Influenza A is treated with a combination of antiviral medication, over-the-counter symptom relief, and rest. The single most important factor in treatment is timing: antiviral drugs work best when started within two days of your first symptoms. Most people recover in five to seven days, though fatigue can linger beyond that.
Antiviral Medications
Four FDA-approved antiviral drugs are currently recommended for treating influenza. The most commonly prescribed is oseltamivir (Tamiflu), a pill or liquid taken twice a day for five days. Baloxavir (Xofluza) is a newer option that requires only a single oral dose, making it convenient if you want the simplest regimen. Zanamivir (Relenza) is an inhaled powder taken twice daily for five days, and peramivir (Rapivab) is given as a one-time IV infusion by a healthcare provider, typically reserved for people who can’t take medication by mouth.
These drugs don’t cure the flu instantly. They shorten the duration of illness and reduce the severity of symptoms, and they significantly lower the risk of serious complications like pneumonia. For otherwise healthy adults, antivirals are most beneficial when started within 48 hours of symptom onset. For people at higher risk of complications, treatment should begin as soon as possible, even before a flu test confirms the diagnosis.
Who Needs Antivirals Most
Antivirals are strongly recommended, not just optional, for certain groups. These include adults 65 and older, children younger than 2, pregnant women (including up to two weeks postpartum), and people living in nursing homes or long-term care facilities.
A wide range of chronic conditions also puts you in the high-priority category:
- Lung conditions like asthma, COPD, or cystic fibrosis
- Heart disease including congestive heart failure or coronary artery disease
- Diabetes and other endocrine disorders
- Kidney or liver disorders
- Weakened immune systems from conditions like HIV, cancer treatment, or long-term use of immune-suppressing medications
- Neurologic conditions that affect muscle function, swallowing, or the ability to clear airways
- BMI of 40 or higher
- Blood disorders like sickle cell disease
- History of stroke
If you fall into any of these categories, call your doctor at the first sign of flu symptoms. Don’t wait for a positive test result. Early treatment matters more than a confirmed diagnosis.
Managing Symptoms at Home
Whether or not you take an antiviral, home care makes a real difference in how you feel during recovery. Fever, body aches, and headaches respond well to acetaminophen (Tylenol) or ibuprofen (Advil, Motrin). If using acetaminophen, stay below 3,250 mg per day from all sources combined, including combination cold and flu products. Exceeding 4,000 mg in 24 hours risks serious liver damage.
One critical rule for children and teenagers: never give aspirin or any aspirin-containing product during a flu illness. Aspirin use during viral infections is linked to Reye’s syndrome, a rare but potentially fatal condition that causes dangerous swelling in the brain and liver. Most children who develop Reye’s syndrome survive, but lasting brain damage is possible.
Hydration and Rest
Fever, sweating, vomiting, and diarrhea all drain fluids from your body faster than usual. Dehydration can worsen headaches, cause dizziness, and slow recovery. Aim to drink enough that your urine stays light yellow or colorless. Water is fine, but broth and oral rehydration solutions are especially useful if you’re vomiting or have diarrhea, since they help replace lost minerals.
Watch for signs you’re falling behind: dark urine, dry mouth, confusion, or dizziness. In children, dehydration shows up as no urine output for eight hours, no tears when crying, or a dry mouth. These signs warrant a call to your doctor or a visit to urgent care.
Rest genuinely accelerates recovery. Your immune system works hardest while you sleep, and pushing through normal activities while feverish tends to extend the illness rather than shorten it.
What Recovery Looks Like
Flu symptoms typically appear one to four days after exposure. The worst of it, including high fever, intense body aches, chills, and sore throat, generally lasts five to seven days. Most people turn a corner around day four or five, when the fever breaks and energy starts returning. Cough and fatigue often hang on longer, sometimes for a week or two after other symptoms have cleared. This lingering tiredness is normal and doesn’t mean something is wrong.
If you start feeling better and then get worse again, that’s a different situation. A fever or cough that improves and then returns can signal a secondary infection like bacterial pneumonia, which needs prompt medical attention.
Emergency Warning Signs
Most flu cases resolve on their own or with antiviral treatment. But certain symptoms signal that something more serious is happening and require immediate emergency care.
In adults, get help right away for:
- Difficulty breathing or shortness of breath
- Persistent chest or abdominal pain or pressure
- Confusion, persistent dizziness, or difficulty staying conscious
- Seizures
- Not urinating
- Severe weakness or unsteadiness
In children, the warning signs include:
- Fast breathing, trouble breathing, or ribs pulling in with each breath
- Bluish lips or face
- Severe muscle pain where the child refuses to walk
- Not being alert or responsive when awake
- Seizures
- Fever above 104°F that doesn’t respond to fever-reducing medication
- Any fever in an infant younger than 12 weeks
In both adults and children, worsening of any existing chronic condition during the flu is also a reason to seek emergency care.