Yes, there are prescription antiviral medications specifically designed to treat the flu, and they work best when started within 48 hours of your first symptoms. There are also over-the-counter options that won’t fight the virus itself but can make you feel significantly better while your body does the work. Here’s what’s available and how to decide what you need.
Prescription Antivirals: The Only Drugs That Fight the Virus
Four FDA-approved antiviral drugs treat influenza in the United States. These are the only medications that actually target the flu virus rather than just masking symptoms. They work by interfering with the virus’s ability to copy itself and spread to new cells in your body. When the virus infects a cell, it eventually needs to break free and move on to infect neighboring cells. Antivirals block that process, trapping the virus and slowing the infection down enough for your immune system to catch up.
The most well-known is oseltamivir (Tamiflu), which comes as a pill or liquid and is approved for anyone 14 days old and older. Baloxavir (Xofluza) is a newer option that requires only a single dose, which is a clear advantage over oseltamivir’s twice-daily, five-day course. A third option, zanamivir (Relenza), is inhaled through a special device and is approved for ages 7 and up, though it’s not recommended for people with asthma or other lung conditions. The fourth, peramivir (Rapivab), is given by IV and is typically reserved for people who can’t take medication by mouth.
All of these require a prescription. You can’t pick them up off the shelf, so you’ll need to see a doctor or use a telehealth visit to get one.
How Well Do Antivirals Work?
Antivirals shorten the duration of fever and other symptoms and can reduce the risk of complications like pneumonia, ear infections in children, and respiratory failure. The benefit is greatest when you start treatment within 48 hours of feeling sick. Starting later still helps, but less dramatically. One clinical trial found that children who began treatment at the 72-hour mark still recovered about a day sooner than those who took a placebo.
If you’re choosing between oseltamivir and baloxavir, clinical trials in children show they perform similarly in terms of how quickly symptoms improve and how long fever lasts. Baloxavir does clear the virus from the body faster, reducing viral levels significantly more at the 48-hour mark. For influenza B specifically, baloxavir shortened symptoms by more than 24 hours compared to oseltamivir. Baloxavir also had a slightly lower rate of side effects overall (about 25% of patients versus 28% for oseltamivir).
The most common side effect of oseltamivir is nausea and vomiting. Roughly 10% of adults experience nausea and 9% experience vomiting, compared to about 6% and 3% on placebo. In children, 14% experienced vomiting versus 8.5% on placebo. Zanamivir’s side effects (diarrhea, nausea, headache, dizziness) each occurred in fewer than 5% of patients in clinical trials, similar to placebo rates.
Who Should Get Antivirals Quickly
For otherwise healthy adults, the flu is miserable but usually not dangerous, and antivirals are optional. But for certain groups, prompt antiviral treatment is strongly recommended because the flu carries a real risk of serious complications:
- Adults 65 and older
- Children younger than 2 (with infants under 6 months at the highest risk of hospitalization and death)
- Pregnant women, including up to two weeks postpartum
- People with asthma, COPD, heart disease, diabetes, kidney or liver disease, sickle cell disease, or a weakened immune system
- People with a BMI of 40 or higher
- People who have had a stroke or have conditions affecting muscle function, breathing, or the ability to cough and clear their airways
- Residents of nursing homes or long-term care facilities
If you fall into any of these categories, don’t wait to see if symptoms get worse. Contact your doctor as soon as you suspect the flu.
Over-the-Counter Options for Symptom Relief
OTC medications won’t shorten your illness, but they can take the edge off while you recover. For fever, headache, body aches, and sore throat, acetaminophen (Tylenol) or ibuprofen (Advil, Motrin) are the go-to choices. Both reduce fever and relieve pain effectively.
For a stuffy nose, oral decongestants containing pseudoephedrine or nasal sprays containing oxymetazoline can shrink swollen tissue in your nasal passages and help you breathe. Nasal sprays work quickly but shouldn’t be used for more than three days in a row, as they can cause rebound congestion. Multi-symptom flu products combine several of these ingredients into one pill, but check the labels carefully to avoid doubling up on acetaminophen if you’re already taking it separately.
Do Natural Remedies Help?
The short answer: there is no strong scientific evidence that any natural product is useful against the flu specifically. Zinc taken by mouth within 24 hours of cold symptoms can shorten the duration of a cold, but colds and flu are different viruses. Vitamin C taken regularly provides only a slight reduction in cold severity and duration, and taking it after you’re already sick doesn’t help at all. Echinacea has not been proven to prevent or treat colds, with mixed and limited results across studies. Probiotics show weak evidence for preventing upper respiratory infections, but not enough to recommend them confidently.
What does help, without any ambiguity, is rest and hydration. The flu causes significant fluid loss through fever and sweating, and staying hydrated keeps mucus thinner and easier to clear. None of this replaces antivirals for high-risk individuals, but for most healthy people riding out a mild to moderate case, fluids, sleep, and OTC symptom relief are the practical core of treatment.