Well, except that these serious adverse effects are often so rare to not have any way of reaching statistical significance. Especially when you consider that yo

Well, except that these serious adverse effects are often so rare to not have any way of reaching statistical significance. Especially when you consider that you're looking for associations between medication and any indication. Just by random chance you'd get a many associations between serious diseases and any medication. The very rare and very serious side effects are tracked closely, and it's likely that for a vast number of medications, even though the very rare side effects are written on the packaging, there actually is no causal connection with the medication whatsoever.