Yes — a walk-in physician can prescribe any antibiotic a family doctor can, and does so every day for strep throat, urinary infections, skin infections, dental abscesses, pneumonia and more. What they will not do is prescribe one for a viral illness, because antibiotics do nothing against viruses and carry real risks. A doctor declining antibiotics for a cold is giving you correct treatment, not refusing care — and “the walk-in wouldn’t give me anything” usually means “the walk-in correctly diagnosed a virus.” The useful question to ask is not can I have antibiotics, but what is this, how long should it last, and what should bring me back?
When antibiotics are prescribed
| Condition | Usually treated with antibiotics |
|---|---|
| Strep throat, confirmed by swab or clinical score | Yes |
| Urinary tract infection | Yes |
| Kidney infection | Yes, urgently |
| Skin infection or cellulitis | Yes |
| Abscess or boil | Often, alongside drainage |
| Dental abscess | Yes, while you arrange a dentist |
| Bacterial pneumonia | Yes |
| Infected wound or bite | Often |
| Bacterial conjunctivitis | Sometimes |
| Impetigo | Yes |
| Bacterial sinus infection after an extended course | Sometimes |
| Some sexually transmitted infections | Yes |
| Whooping cough | Yes |
| Middle ear infection in certain cases | Sometimes — depends on age and severity |
When antibiotics are not prescribed
| Illness | Why not |
|---|---|
| Common cold | Viral. Antibiotics have no effect |
| Flu | Viral. Antiviral medication is a different thing, and is time-limited |
| COVID-19 | Viral |
| Most sore throats | The majority are viral — a swab or score decides |
| Most coughs and bronchitis | Usually viral, and a cough lasting two to three weeks is normal after a virus |
| Most sinus congestion in the first week | Usually viral, and resolves on its own |
| Stomach flu, most vomiting and diarrhoea | Usually viral, and antibiotics can make it worse |
| Green phlegm | Not a sign of bacterial infection. It reflects immune cells, not bacteria |
| Fever alone | Fever is the body’s response to infection of any kind |
| “To be on the safe side” | Not safe — see the risks below |
The biggest myth: green or yellow mucus means you need antibiotics. It does not. Colour changes in almost every viral illness and tells a clinician very little.
Why “just in case” is not harmless
An unnecessary antibiotic is not a neutral act.
- Side effects are common — diarrhoea, nausea, rash, thrush, and occasionally severe allergic reactions.
- C. difficile infection is a serious, sometimes dangerous bowel infection caused largely by antibiotic use.
- Your own bacteria become resistant, so the antibiotic you actually need later may not work.
- Interactions — antibiotics interact with blood thinners, some heart medications and others.
- It masks the real diagnosis. If you feel better in three days from a virus, the antibiotic gets the credit and the pattern repeats.
- Community resistance grows. Resistant infections are already one of the most serious threats in medicine, and every unnecessary course contributes.
The honest framing: a doctor who prescribes an antibiotic you do not need has taken the easier path. One who explains why you do not need it has done the harder, better job.
How a doctor decides
| Tool | What it does |
|---|---|
| History | How long, what pattern, whether it is improving or worsening |
| Examination | Looking in the throat and ears, listening to the chest, checking the skin |
| Rapid strep swab | Distinguishes bacterial from viral sore throat |
| Urine dip and culture | Confirms a urinary infection, and which antibiotic will work |
| Chest X-ray | Distinguishes pneumonia from bronchitis |
| Bloodwork | Markers of bacterial infection |
| Wound swab | Identifies the organism and sensitivities |
| Duration | Many bacterial infections declare themselves by worsening after a week, when a virus should be improving |
Duration is often the key. A sinus congestion on day three is almost certainly viral. The same congestion still worsening on day twelve is a different conversation — which is precisely why “come back if it is not improving” is clinically meaningful advice, not a brush-off.
The middle ground: a delayed prescription
Sometimes a doctor will give you a prescription with instructions not to fill it unless things change — for example, if you are not improving in three days, or if a specific symptom appears.
This is a recognised approach, and it is a good one. It means:
- You do not take antibiotics you probably do not need
- You do not need a second visit if things worsen
- You get clear criteria for when to start
If you are offered this, take it seriously. Ask exactly what should trigger filling it.
If you are told no
Three questions turn a frustrating visit into a useful one:
- “What do you think this is?”
- “How long should this last before I should worry?”
- “What specifically should bring me back?”
And one more if you want it: “Would a delayed prescription be reasonable here?”
What you should get instead of an antibiotic:
- A diagnosis
- An expected timeline
- Symptom relief — fluids, rest, paracetamol or ibuprofen, saline, throat remedies
- Clear return criteria
- A test, if one would change the answer
If you get none of that, you are entitled to ask for it, or to be seen again.
Taking antibiotics properly
- Take the full course as prescribed unless your clinician tells you to stop. Stopping early because you feel better is how resistance develops
- Do not save leftovers for next time
- Never take someone else’s antibiotics, or ones left from a previous illness
- Do not share them
- Follow food and timing instructions — some need an empty stomach, some do not
- Tell the prescriber every medication you take, including the pill and supplements
- Report your allergies accurately, and what the reaction actually was — a stomach upset is not the same as a true allergy, and that distinction opens up safer options
- Return promptly if you are not improving in 48–72 hours — the choice may need changing
- Go back urgently for a spreading rash, severe diarrhoea, or any breathing difficulty while taking them
What else a walk-in can prescribe
Antibiotics are only part of it:
- Antivirals for shingles, cold sores, and influenza within the treatment window
- Antifungals for thrush and fungal skin infections
- Inhalers and steroids for asthma and COPD flares
- Eye and ear drops
- Pain relief, including short courses of stronger analgesia where appropriate
- Contraception, and emergency contraception
- Anti-nausea medication
- Creams for eczema, dermatitis and rashes
- Short bridging supplies of your regular medications
- A first prescription for a mental health condition, with referral
FAQ
Can a pharmacist prescribe antibiotics?
Ontario pharmacists can assess and prescribe for a defined list of minor ailments, which includes some infections such as urinary tract infections and pink eye. Ask your pharmacist — no appointment, no queue.
Can a nurse practitioner prescribe antibiotics?
Yes, within their scope of practice.
Can I get antibiotics over the phone or virtually?
For some clearly recognisable conditions, sometimes — a recurrent urinary infection, for instance. For anything needing examination, no. A throat cannot be assessed over the phone.
Why did one clinic give me antibiotics and another refuse?
Different presentations and different days. The illness on day two looks different from the illness on day ten, and clinicians do vary. Neither is necessarily wrong.
Can I just ask for a prescription without an appointment?
No. An antibiotic requires an assessment, which requires a visit.
Will arguing help?
It will not change the medicine, and it costs you the conversation that would have helped. Asking the three questions above achieves far more.
I get the same infection every year and I know what works.
Say exactly that — it is useful information. Recurrent infections are often managed differently, sometimes with a standing plan from your own doctor. Mention it and ask about one.
What if I am travelling and want antibiotics as a precaution?
That is a travel health consultation, not a walk-in request. Some travellers are prescribed a standby course for specific destinations, assessed properly in advance.
Infections, assessed properly
Milton Health Centre’s walk-in clinic can swab, test, examine and treat — and prescribe antibiotics when they are the right answer. If you need travel health advice or ongoing management of recurrent infections, our family practice handles that too. Hours and services at Milton Health Centre.
Related reading
- What a Walk-In Clinic Can Treat the Same Day
- What Actually Happens During a Walk-In Appointment
- Is This Fever an Emergency or a Walk-In Visit?
- How to Describe Your Symptoms So Nothing Gets Missed
This article provides general health information for Ontario residents and is not medical advice. Prescribing decisions depend on individual assessment. Always follow the instructions given by your own clinician and pharmacist. If you believe you are having a medical emergency, call 911. For health advice at any hour, call Health811 at 811.