Sure.
The statistics would at best be impressionistic. I would suggest that probably the best source to consult would be the Canadian Medical Protective Association, which is aware of litigation involving physicians.
However, I would caution you that the American literature is quite informative. If you look at litigation for malpractice generally, and not specifically focused on drug reactions, you'll find that the vast majority of these cases are not because there was an issue of negligence or inappropriate practice, but because of the outcome that the patient didn't particularly like. Malpractice litigation is a bad reflector of bad medical practice. Turning that around, and this is important, the vast majority of people who do experience negligent care never bring suit. So the American system is not a good indicator.