Hi, Augie. I've heard of this too, but I'm not sure which medications it applies to. My friend who has PCOS can't take it with one of her medications. I did a search and only came up with this list - Possible Interactions with SFS. I think if it does react with your medication it should say so when you look up medical info on that specific drug. I was just prescribed amitriptyline and the info sheet mentioned not taking it with an SFS or with a high fiber meal; since I take it at bedtime it's not a problem.
HTH a little! If you have any other questions you could ask your pharmacist.
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Re: SFS and medication timing
If you have any other questions you could ask your pharmacist. 
