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This article is pretty sketchy with the science, as most popular press is when reporting medicine. It's also Vice, which while I read a lot of, is not exactly the New England Journal of Medicine.
Toradol, or ketorolac, is a non-narcotic painkiller, of the NSAID class. It's pretty much super strong advil, and it's main indication is for acute pain. My experience with it is limited- sometimes for postoperative pain management, however since it can lead to a higher risk of postoperative bleeding and that's generally not well tolerated in head and neck surgery procedures, I don't commonly use it.
The side effect profile of ketorolac is similar to other NSAID medications. Just as with advil, long courses can predispose to kidney injury or gastrointestinal bleeding. I just did a quick pubmed search, and the only article that specifically looked identified ketorolac as potentially cardioprotective. This was a relatively poor article. From what I can tell, the potential risks of myocardial infarction with ketorolac is based on experience with other NSAID medications, and this is an area of emerging knowledge. Only recently have we appreciated that nonspecific NSAIDs such as advil can elevate cardiac risk. We've known for a bit longer that COX-2 selective NSAIDs such as a celecoxib increase cardiac risk. It seems that some NSAIDs, such as naproxen (aleve) may not have this risk profile. With what we know now, most MDs would not recommend people with elevated cardiac risk factors take prolonged courses of NSAIDs.
Does ketorolac predispose to myocardial infarction? The evidence is not there to say definitively either way. In a young and otherwise healthy person it seems unlikely.
To the broader issue of toradol usage in sports, it sounds like most NFL and college football teams use it off-label. Many medications are used off-label in medical practice. However as with any medical intervention, informed consent to treatment is critical. Most players receiving these shots probably were never told of potential risks versus benefits, which is wrong, though I suspect many players probably don't care about the risks. I think players should be discouraged from frequent toradol injections, but if they want them and receive them frequently should probably be monitored for kidney injury. Players with elevated cardiac risk (these would be rare) should be counseled against frequent toradol injections.
Sounds like this guy acted improperly. But I think some context is useful in understanding the topic.