My Daughter Age Is 15 Month. She Has Stomach Problem.

My daughter age is 15 month. She has stomach problem. After feeding she was passing normal stool.(she passed stool 3 time a day) Last week she was feeling fever and therefore, I took her to Doctor who gave a syrup namely Enterogermin. After giving him this syrup her stomach become effected and she is not passing normal stool. Due to reshez and hard stool she cry. She is facing great problem. Pl advised me any medicine for her relief.thank you