Flu treatment combines rest, fluids, and over-the-counter symptom relief for most people, with prescription antiviral medications reserved for those at higher risk of complications or those who catch treatment early enough. Most healthy adults recover within one to two weeks without medical intervention, but starting an antiviral within 48 hours of symptom onset can shorten the illness and reduce the chance of serious complications like pneumonia.
Antiviral Medications
Four prescription antiviral drugs are currently approved to treat influenza. The most widely used is oseltamivir (Tamiflu), taken as a pill twice daily for five days. A newer option, baloxavir (Xofluza), requires only a single dose, making it the simplest treatment course available. Two other antivirals, zanamivir (Relenza) and peramivir (Rapivab), are used less frequently. Zanamivir is inhaled, and peramivir is given as an IV infusion.
These medications work best when started as soon as possible after symptoms appear, ideally within 48 hours. At that point, they can shorten fever and other symptoms and lower the risk of complications like ear infections in children or pneumonia in adults. There’s some evidence that treatment started even at 72 hours can still trim about a day off recovery time, so it’s not necessarily too late if you’re past the 48-hour window. For influenza B specifically, baloxavir has been shown to improve symptoms more than 24 hours faster than oseltamivir.
Not everyone with the flu needs antivirals. Your doctor is most likely to prescribe them if you fall into a higher-risk category or if your symptoms are severe.
Who Needs Antiviral Treatment Most
The CDC recommends prompt antiviral treatment for anyone at increased risk of flu complications, even if symptoms seem mild at first. The list of higher-risk groups is longer than many people realize:
- Age: Adults 65 and older, and children younger than 2
- Pregnancy: Including up to two weeks after delivery
- Chronic conditions: Asthma, COPD, heart disease, diabetes, kidney or liver disorders, sickle cell disease, and neurological conditions
- Weakened immune systems: From HIV, cancer, chemotherapy, long-term steroid use, or other immunosuppressive treatments
- Obesity: A BMI of 40 or higher
- Nursing home residents and people with disabilities affecting breathing or airway clearance
If you’re in any of these groups, contact your doctor at the first sign of flu symptoms rather than waiting to see if you improve on your own. Early treatment makes the biggest difference for people whose bodies are less equipped to fight the virus.
Managing Symptoms at Home
Whether or not you take an antiviral, symptom management is a core part of flu treatment. For fever, headaches, and body aches, acetaminophen (Tylenol) or ibuprofen (Advil, Motrin) are your best options. Aspirin should be avoided in anyone under 19, as it’s linked to Reye syndrome, a rare but serious complication of viral infections.
For cough, the right medication depends on what kind of cough you have. A dry, hacking cough responds to a cough suppressant, while a productive cough with mucus is better treated with an expectorant, which helps thin and loosen phlegm so you can clear it more easily. Many combination cold-and-flu products contain both, so check the active ingredients to make sure you’re treating your actual symptoms and not doubling up on anything.
Hydration matters more than most people think during the flu. Fever increases fluid loss, and many people eat and drink less when they feel miserable. Water and clear liquids are the standard recommendation. If you have heart, kidney, or liver disease, check with your doctor before significantly increasing your fluid intake.
How Long the Flu Lasts
Fever and the worst symptoms typically peak in the first few days, then gradually improve. You’re most contagious during the first three days of illness, though you can spread the virus starting a full day before symptoms appear and for five to seven days after getting sick. Children and people with weakened immune systems may remain contagious even longer.
Fatigue and a lingering cough can hang on well after fever breaks. Many people feel wiped out for a week or more after other symptoms resolve. This is normal and not a sign of a secondary infection on its own. Returning to work or school too quickly can slow your recovery and spread the virus to others. The general guideline is to stay home until you’ve been fever-free for at least 24 hours without using fever-reducing medication.
Warning Signs That Need Immediate Care
Most flu cases resolve on their own, but certain symptoms signal that the illness has become dangerous. In adults, seek emergency care for difficulty breathing, persistent chest or abdominal pain, confusion or dizziness that won’t go away, seizures, not urinating, or severe weakness. A fever or cough that improves and then suddenly returns or worsens is also a red flag, as it can indicate a secondary bacterial infection like pneumonia.
In children, watch for fast or labored breathing, bluish lips or face, ribs pulling in visibly with each breath, severe muscle pain (a child who refuses to walk), and signs of dehydration like no urine for eight hours, a dry mouth, or no tears when crying. Any fever in an infant younger than 12 weeks warrants immediate medical attention, regardless of how mild it seems. A fever above 104°F in an older child that doesn’t respond to fever-reducing medication also calls for urgent evaluation.