My not-so-frum-yet relative borrowed some pills from a neighbor of mine. He then got his prescription filled and wants me to return the borrowed pills for him. (That was what was agreed upon originally.) He also sent some extra slightly different pills to show his appreciation. I’m worried that’s ribbis. I could just not give him the pills and give them back to the relative, but I want to pass on his chosen sign of appreciation if it is in fact allowed. What should I do? Thank you.
It is not permitted to give the extra pills as a “token of appreciation,” and as you rightly note this involves a ribbis issue.
You can mention that he wanted to give the extra pills as a token of appreciation.