Opium is the best drug for diarrhea, but it takes time to titrate the dosage. It may take several weeks to find the "right" dose that works for each individual. Also, as Kath M. said, no medication works all of the time. As I mentioned previously, the doses of opium tincture used to control diarrhea are well below the normal doses that would be used to control pain; hence, the opium should stop the diarrhea, but it may not stop the pain from cramps, etc. You may need to find another drug, such as Bentyl (an anti-spasmodic), Donnatal, Librax, whatever, that will relieve other symptoms that are causing pain. Of course, opium could be used in higher doses to control pain, but I would strongly advise against it, because taking high doses of morphine regularly can lead to dependence, addiction, tolerance and a whole host of other problems.I also agree with Kath that your daughter should investigate alternative therapies, because opium tincture by itself controls only diarrhea. Also, other modalities might allow your daughter to get relief from diarrhea without relying too heavily on opium.I'm in a somewhat unique situation-- I have IBS with diarrhea, but I rarely, if ever, have pain -- maybe 1x or 2x a month. So, the opium has been a Godsend for me, because it basically has controlled my IBS. However, most people have other symptoms regularly along with diarrhea or constipation-- such as cramping, bloating, gas, etc. that cause pain.