Most flu cases resolve on their own within one to two weeks with rest, fluids, and over-the-counter medications to manage symptoms. Antiviral drugs can shorten the illness, but they work best when started within 48 hours of your first symptoms. The goal of treatment is to keep yourself comfortable, stay hydrated, and watch for signs that something more serious is developing.
Antiviral Medications
Four prescription antiviral drugs are currently recommended by the CDC for treating the flu. The most commonly prescribed is oseltamivir (Tamiflu), a pill or liquid taken twice a day for five days. Baloxavir (Xofluza) is a single-dose pill, which makes it the simplest option. Zanamivir (Relenza) is an inhaled powder taken twice daily for five days. Peramivir (Rapivab) is given as a one-time IV infusion in a healthcare setting.
Antivirals work best when started within 48 hours of symptom onset. After that window, the benefit drops significantly, though one clinical trial found that oseltamivir started as late as 72 hours still reduced symptoms by about one day compared to no treatment. These medications don’t cure the flu overnight. They typically shorten the illness by a day or so and can reduce the severity of symptoms.
Not everyone with the flu needs antivirals. They’re most important for people at higher risk of serious complications, including adults 65 and older, children under 2, pregnant women (up to two weeks postpartum), and people with chronic conditions like asthma, COPD, diabetes, heart disease, kidney or liver disorders, 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, contact your doctor as soon as flu symptoms start.
Managing Fever and Pain
Acetaminophen (Tylenol) and ibuprofen (Advil, Motrin) are your main tools for bringing down fever and relieving the body aches, headaches, and sore throat that come with the flu. Acetaminophen reduces fever and pain. Ibuprofen does the same but also targets inflammation. You can use either one, or alternate between them on different schedules. The key safety limit for acetaminophen is 4,000 milligrams (4 grams) in 24 hours. Going over that threshold can cause liver damage, so check all your medications for acetaminophen content, since it’s an ingredient in many combination cold and flu products.
One critical warning: never give aspirin to children or teenagers with the flu. Aspirin use during a viral infection is linked to Reye’s syndrome, a rare but serious condition that causes swelling in the liver and brain. This risk is especially high in children with certain metabolic conditions. Stick to acetaminophen or ibuprofen for anyone under 19.
Staying Hydrated
Fever, sweating, and reduced appetite all pull fluid from your body during the flu. Dehydration makes fatigue and headaches worse and can slow recovery. Water is the foundation, but you’re also losing electrolytes through sweat and fever, so plain water alone may not be enough.
Good options include electrolyte-enhanced water, broth, coconut water, and diluted fruit juice. Electrolyte powders or tablets mixed into water work well too and tend to have fewer added sugars than sports drinks. The Cleveland Clinic recommends capping electrolyte drinks at about 16 fluid ounces per day under normal circumstances, though you may need more when running a fever. Warm broth and herbal tea do double duty by hydrating you and soothing a sore throat.
Soothing a Cough and Sore Throat
Warm water or tea mixed with honey is a simple, effective cough remedy. For children ages 1 and older, half a teaspoon to one teaspoon of honey can be given straight or mixed into warm liquid. Never give honey to a baby under 12 months due to the risk of infant botulism. For adults, a spoonful of honey in warm lemon water or tea can calm an irritated throat and reduce coughing, particularly at night.
Gargling with warm salt water (about half a teaspoon of salt in a cup of warm water) can temporarily ease sore throat pain. A cool-mist humidifier in your bedroom helps keep airways moist, which makes coughing less painful and helps you sleep. Over-the-counter cough suppressants and throat lozenges can also provide short-term relief.
Rest and Recovery Timeline
Most adults feel the worst during the first three to four days of the flu. Fever, body aches, and extreme fatigue gradually ease after that, though coughing and tiredness can linger for a week or more. You’re most contagious during the first three days of illness, and some people, especially young children and those with weakened immune systems, stay contagious longer.
The general rule for returning to work or school: stay home for at least five days after symptoms began, and don’t go back until your symptoms are improving overall and you’ve been fever-free for at least 24 hours without using fever-reducing medication. That means no acetaminophen or ibuprofen masking a lingering fever. If your temperature is still elevated at the five-day mark, keep staying home.
Warning Signs That Need Immediate Attention
Most flu cases are miserable but manageable. Certain symptoms, however, signal that the illness is turning dangerous. In adults, seek emergency care for:
- Difficulty breathing or shortness of breath
- Persistent pain or pressure in the chest or abdomen
- Persistent dizziness, confusion, or difficulty staying awake
- Seizures
- Not urinating (a sign of severe dehydration)
- Severe muscle pain or weakness
- Fever or cough that improves, then returns or worsens
In children, the red flags include fast or labored breathing, ribs visibly pulling in with each breath, bluish lips or face, refusal to walk due to muscle pain, and no urine output for eight hours. A fever above 104°F that doesn’t respond to medication needs immediate evaluation. For infants younger than 12 weeks, any fever at all during flu season warrants a call to their doctor. A pattern where symptoms seem to get better and then suddenly worsen can indicate a secondary infection like pneumonia, which requires prompt treatment.