Hi, Welcome to Health care magic forum. As you describe, it is due to the zomax. amoxycillin has the property of causing loose motions and gastric irritation. You may get relief in few days, if not consult your doctor for the same. I usually prescribe to my patient with such symptoms ofloxacin,ranitidine, lactic acid bacilli, and loperamide if there is frequency. Avoid taking spices, junk foods, and oily foods. Wishing for a quick and complete recovery. Thank you.