If you’ve been diagnosed with influenza A, the most important thing you can do is rest, stay hydrated, and contact your doctor about antiviral medication as early as possible, ideally within 48 hours of your first symptoms. Most healthy adults recover within one to two weeks, but the first few days are typically the worst. Here’s how to manage it effectively.
Get Antiviral Medication Early
Prescription antiviral drugs are the single most effective treatment for influenza A. They work by blocking the virus’s ability to copy itself inside your cells, which shortens the duration of fever and other symptoms. Clinical trials consistently show the greatest benefit when treatment starts within 36 to 48 hours of symptom onset.
That 48-hour window matters, but it’s not a hard cutoff. One trial in children found that starting antiviral treatment even 72 hours after symptoms began still reduced illness by about a day compared to no treatment. For people sick enough to be hospitalized, studies suggest antivirals can lower the risk of death even when started four or five days into the illness. So if you’re past the two-day mark, it’s still worth calling your doctor, especially if your symptoms are severe or you’re in a high-risk group.
To get a prescription, call your doctor’s office or use a telehealth visit. Many providers can diagnose flu based on your symptoms during peak season and call in a prescription without requiring an in-person visit. The sooner you start, the better you’ll feel.
Managing Fever and Body Aches at Home
Influenza A typically brings a high fever (often 100°F to 104°F), intense body aches, headache, and fatigue. Over-the-counter fever reducers are your main tool for comfort. Acetaminophen (Tylenol) can be taken every four to six hours, up to five doses per day. Ibuprofen (Advil, Motrin) can be taken every six to eight hours, up to four doses per day. Check the label on your specific product for the maximum daily amount.
If one medication alone isn’t bringing your fever down or relieving aches, you can safely use both together or alternate them. Just make sure you’re not giving acetaminophen more often than every four hours or ibuprofen more often than every six hours. Keeping a written log of what you took and when helps prevent accidental double-dosing, especially when you’re foggy from being sick.
One critical safety rule: never give aspirin to children or teenagers with the flu. Aspirin during a viral illness is linked to Reye’s syndrome, a rare but serious condition that causes swelling in the liver and brain. Symptoms typically appear three to five days after the infection begins and can include persistent vomiting, confusion, and seizures. Stick with acetaminophen or ibuprofen for anyone under 19.
Staying Hydrated
Fever, sweating, and reduced appetite can drain your fluids quickly. Start pushing extra liquids at the first sign of illness. Water, broth, and sports drinks are all good options. Avoid alcohol, coffee, tea, and caffeinated sodas, which can contribute to fluid loss.
If you’re too weak to drink from a cup, try a straw or squeeze bottle, or suck on ice chips and frozen pops. For babies, continue breastfeeding or formula feeding as normal. If a baby refuses to nurse or take a bottle, that’s a reason to call your pediatrician, who may recommend an oral rehydration solution like Pedialyte. Older adults and people with kidney problems should check with their doctor about how much fluid is safe to drink.
How Long You’re Contagious
You’re most contagious during the first three days of illness, but you can potentially spread the virus starting one day before symptoms appear and for five to seven days after getting sick. Young children and people with weakened immune systems may be contagious even longer. Stay home until at least 24 hours after your fever breaks without the help of fever-reducing medication. This protects the people around you during the period when you’re shedding the most virus.
Who Needs to Be Extra Careful
Certain groups face a higher risk of serious complications like pneumonia, hospitalization, or worse. If you fall into any of these categories, contact your doctor at the first sign of flu symptoms rather than waiting to see how things develop:
- Age: Adults 65 and older, children under 5 (with the highest risk in children under 2 and especially infants under 6 months)
- Lung conditions: Asthma, COPD, cystic fibrosis
- Heart conditions: Congenital heart disease, heart failure, coronary artery disease
- Metabolic conditions: Diabetes, inherited metabolic disorders
- Other chronic conditions: Kidney disease, liver disease, blood disorders like sickle cell disease, neurological conditions, history of stroke
- Immune suppression: HIV/AIDS, cancer treatment, long-term use of corticosteroids or other immune-suppressing drugs
- Pregnancy: Including up to two weeks after delivery
- Obesity: A BMI of 40 or higher
- Disability-related risks: Conditions affecting muscle function, lung capacity, or the ability to cough and clear the airway
People in these groups benefit most from early antiviral treatment, even if their symptoms seem mild at first. The virus can escalate quickly when the body’s defenses are already compromised.
Warning Signs That Need Emergency Care
Most flu cases resolve on their own, but certain symptoms signal that something more dangerous is happening. In adults, get emergency help for difficulty breathing or shortness of breath, persistent chest or abdominal pain or pressure, confusion, dizziness that won’t go away, inability to arouse someone, seizures, not urinating, severe muscle pain, or severe weakness. Also watch for a fever or cough that seems to improve and then comes back worse, which can indicate a secondary infection like pneumonia.
In children, the warning signs include fast or labored breathing, ribs pulling in visibly with each breath, bluish lips or face, refusal to walk due to muscle pain, signs of dehydration (no urine for 8 hours, dry mouth, no tears), not being alert or interactive when awake, seizures, or a fever above 104°F that doesn’t respond to medication. Any fever in an infant younger than 12 weeks is a reason to seek immediate medical attention.
Rest and Recovery Timeline
Most healthy adults feel the worst during days two through four, with fever, chills, and severe fatigue peaking in that window. Fever typically breaks within five days. Cough and tiredness often linger for one to two weeks after other symptoms have cleared, which is normal and doesn’t necessarily mean something is wrong.
During recovery, genuine rest matters. Your immune system is burning enormous energy fighting the virus, and pushing through with normal activities tends to prolong the illness. Sleep as much as your body wants. Eat what you can tolerate, even if it’s small amounts. The combination of rest, fluids, fever management, and early antiviral treatment gives your body the best chance at a faster, smoother recovery.