For most people with the flu, a combination of over-the-counter pain relievers, fever reducers, and symptom-specific medications will manage the worst of it while your body fights off the virus. Prescription antivirals can shorten the illness, but they work best when started within 48 hours of your first symptoms. What you take depends on which symptoms are hitting you hardest.
Fever and Body Aches
Acetaminophen (Tylenol) and ibuprofen (Advil, Motrin) are the two go-to options for bringing down a fever and easing the muscle aches that make the flu feel so miserable. Both work well; ibuprofen also reduces inflammation, which can help with sore throat and sinus pressure on top of the pain relief. The daily maximum for adults is 3,000 mg for acetaminophen and 2,400 mg for ibuprofen.
One critical safety rule: never give aspirin to children or teenagers with the flu. Aspirin combined with a viral illness can trigger Reye’s syndrome, a rare but serious condition where the liver swells, blood sugar drops, and the brain can begin to swell. Acetaminophen or ibuprofen are safe alternatives for kids.
Cough and Congestion
If a dry, hacking cough is keeping you up at night, a cough suppressant containing dextromethorphan (often labeled “DM” on the box) can help quiet it. This works by reducing the urge to cough. It’s appropriate for adults and children over 12, but should not be given to younger children.
If your cough feels wet and productive, an expectorant like guaifenesin (Mucinex) takes the opposite approach. Instead of suppressing the cough, it thins the mucus in your airways so you can clear it out more easily. For nasal congestion, a decongestant containing pseudoephedrine or phenylephrine can open up your sinuses, though these can raise blood pressure and shouldn’t be used long-term.
Watch for Ingredient Overlap
Multi-symptom flu products (NyQuil, DayQuil, Theraflu, and similar brands) bundle several active ingredients into one dose. That’s convenient, but it creates a real risk: many of these products contain acetaminophen, and if you’re also taking standalone Tylenol, you can accidentally exceed the safe daily limit. Too much acetaminophen causes liver damage, and it’s one of the most common causes of accidental overdose.
Before combining any over-the-counter products, flip the box over and read the active ingredients list. If two products both contain acetaminophen, pick one or the other. The same goes for any shared ingredient, whether it’s a decongestant, cough suppressant, or antihistamine.
Prescription Antivirals
Prescription antiviral medications can shorten your flu by roughly a day and reduce the severity of symptoms. The key limitation is timing. These drugs work best when started within 48 hours of your first symptoms. After that window, the benefit drops significantly, though one study found that starting treatment even at 72 hours still reduced symptoms by about a day in children.
Two antivirals are commonly prescribed. Oseltamivir (Tamiflu) is taken twice daily for five days. Baloxavir (Xofluza) requires just a single dose, which is more convenient. For influenza B specifically, baloxavir reduced the time to symptom improvement by more than 24 hours compared to oseltamivir.
The CDC recommends that people at higher risk of serious flu complications start antivirals as soon as possible if flu is suspected. This includes adults 65 and older, children under 5, pregnant women, and anyone with chronic conditions like asthma, diabetes, or heart disease. Your doctor does not need to run a test before prescribing; a clinical diagnosis based on your symptoms is enough. If you test positive on a home flu test and fall into a higher-risk group, call your doctor that same day to ask about antivirals.
Fluids and Rest
Fever, sweating, and sometimes vomiting or diarrhea pull fluid out of your body faster than usual. Replacing that fluid matters more than most people realize. A healthy adult typically needs around 11.5 to 15.5 cups of total fluid per day under normal conditions, and illness pushes that need higher. Water is fine, but broth and electrolyte drinks help replace the minerals you’re losing.
You can gauge your hydration by checking your urine color. Pale yellow or clear means you’re on track. Dark yellow, a dry mouth, headaches, or dizziness are signs you need to drink more. In children, watch for no urine output over eight hours, no tears when crying, or a dry mouth, all of which signal dehydration that may need medical attention.
Supplements: What the Evidence Shows
Zinc, vitamin C, and elderberry are the most commonly reached-for supplements during flu season. The evidence is modest but real for the first two. Zinc appears to shorten the duration of respiratory illness symptoms by a few days, though it doesn’t prevent infection in the first place. Vitamin C, taken daily at around 200 mg, may help you feel better about 13 hours sooner during a typical seven-day illness. That’s not dramatic, but it’s measurable.
Most of this research was conducted on colds rather than influenza specifically, so the results don’t translate perfectly. Supplements won’t replace medications or antivirals, but they’re unlikely to cause harm at standard doses and may offer a small edge.
Emergency Warning Signs
Most flu cases resolve on their own within a week or two, but certain symptoms signal complications that need immediate medical care.
In adults, get emergency help for:
- Difficulty breathing or shortness of breath
- Persistent pain or pressure in the chest or abdomen
- Confusion, dizziness, or inability to stay alert
- Not urinating
- Severe weakness or unsteadiness
- Seizures
- A fever or cough that improves, then comes back worse
In children, the list includes all of the above plus: ribs visibly pulling in with each breath, bluish lips or face, refusal to walk due to severe muscle pain, no urine for eight hours, and any fever in an infant under 12 weeks old. A fever above 104°F that doesn’t respond to fever-reducing medication also warrants emergency care.
The pattern to watch for in any age group is a flu that seems to be getting better, then suddenly gets worse. That often signals a secondary infection like pneumonia and needs prompt treatment.