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SSRIs are a good choice for patients with IBS (irritable bowel syndrome) constipation. You need to take some antispasmodics along with them plus acid suppression drugs as well.
First of all, drink plenty of water at least 10 to 12 glasses per day. Take a fiber diet as much as possible. Regarding bacterial overgrowth, you can use tetracyclines and Metronidazole but Metronidazole will increase your constipation. But one thing to remember is that in bacterial overgrowth there is usually diarrhea not constipation, so forget about SIBO (small intestinal bacterial overgrowth).
Take the following medications which will help with IBS constipation.
1. Tablet Mebeverine 135 mg thrice a day before meals for 4 to 8 weeks
2. Tablet Rifaximin 550 mg twice a day before meals for two weeks.
3. Tablet Clearlax (Bisacodyl) 15 mg once daily at night for one month.
I hope you will feel better.