Aspirin (ASA) in Canada: Uses, Risks, and When to Be Careful

Not typically. For everyday pain relief — headaches, muscle aches, or minor injuries — ibuprofen is generally more effective for pain involving inflammation, and acetaminophen is a gentler choice when inflammation isn't the main issue. Aspirin sits in an awkward middle ground: it's an NSAID like ibuprofen, but carries a higher bleeding risk and is more commonly used today for cardiovascular therapy than as a first-line pain reliever. In most cases, either acetaminophen or ibuprofen is a better choice for pain. Ask a pharmacist if you're not sure which fits your situation.

Not without guidance from a doctor or pharmacist. Daily aspirin used to be widely recommended for heart disease prevention, but current Canadian and international guidelines have shifted significantly. For most people without a prior heart attack or stroke, the bleeding risks of daily aspirin outweigh the cardiovascular benefit. Daily low-dose aspirin (75–100 mg) is still used for secondary prevention — meaning in people who have already had a confirmed cardiovascular event — but this should be decided by a physician, not self-started.

Low-dose aspirin (typically 75–100 mg, sometimes called 'baby aspirin' — though that term is misleading since it should never be given to children) works by permanently reducing platelet function, making blood less likely to clot. It's primarily prescribed for secondary cardiovascular prevention: reducing the risk of a repeat heart attack or stroke in people who've already had one. It's sometimes used in other specific situations — like atrial fibrillation management or certain high-risk pregnancy complications — always under medical supervision.

Aspirin carries a rare but serious risk of Reye's syndrome in children and teenagers — especially when taken during a viral illness like influenza or chickenpox. Reye's syndrome causes swelling of the liver and brain and can be life-threatening. This is why acetaminophen and ibuprofen have largely replaced aspirin for fever and pain in anyone under 18. Never give aspirin to a child without explicit direction from a physician.

Yes — and this is one of the most important things to understand about aspirin. Because it permanently reduces the ability of platelets to clump together, it increases bleeding risk throughout the body. The most common and concerning form is GI bleeding — which can occur without obvious symptoms until it's serious. Bruising more easily, cuts that bleed longer, and (at high doses) blood in the urine or stool are all aspirin-related. This is why starting or continuing daily aspirin should involve an informed conversation with your pharmacist or doctor.

Only under close medical supervision — and never self-initiated. Combining aspirin with anticoagulants like warfarin, apixaban (Eliquis), or rivaroxaban (Xarelto) significantly raises the risk of serious bleeding. In some specific cardiovascular situations (e.g., after certain stent procedures), dual antiplatelet therapy is intentionally prescribed — but this decision belongs with your cardiologist or physician. If you're unsure whether your heart medication and aspirin are compatible, bring both bottles to Pill4Me and we'll check.

Standard aspirin tablets in Canada are typically 325 mg — used for pain, fever, or occasional use. Low-dose aspirin is typically 75–100 mg, formulated specifically for daily cardiovascular therapy. The lower dose is enough to achieve the antiplatelet (blood-thinning) effect while causing somewhat less stomach irritation than standard doses — though the GI risk is still present. Enteric-coated (EC) aspirin is sometimes marketed as easier on the stomach, though the evidence on this is mixed.

Regular or high-dose aspirin is not recommended during most of pregnancy — especially in the third trimester, where it can affect fetal circulation and increase bleeding risk. Low-dose aspirin (81 mg) is sometimes prescribed by a physician for specific high-risk situations, such as preeclampsia prevention. This is a medical decision, not an OTC self-care one. If you're pregnant and considering aspirin for any reason, speak to your physician or pharmacist first.