Ketorolac is not a controlled substance. It has no DEA schedule designation, meaning it is not classified alongside opioids, benzodiazepines, or other drugs with recognized potential for abuse or dependence. That said, ketorolac is a prescription medication with unusually strict usage limits for a non-controlled drug, which is likely why many people wonder about its classification.
Why People Assume It’s Controlled
Ketorolac has a reputation for being powerful, and that reputation is earned. In a network meta-analysis comparing pain relievers for acute kidney stones, ketorolac outperformed morphine at both 30 and 60 minutes after administration. Morphine was the least effective option at those time points and required rescue medication more often than any other treatment studied. So when a drug relieves pain as well as or better than morphine, it’s reasonable to wonder whether it carries similar legal restrictions.
It doesn’t, because the restrictions on controlled substances target a specific problem: the potential for addiction and misuse. Ketorolac works through a completely different mechanism than opioids. Instead of acting on the brain’s pain and reward pathways, it blocks enzymes called COX-1 and COX-2 that produce inflammatory compounds called prostaglandins. By reducing prostaglandin production, it lowers inflammation and pain at the source. There is no euphoria, no physical dependence, and no withdrawal syndrome. That’s why the DEA does not schedule it.
It Still Requires a Prescription
Even though ketorolac isn’t controlled, you can’t buy it over the counter. It’s available as an injection (given in hospitals or clinics) and as oral tablets, both of which require a prescription. The injectable form is the one most people encounter first, typically after surgery or in an emergency room. If you’re sent home with ketorolac tablets, they’re meant as a short continuation of that initial treatment.
The Five-Day Limit
Ketorolac carries one of the strictest time limits of any prescription painkiller. The FDA caps the total combined use of all forms (injection plus oral) at five days. This isn’t a soft guideline. It’s printed in a black box warning on the label, the most serious type of safety alert the FDA issues.
The reason is that ketorolac’s risks increase sharply with dose and duration. Those risks fall into several categories:
- Gastrointestinal bleeding. Ketorolac can cause peptic ulcers, stomach bleeding, or intestinal perforation. These events can happen without any warning symptoms and can be fatal. Older adults face the highest risk.
- Kidney damage. The drug can cause acute kidney failure, particularly in people who are dehydrated or already have reduced kidney function.
- Bleeding problems. Ketorolac inhibits platelet function, meaning your blood doesn’t clot as effectively. Post-surgical wound bleeding has been reported.
- Cardiovascular events. Like other NSAIDs, ketorolac may increase the risk of heart attack and stroke, with risk rising the longer you take it.
These are the same types of side effects seen with over-the-counter NSAIDs like ibuprofen and naproxen, but ketorolac is more potent, so the risks are concentrated into a shorter, more dangerous window. The five-day cap exists specifically to keep exposure brief enough to limit these complications.
Who Should Not Take Ketorolac
The list of people who should avoid ketorolac entirely is longer than for most pain medications. It is contraindicated if you have active peptic ulcer disease, a history of GI bleeding, advanced kidney problems, or are at risk of kidney failure due to dehydration. People with bleeding disorders or those at high risk of bleeding should not take it. It’s also off-limits before major surgery, during labor and delivery (because it can affect fetal blood flow and inhibit contractions), and after coronary artery bypass graft surgery.
If you’ve had asthma attacks, hives, or allergic reactions after taking aspirin or other NSAIDs, ketorolac is not safe for you. You also cannot take it alongside aspirin or other NSAIDs, because stacking these drugs multiplies the risk of serious side effects.
How It Compares to Controlled Painkillers
The practical difference between ketorolac and a controlled substance matters most at the pharmacy. Because ketorolac has no DEA schedule, your prescription doesn’t need to go through the monitoring systems that track opioid dispensing. There are no refill restrictions tied to controlled substance laws, no requirement for a new prescription each time (though the five-day limit makes refills uncommon), and no state prescription drug monitoring program flags.
From a pain relief standpoint, ketorolac fills a specific niche: short-term, moderate-to-severe acute pain where avoiding opioids is preferable. It offers comparable or superior pain control to morphine for certain conditions while carrying fewer side effects like nausea, sedation, and constipation. In the kidney stone study, morphine was associated with the highest rate of adverse events among all treatments compared. Ketorolac’s risks are different in nature, centered on bleeding and organ damage rather than sedation and dependence, but they are serious enough to justify the tight prescribing limits it carries.