what you should do is remove them from the original containers. You want to pour liquid medicines into some kitty litter to absorb the liquid, and you want to crush the pills and mix them with kitty litter or coffee grounds or something else to make them more undesirable.
It looks like drug take-backs are usually in October and April, so I will tuck away my unused medicine that can't be flushed into a box, and am marking it on my calendar.
Remember my picture showing the master bathroom?
Have you gone through your medicine recently? How much were you able to get rid of?