Flu Treatment: Antivirals, Self-Care, and How to See a Doctor Online

The flu (influenza) has a way of arriving all at once. You can feel fine in the morning, and by mid-afternoon, be flattened by fever, aching muscles, and a cough that seemed to come from nowhere. For most people, it’s a rough few days, so the urge to find something that speeds recovery along is completely understandable.

Most of the time, the flu is something you ride out at home with rest and fluids. But unlike a common cold, it is something a doctor can treat directly in some cases — with a prescription antiviral such as oseltamivir (Tamiflu). Antivirals work best when started within the first day or two, so recognising the flu early and knowing when to see a doctor can make a real difference to your recovery.

This article covers how to recognise the flu, what actually helps to manage symptoms, and how long it usually lasts. We also cover the antiviral options available in Canada, along with the signs that mean it’s time to see a doctor.

Flu Symptoms: How to Know It Might Be the Flu

The flu, or influenza, is a contagious viral infection of the nose, throat, and lungs. Flu symptoms usually appear one to four days after exposure, and tend to come on suddenly, led by a fever, cough, and aching muscles. Chills, tiredness, headache, a sore throat, and a runny or stuffy nose are also common, and children may experience nausea, vomiting, or diarrhoea (these symptoms don’t often occur in adults).

The flu is usually different in feel from a cold. Flu tends to come on fast and affect the whole body, while a cold generally builds gradually and stays in the nose and throat, perhaps with a headache. If you’re not sure what you have, the speed and pattern of your symptoms are the most useful early clues, but seeing a doctor is the only way to know for sure.

Most healthy adults are over the worst of the flu within about a week, even if a cough lingers longer. However, for some people, the flu is far more than a rough week. Influenza remains among the ten leading causes of death in Canada, causing roughly 15,000 hospital stays and 3,500 deaths in an average year. The groups at highest risk of complications are older adults, young children, pregnant people, and those with chronic health conditions.

How Long Does the Flu Last?

How long the flu lasts varies from person to person, but it tends to follow a fairly predictable pattern. The fever and body aches are usually worst in the first two to four days, then ease, while a cough and general fatigue can linger for one to two weeks or more. So while the acute misery is often over within a few days, feeling fully back to normal can take a couple of weeks.

People often search for how to get rid of the flu in 24 hours — there’s no overnight cure, despite how often that promise turns up online. Rest, fluids, and over-the-counter medicine ease the symptoms while the illness runs its course, and starting an antiviral early can shorten it, but only modestly, and only in some cases. What helps most is giving your body the time it needs to recover.

One pattern worth watching is a flu that seems to improve and then worsens again (like a fever that returns or a cough that turns painful). That can be a sign of a complication, such as a chest or sinus infection, and it’s worth seeing a doctor rather than waiting it out.

How Long Are You Contagious With the Flu?

The period for which you’re contagious with the flu is often longer than people expect. You can spread the virus from about a day before your symptoms start until roughly five days after they begin, and you’re most contagious in those first three days. Children and people with weakened immune systems can stay infectious for longer. 

Because you can pass the flu on before you even feel most unwell, staying home and avoiding close contact for at least the first three days (and ideally until you feel better overall) does the most to protect the people around you.

How to Treat the Flu at Home

For most people, how to treat the flu comes down to easing the symptoms while your immune system does the real work. No medicine makes the virus disappear, but rest, plenty of fluids, and a few days out of your normal routine make the illness easier to get through. Warm drinks, a humidifier, and simple comfort measures can help take the edge off.

The flu is caused by a virus, and antibiotics only work against bacteria, so they do nothing for the flu itself. A doctor might prescribe antibiotics if the flu leads to a bacterial complication, such as pneumonia or a sinus infection, but not for the flu on its own.

Flu Medicine and Over-the-Counter Relief

Most flu medicine you can buy without a prescription targets the symptoms rather than the virus. Acetaminophen or ibuprofen can bring down a fever and ease aches, while decongestants and cough remedies may make you more comfortable. 

If you reach for a combination cold and flu medication, check the label first. Many products contain acetaminophen, so adding a separate acetaminophen on top can push you over the safe daily limit without realising.

Extra care is needed with flu medicine in children. The same fever and pain relievers can be used (acetaminophen at any age, ibuprofen only for babies over six months), but over-the-counter cough and cold medicines aren’t recommended under age six. Children and teenagers should also never be given ASA (Aspirin) during a flu, because of its link to a rare but serious condition called Reye syndrome.

Flu Antivirals: Oseltamivir (Tamiflu)

The prescription treatments aimed at the flu virus itself are called antivirals. The most common is oseltamivir, sold under the brand name Tamiflu. Taken as a five-day course of capsules, oseltamivir works by blocking neuraminidase, an enzyme the flu virus uses to spread from one cell to the next. Slowing the virus down gives your immune system room to get on top of the infection.

Oseltamivir is not a cure, and its benefit is modest. In otherwise healthy adults, starting it early shortens the illness by less than a day on average (around 16 hours in one major review). The evidence that it prevents more serious problems, such as pneumonia or a hospital stay, is weaker, and applies mainly to people already at higher risk of complications.

For that reason, oseltamivir isn’t prescribed for every healthy adult with the flu. It’s aimed at the people most likely to benefit (those at higher risk, and those who are severely ill), and it works best when started within about 48 hours of the first symptoms. Because that window is short, it’s worth speaking to a doctor early if you think you might need antiviral treatment.

Oseltamivir is the flu antiviral prescribed most commonly in Canada, but it isn’t the only option. Zanamivir (Relenza) is another antiviral used in Canada for flu treatment, and baloxavir (Xofluza) is a newer single-dose pill.

When to See a Doctor for the Flu

Most people get through the flu at home, but it can occasionally turn more serious. Therefore, it helps to know the signs that mean it’s time to get medical help.

It’s worth calling a doctor if:

• Your fever is very high or lasts more than three days
• You start coughing up yellow, green, or bloody mucus
• New pain settles in one place such as an ear, the chest, or the sinuses
• You seem to recover and then get worse again.

Some flu symptoms need emergency care. Call 911 if you’re having trouble breathing or feel very short of breath, or if a severe headache or stiff neck comes with confusion or trouble staying awake. 

The flu sometimes opens the door to a secondary bacterial infection, such as a sinus or ear infection, bronchitis, or pneumonia. It can also worsen an existing heart or lung condition. A doctor can check whether a secondary infection has taken hold and treat it if needed.

Who’s at Higher Risk of Flu Complications?

Some people are more likely to run into trouble with the flu. 

The highest-risk groups include:

• Adults 65 and older
• Children under five
• Pregnant people
• Anyone with a chronic condition (such as heart or lung disease, diabetes, severe obesity, kidney disease, or a weakened immune system)
• People living in long-term care

For these groups, it’s worth seeing a doctor early on — even for a flu that seems mild. This is because antivirals do the most good when started quickly.

How to Get Flu Treatment Online in Canada

The flu is well suited to an online doctor’s visit. A doctor can usually recognise it from your symptoms and history without a hands-on exam. Where it’s appropriate, they can send an antiviral or other prescription straight to your pharmacy, arranging home-delivery if required. 

Getting flu treatment from an online doctor usually works like this:

• Book a visit. Same-day appointments are often available.

• Speak with a doctor via telehealth. They’ll ask about your symptoms, how long you’ve had them, and your medical history.

• Get a prescription sent to your pharmacy. If an antiviral or other treatment is appropriate, the prescription can be sent electronically for pickup or delivery.
• Escalate if needed. If your symptoms point to something that needs in-person care, the doctor will tell you where to go and make any necessary referrals.

For BC residents, a visit with a doctor for a medical concern like the flu is covered by MSP at Walk In, so the appointment itself is free. Just click ‘Book Now’ to get started.

Can a Pharmacist Prescribe Tamiflu?

Pharmacist prescribing for minor ailments has expanded across much of Canada. However, the conditions and medication covered vary by province, and the flu and antivirals often aren’t covered. Even where pharmacists can prescribe medications for the flu, leaving home risks spreading the infection to others. Furthermore, if you have any complications, the pharmacist would need to refer you to a doctor anyway.

Seeing an online doctor or virtual walk in clinic is usually the easiest way to access flu treatment.

Getting a Sick Note for the Flu

If you need a note for work or school, an online doctor can assess you and issue a sick note in the same visit.

Frequently Asked Questions About the Flu

Can you buy Tamiflu over the counter in Canada?

Oseltamivir (Tamiflu) is prescription-only in Canada, so a doctor needs to assess you and prescribe it. An online visit is usually the fastest way to get a prescription while the treatment window is still open.

How much does Tamiflu cost in Canada?

A generic course of oseltamivir is usually around $20 to $40 out of pocket, while brand-name Tamiflu costs more. The exact price depends on your pharmacy and any drug coverage you have, so it’s worth asking your pharmacist for a current figure.

Do I still need a flu shot if I’ve already had the flu this year?

More than one strain of influenza (flu) circulates each season, and immunity from a single infection is limited. Therefore, an annual flu shot is still recommended for almost everyone six months and older.

How do I know if I have a cold or the flu?

A cold usually comes on gradually and stays fairly mild, while the flu tends to hit fast and hard, with fever, aches, and exhaustion.

Does vitamin C or zinc help with the flu?

Both vitamin C and zinc are popular over-the-counter remedies for flu, but evidence on their effectiveness is thin, and mostly about the common cold. Even for colds, regular vitamin C has at most a small effect on symptoms, and no impact on preventing you from getting sick in the first place.

Looking for Help to Manage the Flu?

For most people, the flu is a miserable but manageable week of rest, fluids, over-the-counter relief, and time. Knowing the timeline, watching for the warning signs, and staying home while you’re contagious is usually all it takes to get through it.

If you are at high risk of complications, experiencing severe symptoms, or if the flu isn’t clearing, a doctor may prescribe antivirals. These work best when started early, so it’s important to book an appointment as soon as possible. At Walk In, you can see an online doctor for flu treatment, with appointments often available the same day.

Speak to a Doctor Online About Flu