Hi My Son Is 1.6 Year Old And Suffering From

Hi my son is 1.6 year old and suffering from prosecutions from last 6 days. We started giving him econorm sache twice a day and Zincolife. From 3rd day his condition worsened and we went for stool test. Giardia lambia was diagnosed and we started giving metrogyl as advised by doctor. After continuing for 2 days and no Sign of improvement, doc suggested us for zifi100 twice a day. Please suggest.