hello and thank you for using healthcaremagic. i understand your concern, as an upset bowel cant be ignored easily. first i would recommend to take as much fluids as possible, but not something very sweet or salty. it is ideal to take oral rehydration solution(ORS) which is the primary treatment of diarrhea. It is available over the counter and is easy to prepare and drink. it is made in a way that it mimics the body fluids and easily absorved even by a diseased intestine,and also provides adequate nutrition. as you have already taken metron(hopefully the entire course), there is a chance of a infection by a specific bacteria known as Clostridium difficile. which causes long duration of diarrhea. it shows up in culture after about 3 days of diarrhea. it is also good that you are taking bifilac, but it is not required to take for more than a week. So to sum up, 1. Take ORS, 2. bifilac more than a week is not necessary, also it doesn t cause constipation or diarrhea. a good and home made alternative is curd/yoghurt 3. it is advisable to do a Cl. difficle culture. i wish you to get well soon. hope the above information have been helpful for your query. if you have any more question please feel free to ask.