flush your old prescriptions, or other medications.
They end up in the water, and that is bad. Just
throw them away. If you are concerned about someone digging
through your trash, then mix them with used kitty litter or some other
Also, remember that those prescription labels have personal information
of them. You might want to obliterate that before you throw
out the bottles.
And of course, the federal government has official
guidelines for disposal of medications.