I don't think this med causes constipation. I have been on Promethazine, 25mg, 4 times a day for many years due to problems with Crohns Disease. Vomiting can be a problem with Crohns patients. In the 10+ yrs I have been on it, I can never blame constipation on it. This is strictly from a personal point of view and use. We all know meds can affect different people differently, but I think it is highly unlikely this is the source of your problem. Best wishes, ChelleKay
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