I think Buscopan is different. Apparently hycosine hydrobromide (Kwells, Scopolamine) can cross the blood-brain barrier, while hyoscine butylbromide (Buscopan,

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.