Clindamycin causing constipation, just me?

I have IBS-C. Due to a rather severe infection, I'm on clindamycin 3x/day. I usually take doxycycline monohydrate 2x/day for a skin condition, but due to this current infection, I'm off that. My constipation has been manageable on doxy, but not clindamycin. Does anybody else get constipation when they are on an antibiotic vs diarrhea? If so, what do you do about it? I'm having a hard time figuring out how to take my probiotics when I have to take them either two hours before or 4 hours after the clindamycin.
Thanks for your input. =)