Hi eyanosa,
You're in a tricky situation I'm sorry but I would definitely be checking with your Doctor who prescribes the Loperamide.

I read a couple of different drug/drug interaction sites - the drugs.com one and the Johns Hopkins ABX Guide. I think the info that I read on the drug.com site, although confusing in itself, was more a warning about self treating with anti diarrhea medications if you developed diarrhea while on the Clindamycin in case it was covering up side effects that could be potentially very serious.

I read your other posts and understand the situation as best that I can. I realize it's complicated, but please call your Doctor who treats you for your IBS (or your Doctor's office to speak to an RN) to check.

Please let us know how you get on.
take care.