A Toradol (ketorolac) injection starts relieving pain within about 10 to 30 minutes, depending on whether it’s given into a vein or a muscle. You can expect the strongest relief to hit around 1 to 2 hours after the injection, with the effect lasting 4 to 6 hours total.
IV vs. IM: How the Method Changes Onset
The two most common ways to receive a Toradol injection are intravenously (IV, directly into a vein) and intramuscularly (IM, into a large muscle like the thigh or buttock). The route makes a meaningful difference in how quickly the drug kicks in.
An IV injection begins working in about 10 minutes. An IM injection takes closer to 20 minutes. Both routes reach peak pain relief within 1 to 2 hours, and both provide roughly 6 hours of duration. If you’re in an emergency room or post-surgical recovery area, you’ll likely receive the IV route for faster relief. IM injections are more common in outpatient settings or when IV access isn’t already established.
How Toradol Reduces Pain
Toradol is a nonsteroidal anti-inflammatory drug (NSAID), the same class as ibuprofen and naproxen, but considerably more potent. It works by blocking the production of prostaglandins, chemicals your body releases at the site of injury or inflammation. Prostaglandins sensitize nerve endings to pain signals and promote swelling, so reducing them tackles both the pain and the inflammation driving it.
Because it’s an NSAID rather than an opioid, Toradol doesn’t cause the drowsiness, nausea, or dependency risks associated with narcotic painkillers. That’s a major reason it’s frequently used for kidney stones, post-operative pain, severe migraines, and other acute pain situations where strong relief is needed without sedation.
What the Injection Feels Like
IM injections of Toradol can sting or burn at the injection site. This is one of the more common complaints, and the discomfort usually fades within a few minutes. Other side effects that some people notice include dizziness, drowsiness, headache, and mild digestive issues like diarrhea or constipation. Sweating and ringing in the ears are less common but possible.
Dosing Differences by Age and Weight
Adults under 65 typically receive 60 mg for an IM injection or 30 mg for an IV injection as a single dose. If you’re 65 or older, weigh under 110 pounds, or have any kidney impairment, the dose is cut in half: 30 mg IM or 15 mg IV.
When multiple doses are needed, the standard schedule is 30 mg every 6 hours for younger adults, with a daily ceiling of 120 mg. For older adults or those with kidney concerns, it drops to 15 mg every 6 hours, capping at 60 mg per day. Total treatment with Toradol injections is limited to 5 days. This isn’t a soft guideline. The short time limit exists because the drug’s potency comes with real risks when used beyond that window.
Who Should Not Receive Toradol
Toradol carries a boxed warning, the FDA’s most serious safety label, for several conditions. It is contraindicated if you have active peptic ulcer disease, recent gastrointestinal bleeding or perforation, or a history of stomach ulcers. It’s also off-limits for people with advanced kidney impairment or those at risk of kidney failure from dehydration.
The reason ties back to how the drug works. Prostaglandins don’t just cause pain. They also protect the stomach lining and help maintain blood flow to the kidneys. Blocking them aggressively with a potent NSAID like Toradol can erode that protection, leading to stomach bleeding or a dangerous drop in kidney function in vulnerable patients. If you have a history of either issue, make sure your provider knows before receiving the injection.
What to Expect After the Injection
Most people feel noticeable improvement within 20 to 30 minutes, with the full effect building over the next hour or two. The relief typically holds for 4 to 6 hours. If you’re receiving Toradol in an emergency setting, providers often reassess your pain around the 30-minute mark to decide whether additional treatment is needed.
Because the drug can cause dizziness or drowsiness in some people, it’s worth having someone available to drive you home if you’re receiving the injection in an outpatient or urgent care setting. The drowsiness, when it occurs, is usually mild compared to opioid alternatives, but it can still affect your ability to drive safely.