Everyone has excess drugs from the vet (or human doc!) and isn't sure how to dispose of them. We don't want them in our watershed so let's be SUPER CLEAR about how this should go.
Grind up the meds in a pestle and mortar.
Clean it when you're done or you'll not be feeling your toes for a few hours!
Make a pot of coffee in the morning.
Mix the meds in the used grounds.
Bury the grounds in the garden or organic compost bin.
Sharpie-out the info on the medication label.
Dispose of the bottles in the recycle bin.
Thanks for being conscientious about your drugs. And saving the local water system from disatrous amounts of medication!