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Hi, It's Dr. C. Board certified physician. I can help you today.
I'm sorry that you're having stomach pain. This is a known side effect of clindamycin in some people. It's not serious but will make it hard for you to complete the course of antibiotics you were given.
In this situation, you should call your doctor and let them know what is going on. They may decide to change you to different antibiotic that you may not have the same sensitivity to.
I hope this was reassuring and helpful. Please reply if I can clarify anything.