Antibiotics for UTI: Which Ones Work and How to Get Them Online

If you think you might have a urinary tract infection (UTI), the first thing to do is see a doctor to confirm whether you need treatment with antibiotics. In most cases, treatment is reasonably straightforward, and you’ll feel better in a few days.

Because a UTI can usually be diagnosed from your symptoms, you often don’t need an in-person appointment to get treated. An online doctor can assess you from home, and if appropriate, send a prescription for antibiotics and arrange any follow-up tests that may be required. Starting treatment sooner rather than later matters, since the earlier a UTI is treated, the less chance it has to get worse or spread to your kidneys.

This article covers the antibiotics commonly used for a UTI, how long they take to work, and how to get UTI antibiotics in Canada. For a detailed overview of UTI symptoms, causes, and prevention, see our guide to UTI symptoms and treatment.

An Overview of UTI Antibiotics

A UTI is a bacterial infection, usually of the bladder, that develops when bacteria travel up the urinary tract and multiply. Because bacteria are behind a UTI, antibiotics are the mainstay of treatment, clearing the infection at its source and easing common symptoms like burning and urgency.

For an uncomplicated UTI, the course of antibiotics is usually short, with treatment lasting around five to seven days. Which antibiotic a doctor prescribes can vary by province, since local resistance patterns in Canada differ. Either way, most people start to feel better within a day or two of starting treatment.

In Canada, UTI antibiotics are prescription-only. While there are some over-the-counter products that claim to ease the symptoms of a UTI, antibiotics are the only treatment that reliably clears the infection. A milder UTI may settle on its own. However, because there is a risk of the infection reaching your kidneys, it’s always best to see a doctor if you think you have a UTI.

Which Antibiotics Are Used to Treat a UTI?

Most uncomplicated UTIs are treated by a doctor prescribing one of three antibiotics, all of which are known to reliably clear the infection with minimal side effects. The antibiotics for UTI treatment used most often in Canada are:

• Nitrofurantoin (Macrobid, Macrodantin) — A common first choice for a simple UTI, usually taken twice a day for five to seven days. Nitrofurantoin concentrates in the urine where the infection is, which helps reduce side effects.
• Trimethoprim-sulfamethoxazole (Septra, Bactrim) — Usually a shorter, three-day course. Trimethoprim-sulfamethoxazole is a long-established option, but rising bacterial resistance means it isn’t the right choice everywhere, so a doctor will weigh local resistance patterns before prescribing it.
• Fosfomycin (Monurol) — Taken as a single dose dissolved in water. The convenience of one-and-done treatment is the main appeal, and fosfomycin is often used when the more common antibiotics aren’t a good fit.

Due to rising antibiotic resistance and side-effect profiles, some of the antibiotics once prescribed routinely in Canada now play more of a back-up role. For example, amoxicillin works against fewer of the bacteria that cause UTIs than it used to, and Health Canada has warned of rare but serious side effects with fluoroquinolones, such as ciprofloxacin. Both are now generally reserved for infections confirmed susceptible by a urine culture, or when infection has reached the kidneys.

Which antibiotic is first-line can also vary from province to province, because bacteria build resistance at different rates in different places. In British Columbia, for example, resistance is high enough that trimethoprim-sulfamethoxazole is not recommended as a first treatment, and nitrofurantoin is preferred.

Best Antibiotic for a UTI

For an uncomplicated UTI in an otherwise healthy adult woman, nitrofurantoin is often the best first choice. It usually clears the usual UTI bacteria well, and antibiotic resistance is generally low. 

Even so, there’s no single best antibiotic for a UTI that suits everyone. The right treatment depends on your:

• Medical history
• Allergies
• Whether you’re pregnant
• How well your kidneys are working
• Gender (UTIs in men usually call for a different or longer course of antibiotics)
• Any previous urine-culture results

A quick check with a doctor is the best way to decide which UTI antibiotic is right for you.

How Long UTI Antibiotics Take to Work

Antibiotics don’t work instantly, but relief usually comes relatively quickly. Most people notice their symptoms easing within a day or two of starting treatment, with the burning on urination often settling first, followed by the urgency and frequency. 

Even once you feel better, it’s important to finish the full course of UTI antibiotics, since stopping early can let the infection return and makes resistance more likely.

The signs your UTI is going away with antibiotics are:

• Less pain when you pee
• Fewer sudden urges to go to the toilet
• Urine that looks clearer and smells more normal

If your symptoms haven’t improved after about two days on antibiotics, or they return soon after you finish, it’s best to see a doctor — you may need a urine culture to find out which antibiotic will clear the infection.

Important: Fever, chills, back or side pain, and nausea or vomiting from a UTI can mean the infection has reached your kidneys. That’s more serious and needs prompt in-person medical care, even if you are already taking antibiotics.

Do You Always Need Antibiotics for a UTI?

Not every UTI needs antibiotics. Research suggests a third to half of uncomplicated UTIs resolve on their own within a week or two. The catch is, there’s no reliable way to tell in advance if your UTI will settle without treatment.

Skipping antibiotics for a UTI raises the risk of the infection spreading to the kidneys, which is why UTI treatment without antibiotics isn’t a dependable plan for most people. Over-the-counter products such as urinary pain relievers can take the edge off while you wait, but they don’t clear the bacteria.

How to Get Antibiotics for a UTI in Canada

Because a UTI can usually be diagnosed from your symptoms alone, getting treated doesn’t have to mean a trip to a clinic. An online doctor can assess most UTIs over a video or phone consultation, and where appropriate, send an antibiotic straight to your pharmacy.

Here’s how it typically works:

• Book an online appointment. Same-day slots are often available at telehealth clinics, so you can be seen quickly.

• Speak with a Canadian-licensed doctor. They’ll ask about your symptoms, your history, and anything that points to a more serious infection.

• Get your prescription. For an uncomplicated UTI, treatment is usually a first-line antibiotic like nitrofurantoin. The prescription can be sent to your pharmacy or may be forwarded directly to you.

• Do a urine test if it’s needed. If your case is less clear-cut, the doctor can order a urine culture and may adjust the antibiotic once the results are back.
• Follow up if you’re not improving. If symptoms haven’t eased in a couple of days, a follow-up appointment can sort out the next steps.

If you’re in British Columbia, appointments with Walk In’s online doctors are covered by MSP. Just click ‘Book Now’ to get started.

Can a Pharmacist Prescribe Antibiotics for a UTI?

In a number of provinces, pharmacists can now assess and prescribe treatment for a UTI. A pharmacist can only treat straightforward cases, so if there are any risks or complications, they’ll advise you to see a doctor. Also, the assessment must be done in person at the pharmacy.

An online doctor can handle both simple and more complex cases of UTI, without the trip to the pharmacy (and often at no cost). For many people, that makes seeing a doctor online the simplest place to start for UTI treatment.

Frequently Asked Questions About UTI Antibiotics

Can you drink alcohol on UTI antibiotics?

For the antibiotics most commonly used for UTIs, like nitrofurantoin, there’s no serious interaction with alcohol. That said, alcohol can worsen side effects like nausea and add to dehydration, so it’s sensible to go easy while your body is fighting an infection.

Can I take probiotics with antibiotics for a UTI?

There’s moderate but mixed evidence that certain probiotic strains ease antibiotic-associated diarrhea, but probiotics won’t help clear the UTI itself. While probiotics are safe for most healthy people, anyone who’s seriously ill or immunocompromised should check with a doctor first.

Why has my UTI come back right after antibiotics?

A UTI that returns soon after treatment can mean the original infection wasn’t fully cleared, or that a new one has taken hold. Rather than repeating the same antibiotic on your own, it’s worth seeing a doctor, who may take a urine culture to find out exactly what’s going on. If you’re getting UTIs often (three or more in a year), a doctor can also help with a longer-term plan.

Can you get UTI antibiotics over the counter in Canada?

UTI antibiotics are prescription-only in Canada, so there’s no over-the-counter version. The quickest way to get a prescription is via an online doctor or virtual walk in clinic.

Should You See an Online Doctor for UTI Antibiotics?

The sooner you start the right antibiotics for a UTI, the less chance the infection has to drag on or reach the kidneys. For an uncomplicated UTI, a short course of treatment is generally all that’s required. The important part is speaking with a doctor early, rather than waiting to see if the UTI clears on its own.

Because a UTI can usually be diagnosed from your symptoms alone, it’s one of the easier conditions to sort out with an online doctor’s visit. If you think you have a UTI, a doctor can confirm whether you need antibiotics, and if so, get you started on the right one.

Speak to a Doctor Online About UTI Treatment