Flu treatment comes down to two categories: prescription antivirals that shorten the illness itself, and over-the-counter medications that ease your symptoms while your body fights the virus. Most people recover with OTC remedies and rest, but antivirals can cut the duration of illness and are especially important for people at higher risk of complications.
Prescription Antivirals
Four FDA-approved antiviral drugs currently treat influenza: oseltamivir (Tamiflu), zanamivir (Relenza), peramivir (Rapivab), and baloxavir (Xofluza). These work by interfering with the flu virus’s ability to replicate inside your body. They don’t kill the virus outright, but they slow it down enough to give your immune system the upper hand.
The critical detail with all of them is timing. To be effective, antivirals need to be started within 48 hours of your first symptoms. The sooner the better. If you suspect you have the flu and fall into a higher-risk group, contact your doctor right away rather than waiting to see if symptoms improve on their own.
Oseltamivir is the most commonly prescribed option. It’s a pill taken twice a day for five days. The most common side effect is nausea, which affects roughly 10% of people taking it (compared to about 6% on placebo). Taking it with food helps. Rare reports of neuropsychiatric effects like confusion or delirium have surfaced, mostly in Japanese adolescents, though multiple analyses have found no clear increased risk.
Baloxavir (Xofluza) is the newest option and has one significant advantage: it’s a single dose. You take one pill and you’re done. It’s approved for people five years and older. The dose is weight-based, with most adults taking a single 40 mg or 80 mg tablet depending on whether they weigh above or below 80 kg (about 176 pounds).
Who Should Get Antivirals
The CDC recommends antiviral treatment for anyone with the flu who is hospitalized, has severe or worsening symptoms, or is at higher risk of complications. Higher-risk groups include adults 65 and older, children under 5 (especially under 2), pregnant women, and people with chronic conditions like asthma, diabetes, heart disease, or weakened immune systems.
If you’re otherwise healthy and your symptoms are manageable, your doctor may still offer antivirals, but they’re less urgent. For high-risk individuals, treatment should start before lab confirmation even comes back. Waiting for a test result can waste the narrow window when antivirals work best.
Over-the-Counter Fever and Pain Relief
Acetaminophen (Tylenol) and ibuprofen (Advil, Motrin) are the go-to options for reducing fever and relieving the body aches, headaches, and sore throat that come with the flu. Both work well. Acetaminophen is gentler on the stomach, while ibuprofen also reduces inflammation, which can help with swollen sinuses and muscle pain.
The key safety limit to remember with acetaminophen is 4,000 mg in 24 hours. That ceiling is easy to hit accidentally because acetaminophen is an ingredient in many combination cold and flu products. If you’re taking a multi-symptom formula like NyQuil or DayQuil, check the label before adding standalone acetaminophen on top.
One important rule for children and teenagers: never give aspirin during the flu. Aspirin use during viral infections in young people is linked to Reye’s syndrome, a rare but serious condition that causes dangerous swelling in the liver and brain. Most children with Reye’s syndrome survive, but lasting brain damage is possible, and without treatment it can be fatal within days. Stick with acetaminophen or ibuprofen for anyone under 19.
Cough and Congestion Medications
For a dry, hacking cough that keeps you up at night, look for products containing dextromethorphan (often labeled “DM” on the box). It’s a cough suppressant that quiets the cough reflex. If your cough is producing thick mucus and your chest feels heavy, guaifenesin is a better choice. It’s an expectorant that thins mucus so you can clear it more easily. Many combination products include both.
These medications are meant for short-term, as-needed use. They manage symptoms but don’t speed up recovery. If a cough persists beyond two weeks or gets significantly worse after initially improving, that’s worth a call to your doctor.
For nasal congestion, decongestant sprays or pills containing pseudoephedrine or phenylephrine can open up your airways. Saline nasal sprays or rinses are a drug-free alternative that loosens mucus and moisturizes irritated nasal passages. Sore throats respond well to lozenges, warm liquids, or a simple saltwater gargle.
Hydration and Rest
No medication replaces the basics. Fever, sweating, and reduced appetite during the flu make dehydration a real concern. General guidelines suggest at least 9 cups of fluid per day for women and 12 cups for men, and you likely need more when you’re sick. Water, broth, herbal tea, and electrolyte drinks all count. A quick way to gauge your hydration: check the color of your urine. Pale yellow means you’re on track. Dark yellow to amber means you need more fluids.
Rest is genuinely productive, not passive. Sleep is when your immune system does its most aggressive work against the virus. Trying to push through the flu typically extends it.
Warning Signs That Need Immediate Attention
Most flu cases resolve within one to two weeks, but certain symptoms signal something more dangerous. In adults, seek emergency care for difficulty breathing, chest or abdominal pain, sudden dizziness, confusion, or severe persistent vomiting. One pattern to watch closely: flu symptoms that seem to improve and then return with a higher fever and worse cough. That can indicate a secondary infection like pneumonia.
In children, fast or labored breathing, bluish skin, refusal to drink fluids, unusual irritability, and unresponsiveness all warrant immediate medical attention. For infants, trouble breathing, inability to eat, and crying without tears are emergency signs.