I was researching Doxy for Lyme disease but I read your reference to IBS and abdominal cramping. I suffered with that for many years (couldn't eat without diarheea) and tried various medications, mainly Bentyl, but after some research on my own recognized I was not getting enough fiber in my diet. I take 2 Metamucil pills a day and symptoms gone - I am regular and no more stomach cramping. Not sure this will help you but you might look into it. I cured myself.
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