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. I would also call your local pharmacist or ask the doctor that prescribed it why this would have happened.