Most flu cases resolve on their own within five to seven days with rest, fluids, and over-the-counter symptom relief. Prescription antivirals can shorten that timeline, but they work best when started within 48 hours of your first symptoms. The core of flu treatment is managing your discomfort while your immune system does the heavy lifting.
Prescription Antivirals
Four antiviral medications are currently approved to treat the flu. The most commonly prescribed is oseltamivir (Tamiflu), taken as a pill or liquid twice daily for five days. A newer option, baloxavir (Xofluza), requires just a single pill, which makes it convenient if you catch it early. Two other antivirals exist: one is inhaled and the other is given by IV in a hospital setting, so they’re less common for routine cases.
Antivirals don’t cure the flu. They shorten the duration of illness, typically by about a day, and reduce the risk of complications like pneumonia. The clinical benefit is greatest the closer you start to when symptoms begin, ideally within the first 48 hours. That said, antivirals aren’t useless after that window. Studies in hospitalized patients suggest benefit even when treatment starts up to four or five days after symptom onset. And one trial in children found that starting antiviral treatment at the 72-hour mark still reduced symptoms by a full day compared to placebo.
Not everyone needs an antiviral. If you’re otherwise healthy and your symptoms are manageable, your doctor may recommend riding it out. But antivirals are strongly recommended for people at higher risk of complications, which includes adults 65 and older, children under 2, pregnant women, and anyone with chronic conditions like asthma, diabetes, heart disease, kidney disease, or a weakened immune system. People with a BMI of 40 or higher and those living in nursing homes also fall into this category. If you’re in any of these groups, call your doctor early rather than waiting to see how you feel.
Fever and Pain Relief
Acetaminophen (Tylenol) and ibuprofen (Advil, Motrin) are the two main options for bringing down a fever and easing the headaches and body aches that come with the flu. Both work well. The key safety rule with acetaminophen is to stay under 4,000 milligrams in a 24-hour period, and be aware that many combination cold-and-flu products already contain acetaminophen. Doubling up without realizing it is one of the most common medication mistakes during flu season. Always check the active ingredients on the label.
For children, avoid aspirin entirely. Its use during a viral illness in kids and teens has been linked to a rare but serious condition called Reye’s syndrome.
Over-the-Counter Symptom Relief
Multi-symptom cold and flu products bundle several active ingredients together, each targeting a different symptom. Knowing what’s in them helps you pick the right one and avoid taking ingredients you don’t need.
- Cough suppressants (like dextromethorphan) quiet a dry, unproductive cough so you can sleep.
- Expectorants (like guaifenesin) thin mucus and make a wet, productive cough more effective.
- Nasal decongestants (like phenylephrine or pseudoephedrine) aim to relieve stuffiness. Worth noting: the FDA has determined that oral phenylephrine, found in many popular products, is not effective as a decongestant. Pseudoephedrine, which you have to ask for at the pharmacy counter, works better.
- Antihistamines can help with a runny nose and sneezing, and the older types (like diphenhydramine) have the added benefit of making you drowsy enough to sleep.
If you only have a cough, buy a standalone cough product. If you only have a fever and body aches, plain acetaminophen or ibuprofen is enough. Multi-symptom products are convenient when you’re dealing with everything at once, but there’s no reason to take a decongestant if your nose is clear.
Fluids, Rest, and Home Care
Dehydration sneaks up fast during the flu. Fever increases the amount of water your body loses through sweat, and if vomiting or diarrhea is involved, the loss accelerates. The general daily recommendation is about 15 cups of fluid for men and 11 for women, but you’ll likely need more when sick. Water, broth, herbal tea, and electrolyte drinks all count. A simple way to monitor your hydration: check your urine color. Pale yellow means you’re on track. Dark yellow or amber means you need to drink more.
If nausea is making it hard to keep fluids down, take small sips rather than gulping. About one ounce (roughly two tablespoons) every three to five minutes is a pace that most people can tolerate even with an upset stomach.
Keeping your indoor humidity between 40 and 60 percent can soothe irritated airways and may help limit viral spread in your household. A simple cool-mist humidifier in your bedroom does the job. If you don’t have a humidifier, sitting in a steamy bathroom for a few minutes can temporarily ease congestion.
Rest is not optional. Your body uses enormous amounts of energy fighting a virus, and pushing through the flu to go to work or exercise tends to prolong recovery and increase the risk of complications. Sleep as much as your body asks for, especially in the first two to three days when symptoms peak.
What Recovery Looks Like
Flu symptoms typically appear one to four days after exposure and last five to seven days. Fever and the worst body aches usually break within the first three to four days. A lingering cough and fatigue, though, can hang around for a week or two after your other symptoms have cleared. This is normal and doesn’t mean you’re getting worse.
One pattern to watch for: symptoms that improve and then suddenly return or get worse. A fever that breaks for a day or two and then spikes again, or a cough that was fading but comes back stronger, can signal a secondary bacterial infection like pneumonia. That’s a reason to call your doctor.
Warning Signs That Need Immediate Care
Most people recover from the flu without incident, but certain symptoms indicate a medical emergency. In adults, seek care right away for difficulty breathing, persistent chest or abdominal pain, confusion or dizziness that won’t resolve, seizures, severe weakness, or not urinating at all. In children, watch for fast or labored breathing, bluish lips or face, ribs pulling in visibly with each breath, refusal to walk due to muscle pain, no urine output for eight hours, or a fever above 104°F that doesn’t respond to medication. For babies under 12 weeks, any fever warrants a call to your pediatrician.