Anti-inflammatory painkillers work well, and they carry two serious risks that the labels state in a boxed warning: cardiovascular events including heart attack and stroke, and gastrointestinal bleeding, ulceration and perforation. Both can be fatal. The gastrointestinal ones, according to the labels, can occur at any time during use and without warning symptoms.

This is not an argument against taking them. NSAIDs are effective and widely prescribed for good reasons. It is an argument for knowing what the warning actually says, because these are the medicines people are most likely to take casually, for longer than intended, and alongside something they did not mention.

Key takeaways

  • The boxed warning is on the class, not one bad drug. The diclofenac label states that NSAIDs cause an increased risk of serious cardiovascular thrombotic events, including myocardial infarction and stroke, which can be fatal.
  • The risk can start early. The label says it may occur early in treatment and may increase with duration of use.
  • GI bleeding can arrive with no warning at all. The ketorolac label states these events can occur at any time during use and without warning symptoms.
  • Elderly patients are at greater risk of serious gastrointestinal events.
  • NSAIDs are contraindicated around heart bypass surgery (CABG).
  • Ketorolac is limited to five days total, is not for minor or chronic pain, and raising the dose adds risk without adding benefit.
  • Heat and dehydration matter here. NSAIDs affect the kidneys, and the renal risk rises with volume depletion.
  • The lowest effective dose for the shortest period is the principle behind every one of these warnings.

What exactly does the boxed warning say?

That NSAIDs increase the risk of serious cardiovascular thrombotic events and of gastrointestinal bleeding, and that both can be fatal.

A boxed warning is the strongest warning a medicine label carries. The diclofenac label puts both risks in one box, headed “RISK OF SERIOUS CARDIOVASCULAR AND GASTROINTESTINAL EVENTS”, and states:

  • Cardiovascular: “Nonsteroidal anti-inflammatory drugs (NSAIDs) cause an increased risk of serious cardiovascular thrombotic events, including myocardial infarction and stroke, which can be fatal. This risk may occur early in treatment and may increase with duration of use.”
  • It is also contraindicated in the setting of coronary artery bypass graft (CABG) surgery.

The same class warning appears on celecoxib, meloxicam, indometacin and ketorolac. It describes the class, which is why “I’ll take a different anti-inflammatory instead” is not by itself a way around it.

Two phrases are worth reading twice. “May occur early in treatment” removes the assumption that short courses are automatically safe. “May increase with duration of use” is why the standing advice is the shortest course that works.

Why is the stomach risk the one that catches people out?

Because it can happen without any warning symptoms.

Most people expect a stomach problem to announce itself as indigestion. The ketorolac label states plainly that peptic ulcers, gastrointestinal bleeding and perforation of the stomach or intestines can be fatal, and that these events can occur at any time during use and without warning symptoms.

That is why the absence of stomach ache is not reassurance, and why the risk factors matter more than how you feel:

  • Age. The label states elderly patients are at greater risk for serious gastrointestinal events.
  • A history of ulcer or GI bleeding. For ketorolac this is an outright contraindication, including active peptic ulcer disease, recent GI bleeding or perforation, and a history of either.
  • Taking more than one NSAID at once, which is easier to do by accident than it sounds, since some combination products and cold remedies contain one.
  • Anticoagulants, alcohol, and long duration of use.

Signs that need urgent attention rather than a wait-and-see: black or tarry stools, vomiting blood or material that looks like coffee grounds, or severe persistent stomach pain.

Are some NSAIDs more restricted than others?

Yes, and ketorolac is the clearest example in this catalogue.

Its boxed warning is unusually long, and its restrictions are unusually specific:

  • It is indicated only for short-term, up to 5 days in adults, management of moderately severe acute pain requiring analgesia at the opioid level.
  • Oral ketorolac is only a continuation of intravenous or intramuscular dosing, and the total combined duration must not exceed 5 days.
  • It is not indicated for minor or chronic painful conditions, and not for children.
  • Increasing the dose beyond label recommendations will not give better efficacy but will increase the risk of serious adverse events.
  • It is contraindicated in advanced renal impairment and in patients at risk of renal failure from volume depletion.
  • It inhibits platelet function and is contraindicated where there is a bleeding risk, and as a preventive painkiller before major surgery.

If you have been given ketorolac, the five-day limit is not a guideline. It is the licensed condition of use.

Does the climate here change anything?

Yes, through the kidneys. NSAIDs reduce blood flow to the kidneys, and that matters most when you are already short of fluid.

The ketorolac label makes the connection explicit by contraindicating it in patients at risk of renal failure due to volume depletion. In a climate where fluid loss through sweat is routine, and during a fasting month when intake is restricted for long stretches, that risk factor is not theoretical.

Three practical consequences:

  • Keep fluid intake up while taking an NSAID, particularly in summer.
  • Be careful combining an NSAID with a diuretic, since both act on the kidneys from different directions. Raise it with your prescriber rather than assuming.
  • Take extra care during Ramadan, covered in Ramadan and your medication.

Separately, several NSAIDs increase sun sensitivity, and storage limits apply as they do to everything else, which we cover in storing medicine in a Gulf summer.

Who should be most careful?

People with cardiovascular disease, kidney problems, a history of GI bleeding, and anyone already on several medicines.

Raise it with a doctor or pharmacist before taking an NSAID if you:

  • have had a heart attack or stroke, or have heart failure or angina
  • are due to have, or have recently had, heart bypass surgery
  • have kidney disease or have been told your kidney function is reduced
  • have had a stomach ulcer or gastrointestinal bleeding
  • take an anticoagulant or antiplatelet medicine
  • take a diuretic, an ACE inhibitor or an angiotensin receptor blocker
  • are pregnant, or trying to become pregnant
  • are older, since age raises the GI risk

Pain that keeps needing an anti-inflammatory week after week is itself a reason to be reassessed. Ongoing pain deserves a diagnosis, not an indefinite prescription.

How do I use them as safely as possible?

Lowest effective dose, shortest necessary period, one NSAID at a time, and with food.

  • Take the lowest dose that controls the pain, for the shortest time that works.
  • Take only one NSAID at a time. Check combination and cold remedies for a hidden second one.
  • Take with or after food.
  • If a doctor has prescribed a stomach-protecting medicine alongside, take it. It is there for the risk described above.
  • Keep fluid intake up.
  • Stop and seek advice for black stools, blood in vomit, severe stomach pain, chest pain, breathlessness, or sudden weakness or speech difficulty.

Do and don’t

Do:

  • Read the boxed warning on the leaflet rather than assuming it does not apply.
  • Tell your prescriber about heart, kidney or stomach history.
  • Take with food and keep hydrated.
  • Observe the five-day limit on ketorolac.
  • Take a prescribed stomach protectant alongside the NSAID.

Don’t:

  • Don’t take two NSAIDs at once, including hidden ones in combination products.
  • Don’t treat the absence of stomach pain as evidence there is no risk.
  • Don’t increase the dose to get more effect.
  • Don’t use an NSAID long term for chronic pain without review.
  • Don’t take one around bypass surgery.

Frequently asked questions

Are the newer COX-2 medicines safer? They carry the same boxed cardiovascular warning. Celecoxib’s label states the class warning about serious cardiovascular thrombotic events in the same terms. Any difference in gastrointestinal risk is a matter for your prescriber, not a reason to assume the cardiovascular warning does not apply.

Is a topical gel safer than a tablet? Less drug generally reaches the bloodstream from a topical NSAID, which is why they are used for localised pain. That is not the same as no systemic exposure, and the same cautions are worth mentioning to a pharmacist.

I have taken these for years with no problem. Does that mean I am fine? Not necessarily. The label’s point is that the serious gastrointestinal events can occur at any time during use and without warning symptoms, and the cardiovascular risk may increase with duration of use. Long use without incident is not the same as low risk, which is why periodic review matters.

Where to go next

The pain and anti-inflammatories category lists what is stocked here, and the ingredients index maps each active ingredient to the brands containing it, which is the reliable way to check whether something you already take is an NSAID.

MedicForce option: each product page carries the product information for that medicine, including its warnings, so you can read them before ordering.

The boxed warning text quoted above is from the approved product labelling for diclofenac and ketorolac, which is reproduced on the relevant product pages in this catalogue.