NSAIDs — short for non-steroidal anti-inflammatory drugs — are some of the most commonly used medications in Canada. You may already take them without knowing it. Drugs like ibuprofen and naproxen are NSAIDs, and millions of Canadians reach for them to ease pain, reduce fever, and control inflammation. This article explains how NSAIDs work, who should use them carefully, and what risks to watch for.
What Are NSAIDs?
NSAIDs are a group of medications that reduce pain, swelling, and fever. They work by blocking certain chemicals in the body called prostaglandins. Prostaglandins are substances that trigger inflammation and pain signals. By lowering prostaglandin levels, NSAIDs help you feel better faster.
Unlike opioids or corticosteroids, NSAIDs do not contain steroids and are not addictive in the traditional sense. However, that does not mean they are risk-free. Even over-the-counter versions can cause serious side effects if used incorrectly.
Common NSAIDs Available in Canada
You can find many NSAIDs at your local pharmacy without a prescription. Some of the most common ones include:
Ibuprofen (sold as Advil or Motrin)
Naproxen (sold as Aleve or Naprosyn)
Aspirin (sold as Aspirin or generic brands)
Diclofenac (often prescription-strength in Canada)
Celecoxib (a prescription NSAID known as a COX-2 inhibitor)
Ketorolac (used in hospital or clinical settings)
Prescription NSAIDs are often stronger and used for chronic conditions. Your family doctor or pharmacist can help you choose the right option for your situation.
What Conditions Do NSAIDs Treat?
NSAIDs are a first-line treatment for many painful and inflammatory conditions. Doctors across Canada prescribe them regularly for both short-term and long-term use. They are especially important in managing chronic inflammatory diseases like rheumatoid arthritis.
In addition, NSAIDs help with many everyday health concerns. They are versatile and widely trusted when used properly.
Short-Term Uses
For short-term relief, NSAIDs work well for conditions such as:
Headaches and migraines
Muscle aches and sprains
Toothaches
Menstrual cramps
Fever reduction
Minor injuries and post-operative pain
Long-Term and Chronic Uses
For chronic conditions, NSAIDs play a much bigger role. They are often the foundation of treatment plans for:
Rheumatoid arthritis — a condition where the immune system attacks the joints
Osteoarthritis — the most common form of arthritis in older Canadians
Ankylosing spondylitis — a type of inflammatory spinal arthritis
Gout — a painful form of arthritis caused by uric acid crystals
Lupus-related joint pain
Tendinitis and bursitis
According to Mayo Clinic’s guide on arthritis pain medications, NSAIDs remain one of the most effective tools for managing joint inflammation across a wide range of conditions.
How Do NSAIDs Work in the Body?
To understand NSAIDs, it helps to know a little about inflammation. When your body detects injury or illness, it releases enzymes called COX-1 and COX-2. These enzymes produce prostaglandins, which cause swelling, pain, and fever. NSAIDs block these enzymes and slow down prostaglandin production.
Therefore, less inflammation means less pain. It sounds simple, but the process affects several systems in your body at once — which is why side effects can occur.
COX-1 vs. COX-2 Inhibitors
Traditional NSAIDs block both COX-1 and COX-2 enzymes. COX-1 also helps protect your stomach lining, so blocking it can lead to digestive problems. COX-2 selective inhibitors, like celecoxib, target only the COX-2 enzyme. As a result, they tend to be gentler on the stomach.
However, COX-2 inhibitors may carry a higher risk of heart-related side effects. Your doctor will weigh the benefits and risks before recommending one type over the other.
Risks and Side Effects of NSAIDs
NSAIDs are effective, but they come with real risks — especially when used long-term or in high doses. Understanding these risks helps you use them more safely. Health Canada encourages Canadians to report adverse drug reactions through its MedEffect programme.
Digestive Side Effects
The most common side effects of NSAIDs affect the digestive system. These include:
Stomach upset and nausea
Heartburn or acid reflux
Stomach ulcers
Gastrointestinal bleeding (more serious and requires immediate care)
To lower this risk, always take NSAIDs with food or milk. Your doctor may also prescribe a stomach-protecting medication called a proton pump inhibitor (PPI) alongside long-term NSAID use.
Cardiovascular Risks
NSAIDs can raise your blood pressure and increase the risk of heart attack or stroke, especially with long-term use. This risk is higher in people who already have heart disease or high blood pressure. Furthermore, this concern applies to both prescription and over-the-counter NSAIDs.
If you have a history of heart problems, talk to your family doctor before taking any NSAID regularly. Even short-term use may need closer monitoring in high-risk individuals.
Kidney and Liver Concerns
Long-term NSAID use can reduce blood flow to the kidneys, leading to kidney damage over time. People with existing kidney disease are especially vulnerable. In addition, high doses can sometimes affect liver function, though this is less common.
Staying well hydrated and following your doctor’s recommended dose can help protect your kidneys during NSAID therapy.
Other Possible Side Effects
NSAIDs can also cause:
Skin rashes or allergic reactions
Fluid retention and swelling in the legs
Headaches (paradoxically, especially with overuse)
Dizziness
Increased risk of bleeding, including during surgery
Always tell your healthcare provider about all medications you take, including over-the-counter drugs and supplements, as NSAIDs can interact with blood thinners, certain antidepressants, and other medicines.
Who Should Avoid NSAIDs?
NSAIDs are not safe for everyone. Certain groups of people face much higher risks when using them. Before starting any NSAID, it is important to know whether you fall into one of these categories.
You should use NSAIDs with extreme caution — or avoid them entirely — if you:
Are pregnant, especially in the third trimester
Have a history of stomach ulcers or gastrointestinal bleeding
Have chronic kidney disease or liver disease
Have heart failure or have had a heart attack or stroke
Take blood thinners like warfarin or apixaban
Have uncontrolled high blood pressure
Are over 65 years old (higher risk of complications)
Have a known allergy to aspirin or other NSAIDs
Children under 18 should never take aspirin due to the risk of a rare but serious condition called Reye’s syndrome. For other NSAIDs in children, always follow the guidance of a paediatrician.
According to Healthline’s overview of over-the-counter anti-inflammatory drugs, careful patient screening is essential before recommending NSAID therapy, particularly for older adults.
Safe Use of NSAIDs: Practical Tips for Canadians
Using NSAIDs wisely makes a big difference in how safe they are for you. Following a few simple guidelines helps reduce your risk of serious side effects. These tips apply whether you are picking up ibuprofen at a Shoppers Drug Mart or filling a prescription from your family doctor.
Use the lowest effective dose. Start with the smallest dose that controls your symptoms.
Take them for the shortest time needed. Avoid using NSAIDs daily for more than 10 days without medical guidance.
Take with food. Eating before or with your NSAID protects your stomach lining.
Avoid alcohol. Drinking alcohol while on NSAIDs greatly increases the risk of stomach bleeding.
Check for interactions. Ask your pharmacist about potential drug interactions before starting NSAIDs.
Do not double up. Never take two different NSAIDs at the same time.
Read the label. Many cold and flu medications already contain ibuprofen or other NSAIDs. Taking extras can lead to accidental overdose.
Many Canadians are surprised to learn that multi-symptom cold remedies often contain hidden NSAIDs. Always read labels carefully and ask your pharmacist if you are unsure.
When to See a Doctor
NSAIDs are widely available, but that does not mean you should always manage pain on your own. There are clear situations when professional medical advice is essential. In Canada, you have easy access to both your family doctor and walk-in clinics — both are great starting points for NSAID-related concerns.
See your family doctor or visit a walk-in clinic if you:
Need to take NSAIDs every day for more than one to two weeks
Notice dark or tarry stools, which may signal gastrointestinal bleeding
Experience chest pain, shortness of breath, or sudden swelling in your legs
Have worsening kidney problems or notice reduced urination
Develop a rash or signs of an allergic reaction after taking an NSAID
Are pregnant or planning to become pregnant
Have a chronic condition like arthritis and need a long-term pain management plan
Most provincial health plans in Canada cover visits to your family doctor for medication reviews. If you do not have a family doctor, walk-in clinics can assess your situation and help you manage NSAID use safely. Your pharmacist is also an excellent and underused resource — consultations are free and available without an appointment at most Canadian pharmacies.
In an emergency — such as signs of a heart attack, stroke, or severe gastrointestinal bleeding — call 911 or go to your nearest emergency department immediately. Do not wait.
What are NSAIDs used for?
NSAIDs are used to relieve pain, reduce inflammation, and lower fever. They treat a wide range of conditions, from everyday headaches and muscle aches to chronic diseases like rheumatoid arthritis and osteoarthritis. Many Canadians use NSAIDs both as over-the-counter remedies and as prescription medications for ongoing health conditions.
Are NSAIDs safe to take every day?
Taking NSAIDs every day carries real risks, especially for your stomach, kidneys, and heart. Short-term daily use may be appropriate under a doctor’s supervision, but long-term daily use should always be monitored by your family doctor. If you find yourself needing NSAIDs daily, book an appointment to discuss safer long-term pain management options.
What is the difference between NSAIDs and acetaminophen (Tylenol)?
NSAIDs reduce both pain and inflammation, while acetaminophen (sold as Tylenol in Canada) only reduces pain and fever — it does not fight inflammation. NSAIDs are better for conditions involving swelling, like arthritis or sprains, whereas acetaminophen is often preferred for people with stomach sensitivity or heart concerns. Your pharmacist or doctor can help you choose the right option.
Can NSAIDs damage your kidneys?
Yes, long-term or high-dose NSAID use can reduce blood flow to the kidneys and cause kidney damage over time. People with pre-existing kidney disease face the highest risk and should avoid NSAIDs unless specifically directed by their doctor. Staying hydrated and using the lowest effective dose for the shortest time possible helps protect kidney health.
Which NSAID is easiest on the stomach?
COX-2 selective NSAIDs, like celecoxib, are generally considered easier on the stomach than traditional NSAIDs like ibuprofen or naproxen. However, celecoxib requires a prescription in Canada and may carry a slightly higher cardiovascular risk. Taking any NSAID with food and asking your doctor about a stomach-protecting medication can also significantly reduce digestive side effects.
