I Had Been Under Treatment For Last 7 Days For

I had been under treatment for last 7 days for Cold/Bronchitis and prescribed Zethrolag for 5 days with Butalin for 3 times x 5 days and Aeries 1 tab x 5 days. For the last 4 days i have been having loose motions for about 2-3 times a day. My antibiotic ended yesterday and i still had loose motion (once) today. I have a history of IBS, but never had any issues for IBS in last few months. Kindly advise.