Not to mention the possibility of triggering a response that the trigger would help combat if you already exhibited the response. Or it simply being an uncommon

Not to mention the possibility of triggering a response that the trigger would help combat if you already exhibited the response. Or it simply being an uncommon side effect that it's made worse. Headaches and nausea are listed in possible side effects for just about everything, because if anyone reports it they have to list it since the possibility of causality hasn't been ruled out.