Cisapride, Quinidine, Pimozide, dofetilde, or levacetylmethadol as it can cause fatal heath rhythum with these drugs. Some drugs such as blood thinners (
Warfarin/coumadin) will have a much higher affect of the drug and so I would think it would the opposite and cause too much blood thinning and hemorrhage. Is he on Coumadin/Warfarin? If so perhaps it caused a hemorrage and led to stroke but the package insert doesn't mention that specifically.