Aha! I have heard Americans say they buy Buscopan for IBS when in the Uk as it’s not available at all in the US and it has the same active ingredient! I had no idea it was good for nausea too.
I think Buscopan is different. Apparently hycosine hydrobromide (Kwells, Scopolamine) can cross the blood-brain barrier, while hyoscine butylbromide (Buscopan, a derivative of hycosine hydrobromide) cannot. The effect on the body seems pretty dissimilar.
