Are You Taking Your Medication Correctly? 5 Prescription Pitfalls Canadians Should Know About

Most Canadians trust their prescriptions to work. They pick up the bottle, read the label, and assume that following the basic instructions is enough. But the gap between taking a medication and taking it correctly is wider than many people realise—and the consequences of that gap can range from reduced effectiveness to serious health complications.

The good news? Canadian pharmacists are exceptionally well-positioned to help. Across many provinces, expanded scopes of practice now allow pharmacists to do far more than count pills and process refills. They can adapt prescriptions, counsel on drug interactions, and in some provinces, even prescribe for certain conditions. Think of your pharmacist not as a dispensing machine, but as one of the most accessible health professionals in your community.

Below, we examine five of the most common medication mistakes seen among Canadian patients—and what you can do, with your pharmacist's help, to avoid them.

1. Mixing Prescription Drugs With Natural Health Products

Canada's natural health product market is substantial. From St. John's Wort to fish oil, melatonin to echinacea, millions of Canadians incorporate supplements into their daily routines. What many don't realise is that these products can interact meaningfully with prescription medications.

St. John's Wort, for instance, is a well-documented inducer of liver enzymes. It can significantly reduce the blood levels of drugs including certain antidepressants, anticoagulants like warfarin, and oral contraceptives—potentially rendering them less effective. Vitamin E and fish oil can amplify bleeding risk when combined with blood thinners. Even grapefruit, technically a food, can inhibit the metabolism of dozens of medications.

What to do: Before starting any supplement, natural remedy, or herbal product, bring the bottle to your pharmacist. At CanadaPharmJud, our team reviews your complete medication and supplement profile to flag potential interactions—something that can easily be missed when a supplement purchase happens at a health food store rather than a pharmacy.

2. Overlooking Over-the-Counter Drug Interactions

Because over-the-counter (OTC) medications don't require a prescription, many Canadians assume they're inherently safe to combine with whatever they're already taking. This assumption can be dangerous.

Consider ibuprofen—one of the most commonly purchased OTC pain relievers in Canada. For patients on certain blood pressure medications, particularly ACE inhibitors or angiotensin receptor blockers, regular ibuprofen use can blunt the drug's effectiveness and stress the kidneys. Similarly, antihistamines found in many cold and allergy products can compound sedation in patients taking anxiety medications or sleep aids.

Even something as routine as an antacid can interfere with the absorption of thyroid medications, certain antibiotics, and some cardiac drugs if taken too close together.

What to do: Before reaching for an OTC product, check in with your pharmacist. In most Canadian provinces, pharmacists can review your prescription profile and advise you on which OTC options are safe, which to avoid entirely, and which simply require careful timing.

3. Ignoring Food and Timing Instructions

The instruction "take with food" or "take on an empty stomach" isn't arbitrary. These directions reflect real pharmacological considerations—and ignoring them can affect how much of the drug your body actually absorbs.

Certain antibiotics, for example, are best absorbed on an empty stomach because food slows their uptake. Conversely, medications like metformin (commonly used for type 2 diabetes) are typically taken with meals to reduce gastrointestinal side effects. Bisphosphonates, used to treat osteoporosis, must be taken with a full glass of water and the patient must remain upright for at least 30 minutes afterward to prevent oesophageal irritation.

Timing also matters beyond food. Some medications are most effective at specific times of day due to the body's circadian rhythms. Statins, for instance, are often recommended in the evening because cholesterol synthesis peaks overnight.

What to do: When you pick up a new prescription, ask your pharmacist to walk you through the optimal timing and any food considerations. Don't rely solely on the printed label—verbal counselling from a pharmacist ensures you understand the reasoning, which makes you more likely to follow through consistently.

4. Stopping Medication Early or Skipping Doses Due to Cost

This is one of the most quietly prevalent medication problems in Canada, and it carries real health consequences. When a prescription is expensive, patients sometimes ration doses, split schedules without medical guidance, or simply stop taking the medication before the course is complete.

For antibiotics, stopping early can contribute to antibiotic resistance and allow infections to rebound. For chronic condition medications—antihypertensives, antidepressants, thyroid drugs—inconsistent use can destabilise conditions that were previously well managed. In some cases, abrupt discontinuation (particularly with certain psychiatric medications or corticosteroids) can trigger withdrawal effects.

Cost-related non-adherence is a documented public health concern in Canada, particularly among patients without comprehensive drug coverage or those in the gap between income thresholds for provincial assistance.

What to do: If cost is a barrier, say so—directly, to your pharmacist. This is not a conversation to be embarrassed about. Pharmacists can explore generic alternatives, identify provincial assistance programs (such as Ontario's Trillium Drug Program, Alberta's Seniors Drug Benefit, or BC's Fair PharmaCare), and connect you with manufacturer patient support programs. At CanadaPharmJud, we treat affordability as part of comprehensive care, not a separate conversation.

5. Failing to Update Your Pharmacist After Seeing Multiple Prescribers

In today's healthcare landscape, it's common for a patient to see a family physician, a specialist, a walk-in clinic, and perhaps an urgent care provider—all in the same year. Each prescriber may add a medication to the mix without full visibility into what the others have prescribed.

This fragmentation creates a real risk of polypharmacy—the simultaneous use of multiple medications that may interact, duplicate effects, or collectively increase side effect burden. Older Canadians are particularly vulnerable, as the likelihood of seeing multiple specialists increases with age and complexity of health conditions.

What to do: Treat your pharmacy as your medication home base. When all your prescriptions flow through a single pharmacy, your pharmacist maintains a complete medication record and can spot interactions or duplications that no individual prescriber may catch. If you do use multiple pharmacies for any reason, request a Medication Review—a formal service available through many Canadian pharmacists, sometimes covered by provincial programs, in which your full medication list is assessed for safety and optimisation.

Medication safety isn't a passive process. It requires active engagement—from your prescribers, yes, but also from you and from the pharmacist who stands ready to bridge the gap between what's prescribed and what's actually working for you.

At CanadaPharmJud, our commitment is to be that bridge. Whether you have a question about a new prescription, a concern about something you've been taking for years, or simply want to know if your supplement routine is safe to continue, our pharmacists are here—not just to dispense, but to genuinely help.