I am allergic to minocycline, ciprofloxacin, promethazine, erythromycin & Nitrofurantoin. I was just prescribed Clindamycin. Is that ok to take?

Should be fine. Yes, clindamycin is not related to the other medications you list as being allergic to. However, you are likely not allergic to all these medications. You should see an allergist who can help you sort out which ones you are truly allergic to and which ones you can safely take.