Flu treatment involves two categories of medicine: prescription antivirals that fight the virus itself, and over-the-counter products that manage symptoms like fever, body aches, cough, and congestion. Most people recover with OTC symptom relief and rest alone, but antivirals can shorten the illness when started within 48 hours of the first symptoms.
Prescription Antivirals
Antiviral medications are the only drugs that actually target the influenza virus rather than just masking symptoms. They work best when started as close to symptom onset as possible, ideally within 48 hours. After that window, they still offer some benefit for people at high risk of complications, but the effect drops off significantly.
The most commonly prescribed antiviral is oseltamivir (Tamiflu), taken as a pill twice daily for five days. It’s approved for adults and children as young as two weeks old. A newer option, baloxavir (Xofluza), requires only a single dose, which makes it appealing if you don’t want to manage a five-day course. Xofluza is approved for people 12 and older, and the dose depends on your weight. There’s also zanamivir (Relenza), an inhaled antiviral, though it’s used less often.
You can’t pick these up at the pharmacy on your own. All require a prescription, so you’ll need to contact a doctor or urgent care clinic early in your illness if you want antiviral treatment. Doctors are most likely to prescribe them for people at higher risk of serious flu complications: adults 65 and older, young children, pregnant women, and anyone with chronic conditions like asthma, diabetes, or heart disease.
Fever and Body Aches
Acetaminophen (Tylenol) and ibuprofen (Advil, Motrin) are the go-to choices for the fever, headache, and muscle pain that come with the flu. Both lower fever and relieve pain, though ibuprofen also reduces inflammation. You can alternate the two if one alone isn’t controlling your fever, but be careful not to exceed the recommended dose on each label.
One important restriction: do not give aspirin to children or teenagers with the flu. Aspirin use during viral illnesses like influenza has been linked to Reye’s syndrome, a rare but serious condition that causes swelling in the liver and brain. Symptoms of Reye’s syndrome include persistent vomiting, confusion, seizures, and loss of consciousness. Stick with acetaminophen or ibuprofen for anyone under 19.
Cough Medicine
The right cough medicine depends on what kind of cough you have. A dry, hacking cough calls for a suppressant containing dextromethorphan (the “DM” you see on many labels). It quiets the cough reflex so you can sleep and function. If your cough is wet and producing mucus, an expectorant like guaifenesin (Mucinex) is the better choice. It thins the mucus so you can cough it up more easily. It won’t stop the coughing, but it makes each cough more productive, which helps clear your airways faster.
Don’t use an expectorant for a dry cough. And if you’re not sure which type you have, start by paying attention: if nothing comes up when you cough, it’s dry. If you can feel mucus moving, it’s wet.
Congestion and Sore Throat
Nasal decongestants containing pseudoephedrine or phenylephrine can help relieve the stuffed-up feeling. Pseudoephedrine (Sudafed) is kept behind the pharmacy counter but doesn’t require a prescription. Nasal saline sprays or rinses are a drug-free alternative that loosens mucus and moisturizes irritated nasal passages.
For a sore throat, lozenges, warm liquids, and acetaminophen or ibuprofen typically provide enough relief. Throat sprays with a mild numbing agent can also help if swallowing is painful.
Watch Out for Combination Products
Many flu medicines (NyQuil, DayQuil, Theraflu) bundle several active ingredients into one dose. That’s convenient, but it creates a real risk of doubling up. If you take a combination product that already contains acetaminophen and then pop extra Tylenol for your headache, you could exceed a safe dose without realizing it. Always read the active ingredient list on every product you’re taking, and avoid stacking medications that share the same ingredients.
Fluids and Rest
No pill replaces the basics. Fever, sweating, and reduced appetite during the flu can quickly lead to dehydration, which throws off your body’s electrolyte balance. That imbalance shows up as thirst, muscle cramps, brain fog, and fatigue on top of what the flu is already doing to you. Water is fine for mild cases, but if you’ve had a fever for a couple of days or can’t keep food down, an electrolyte drink can help replenish sodium, potassium, and other minerals you’re losing. Keep electrolyte drinks to about 16 ounces a day, though. Overdoing sodium or potassium brings its own problems.
Rest is equally non-negotiable. Your immune system does its heaviest work while you sleep, and pushing through the flu typically extends it.
Warning Signs That Need Immediate Care
Most flu cases resolve in one to two weeks, but certain symptoms signal that something more dangerous is happening. In adults, seek emergency care for difficulty breathing, persistent chest or abdominal pain, confusion, dizziness that won’t go away, seizures, severe weakness, or not urinating. A fever or cough that improves and then suddenly gets worse again is also a red flag, since it can indicate a secondary infection like pneumonia.
In children, watch for fast or labored breathing, bluish lips or face, ribs visibly pulling in with each breath, refusal to walk due to muscle pain, or no urine output for eight hours. Any fever in a baby younger than 12 weeks warrants immediate medical attention regardless of how mild it seems.