Antibiotics have transformed modern medicine. They allow us to treat bacterial infections that once caused serious illness or death and help make procedures such as surgery, cancer treatment and organ transplantation safer. But their effectiveness cannot be taken for granted.
Antibiotic resistance in Canada is an important and growing public-health concern. Resistance occurs when bacteria change in ways that allow them to survive medicines designed to kill them or stop their growth. It’s not the person taking the antibiotic that becomes resistant, it’s the bacteria that does.
Antibiotic resistance is a natural biological process, but the way antibiotics are used can accelerate it. The more opportunities bacteria have to encounter antibiotics, the greater the opportunity for resistant strains to survive and spread.
The goal is not to avoid antibiotics when we need them. These medicines remain essential. Instead, we can protect their effectiveness by using them appropriately, preventing infections whenever possible and following the advice of healthcare professionals.
How Antibiotic Resistance Develops
Bacteria are constantly changing and evolving. Occasionally, a bacterium develops a genetic change or acquires resistance genes that allow it to survive exposure to a particular antibiotic.
When an antibiotic is used, bacteria that are susceptible to the medication may be killed or prevented from multiplying. Bacteria with resistant characteristics, however, may survive. Those survivors can then reproduce and potentially pass resistance traits to other bacteria.
This process is sometimes described as “selection pressure.” The antibiotic does not deliberately make an individual bacterium resistant. Instead, antibiotic exposure can create conditions that favour bacteria already able to withstand the medication.
This is why responsible antibiotic use matters. Antibiotics are essential medicines, and appropriate treatment can be lifesaving. Antimicrobial resistance (AMR) stewardship is about using these medications carefully so they continue working for people who need them today and in the future.
When Antibiotics Are Used Unnecessarily
Every use of an antibiotic can contribute to selection pressure, which makes avoiding unnecessary or inappropriate use especially important.
Examples can include:
- Taking antibiotics for viral illnesses, such as most colds and influenza.
- Requesting antibiotics “just in case” when there is no clear clinical need.
- Using a broader-spectrum antibiotic when a more targeted option is appropriate.
- Using an inappropriate antibiotic, dose or treatment duration.
- Taking leftover antibiotics from a previous illness.
- Taking medication that was prescribed for someone else.
The appropriate antibiotic can also vary from one infection to another. A medication that worked for a previous infection may not be appropriate the next time you become ill.
Resistance Can Develop Beyond Human Healthcare
Antimicrobial resistance is not solely a human healthcare issue. Antibiotics are also used in veterinary medicine and animal agriculture to treat and control bacterial infections.
Because people, animals and the environment are interconnected, antimicrobial use in one area can have implications elsewhere. Resistant bacteria and resistance genes can potentially move between populations through direct contact, food and environmental pathways.
This interconnected relationship is one reason Canada approaches antimicrobial resistance through a concept known as One Health, which considers human, animal and environmental health together. 
Where Resistant Bacteria Spread
Hospitals and Other Healthcare Settings
Healthcare facilities can be particularly vulnerable to antibiotic-resistant organisms. Antibiotics are used frequently, patients may have weakened immune systems, and procedures such as surgery, catheterization or intravenous therapy can provide opportunities for bacteria to enter the body.
Close contact among patients, healthcare workers and shared environments can also contribute to transmission if appropriate infection-control practices are not followed.
Measures such as hand hygiene, environmental cleaning, appropriate antibiotic prescribing and infection-control procedures all play an important role in reducing transmission.
Resistant Infections Can Also Begin in the Community
Some resistant infections are acquired in the community. Depending on the organism, bacteria may spread through close personal contact, contaminated surfaces or environments where people are in frequent close contact. This means antibiotic resistance affects everyone, not just those receiving hospital care.
Good hygiene, proper wound care, appropriate infection prevention and responsible antibiotic use can all help reduce opportunities for resistant bacteria to spread.
Food, Animals and the Environment
Resistant bacteria and resistance genes can move among humans, animals, food and the environment. Water, soil and wastewater are among the environmental pathways researchers and public-health authorities study. For example, bacteria and antimicrobial residues can enter wastewater systems from households, healthcare facilities, farms and other sources.
These connections demonstrate why antibiotic resistance cannot be addressed by focusing on prescriptions alone. Monitoring antimicrobial use and resistance across multiple sectors is an important part of Canada’s response.
What Canada’s Resistance Data Are Showing
Resistant Infections Already Carry a Significant Burden
Canadian estimates have associated antimicrobial resistance with thousands of deaths and substantial healthcare costs. Resistant infections can require longer hospital stays, additional diagnostic testing and more complex treatments.
The exact burden continues to be monitored and updated as surveillance methods and resistance patterns evolve. What is clear is that antimicrobial resistance has become a significant public-health issue requiring coordinated action.
Resistant Organisms Canadian Health Officials Are Watching
Canada monitors numerous resistant organisms and infections, including:
- Carbapenemase-producing Enterobacterales (CPE)
- Drug-resistant Neisseria gonorrhoeae
- Drug-resistant Streptococcus pneumoniae (Invasive Pneumococcal Disease (IPD)
- Methicillin-resistant Staphylococcus aureus (MRSA).
- Vancomycin-resistant Enterococcus (VRE).
- Multidrug-resistant Streptococcus pneumoniae.
- Other emerging organisms showing concerning resistance patterns.
Different organisms present different challenges, and resistance patterns can vary geographically and over time. This makes ongoing surveillance particularly important.
Why Surveillance Matters
Canada’s surveillance systems help public-health officials understand where resistance is occurring, how patterns are changing and how antimicrobials are being used.
The Canadian Antimicrobial Resistance Surveillance System (CARSS) integrates information from different surveillance programs to provide a broader picture of antimicrobial use and resistance.
Monitoring extends beyond human healthcare. Canada’s One Health approach also considers antimicrobial use and resistance involving animals, food production and environmental pathways.
Better information can help healthcare professionals, researchers and governments identify emerging threats and develop more effective prevention and stewardship strategies.
In fact, every year from November 18 to 24 is World Antimicrobial Resistance Week, a global campaign to help raise awareness and how to prevent it.
Why Antibiotic Resistance Matters Beyond a Difficult Infection
Fewer Treatment Options
When bacteria become resistant to commonly used antibiotics, healthcare providers may have fewer treatment options available.
Alternative medications may be more expensive, have additional side effects, be less convenient to take or require intravenous administration rather than an oral tablet or capsule.
Additional laboratory testing may also be needed to identify the organism and determine which antibiotics are likely to remain effective.
Longer Illnesses and More Complex Care
A resistant infection can make treatment more complicated.
Depending on the infection and individual patient, consequences may include:
- Longer recovery periods.
- Additional medical appointments.
- Longer hospital stays.
- More diagnostic testing.
- Greater risk of complications.
- More complex medication regimens.
- Increased healthcare costs.
For vulnerable patients, including older adults, people with chronic conditions and individuals with weakened immune systems, difficult-to-treat infections may be particularly concerning.
Modern Medicine Depends on Effective Antibiotics
Antibiotics do much more than treat common bacterial infections.
Many areas of modern healthcare rely on effective antimicrobials to prevent or manage infections.
These include:
- Surgery
- Cancer chemotherapy
- Organ transplantation
- Joint replacement
- Intensive care
- Treatment of people with weakened immune systems
Protecting antibiotic effectiveness therefore supports much more than infection treatment. It helps protect many of the medical treatments and procedures we rely on.
When Antibiotics Help and When They Usually Do Not
Bacterial Infections May Require Antibiotics
Antibiotics treat bacterial infections, but not every bacterial infection automatically requires antibiotic treatment.
A healthcare professional may consider the suspected bacteria, location and severity of the infection, your overall health, allergies, previous treatments and local resistance patterns before recommending an antibiotic.
In some situations, testing may help identify the bacteria involved and determine which medication is most appropriate.
Why a Healthcare Provider May Recommend Waiting
Sometimes the safest and most appropriate recommendation is to monitor symptoms rather than immediately start an antibiotic.
A healthcare provider may recommend watchful waiting or treatment focused on relieving symptoms when an infection is likely to resolve without antibiotics or appears to be viral.
Not receiving an antibiotic does not mean your symptoms are being ignored. It may mean your healthcare provider has determined that an antibiotic is unlikely to provide meaningful benefit.
Colds and influenza, for example, are caused by viruses. Antibiotics do not kill viruses and generally will not make these illnesses resolve faster. 
Using Antibiotics Responsibly Without Being Afraid of Them
Take Antibiotics Exactly as Directed
When an antibiotic is prescribed, follow the instructions provided by your prescriber and pharmacist.
That includes:
- Taking the prescribed dose at the recommended times.
- Asking what to do if you miss a dose.
- Following current instructions regarding treatment duration rather than independently stopping early or extending treatment.
- Checking whether the medication should be taken with or without food.
- Asking about possible interactions with medications, supplements or certain foods.
- Contacting a healthcare professional if symptoms worsen or you experience unexpected side effects.
Commonly prescribed antibiotics include medications from several different classes, such as amoxicillin, azithromycin, cephalexin, doxycycline, and nitrofurantoin. Each works differently and may be appropriate for different types of bacterial infections. There is no single antibiotic that is “best” for every infection.
Never Share or Save Antibiotics for Later
Your antibiotic prescription is selected for your specific circumstances. An antibiotic prescribed for a previous infection may not treat the bacteria causing your current illness. Using leftover medication can also result in the wrong drug, dose or treatment duration.
Never share prescription antibiotics with another person. If you have unused medication, ask your pharmacy about disposal options available in your community, rather than keeping antibiotics for future illnesses or throwing them in the garbage or flushing them.
Ask Questions About Your Treatment
You should feel comfortable asking questions when an antibiotic is prescribed.
Useful questions include:
- What infection are we treating?
- Is an antibiotic necessary?
- How should I take this medication?
- Should I take it with food?
- Could it interact with my other medications?
- What side effects should I watch for?
- What should I do if I miss a dose?
- When should I expect to feel better?
- What should I do if my symptoms do not improve?
Understanding why you are taking an antibiotic and how to use it correctly can help you get the greatest benefit from your treatment.
Prevention Is One of Canada’s Strongest Defences
Reduce the Chance of Infection in the First Place
One of the simplest ways to reduce antibiotic use is to prevent infections whenever possible.
Practical steps include:
- Washing your hands regularly and properly.
- Staying home when appropriate when you have an infectious illness.
- Practising safe food preparation and storage.
- Cleaning and caring for wounds properly.
- Following infection-control recommendations in healthcare settings.
- Avoiding sharing personal items when infection transmission is a concern.
These everyday behaviours can reduce the spread of both antibiotic-susceptible and antibiotic-resistant bacteria.
Keep Recommended Vaccinations Up to Date
Vaccination is another important part of infection prevention.
Vaccines can prevent certain infections that might otherwise require antimicrobial treatment. Preventing viral illnesses can also help reduce some secondary bacterial complications that may occur following an initial infection.
Which vaccines are recommended depends on factors such as age, health conditions, occupation, travel and vaccination history.
Ask your pharmacist or another healthcare professional which vaccinations may be appropriate for you and whether you are up to date.
Canada’s One Health Strategy Connects People, Animals and the Environment
Antibiotic Resistance Does Not Stay in One Sector
One Health recognizes that human health, animal health and environmental health are closely connected.
Resistant organisms can potentially move among these sectors. Antimicrobials and resistant bacteria can also enter environmental systems, including water and soil.
Looking at antibiotic resistance through a One Health lens helps researchers and public-health authorities understand how resistance develops and spreads across interconnected systems rather than treating each sector as an isolated problem.
Canada’s Response Requires More Than Better Prescribing
Responsible prescribing is important, but addressing antimicrobial resistance requires action at many levels.
Canada’s response includes:
- Antimicrobial stewardship.
- Surveillance.
- Infection prevention and control.
- Research and innovation.
- Responsible antimicrobial use in human and veterinary medicine.
- Public and healthcare-provider education.
- Collaboration across healthcare, agriculture, research and government.
The Pan-Canadian Action Plan on Antimicrobial Resistance provides a framework for coordinated action among federal, provincial and territorial governments and other partners.
Reducing resistance requires sustained collaboration because resistant organisms do not respect provincial, national or sector boundaries.
Your Pharmacist Can Help Protect Antibiotics for the Future
Pharmacists are accessible healthcare professionals who can help patients use antibiotics safely and appropriately.
Depending on the province and their scope of practice, pharmacists may also assess and help manage certain health conditions or advise when further medical evaluation is appropriate.
Your pharmacist can also help if you are uncertain about your treatment. Rather than stopping an antibiotic, extending treatment or changing the dose yourself, ask your pharmacist or prescriber what you should do.
Keeping Antibiotics Effective Is a Shared Responsibility
We cannot completely eliminate antibiotic resistance. Bacteria naturally evolve, and some level of resistance will continue to emerge.
What we can do is reduce unnecessary antibiotic exposure and slow the development and spread of resistance.
That requires coordinated action from patients, pharmacists, prescribers, veterinarians, researchers, governments, healthcare organizations, agriculture and industry.
Protecting antibiotics does not mean being afraid to use them. It means using them wisely so these important medicines remain effective when we truly need them.
People Also Ask
Is antibiotic resistance a problem in Canada?
Yes. Antimicrobial resistance is an established public-health concern in Canada. Canadian surveillance programs monitor resistant infections and antimicrobial use to identify trends and emerging threats.
Can my body become resistant to antibiotics?
No. Bacteria become resistant to antibiotics, not your body.
Does Taking Antibiotics Too Often Cause Resistance?
Antibiotic exposure creates selection pressure that can favour resistant bacteria. This is why unnecessary or inappropriate antibiotic use can contribute to the development and spread of resistance.
However, this does not mean you should avoid an antibiotic that is medically appropriate. When antibiotics are needed, using them as directed is important.
Do Antibiotics Work for Colds and the Flu?
No. Colds and influenza are caused by viruses, while antibiotics target bacteria. Taking antibiotics for a viral infection will not treat the virus and can expose you to unnecessary side effects while contributing to antibiotic selection pressure.
Can Antibiotic-Resistant Infections Still Be Treated?
Often, yes, but treatment may be more complex. Healthcare professionals may use laboratory testing to determine which antibiotics remain effective. In some cases, treatment may require alternative medications, combinations of medications or intravenous antibiotics.
Final Key Points About Antibiotic Resistance in Canada
Antibiotics remain some of the most valuable medicines available to us. Protecting them is not about avoiding treatment; it is about making sure the right antibiotic is used for the right reason, at the right dose and for the appropriate duration.
If you have questions about antibiotic resistance, want to learn more, or have questions about your own medication, visit your local PharmaChoice pharmacy today!