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Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Repair Windows errors before they cause bigger problemsFix Now →Scan for outdated or missing drivers - takes under a minuteDriver Scan →Antibiotics treat certain bacterial infections; antivirals treat particular viruses. Neither is a substitute for the other, and not every infection has a medicine that treats it. The right choice depends on the diagnosis. For flu and COVID-19, treatment may also be time-sensitive, so contact a healthcare professional promptly if you may qualify.
What is the difference between antibiotics and antivirals?
| Medicine | What it treats | Key point |
|---|---|---|
| Antibiotics | Certain infections caused by bacteria | They do not work against viruses. The CDC lists strep throat, whooping cough and urinary tract infections as examples of bacterial illnesses antibiotics can treat. |
| Antivirals | A particular virus, or a limited set of viruses depending on the medicine | They are not interchangeable with one another: a flu antiviral is intended for influenza, while COVID-19 treatments are separate options for COVID-19. |
The drugs act on different kinds of infectious agents. An antibiotic cannot replace an antiviral, and an antiviral cannot treat a bacterial infection. As the CDC explains in its flu antiviral guidance, “Antiviral drugs are different from antibiotics, which fight against bacterial infections.”
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Which illnesses may need which treatment?
Bacterial infections
Antibiotics may be prescribed for bacterial illnesses such as strep throat, whooping cough or a urinary tract infection. Whether antibiotics are appropriate for an individual case requires evaluation and diagnosis; symptoms alone do not establish that an infection is bacterial.
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Influenza and COVID-19 are respiratory viral illnesses for which specific antiviral treatment options exist. That does not mean every viral illness has an antiviral medicine: the CDC says there are no antivirals that work against the other respiratory viruses that cause common-cold symptoms. For a cold, antibiotics will not treat the virus or make a person feel better, as the CDC’s cold guidance states.
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A bacterial complication during a viral illness
A viral infection can sometimes be followed by a bacterial infection, such as pneumonia. A clinician may prescribe antibiotics for that diagnosed bacterial complication—not to treat the virus itself. Feeling very ill with a viral respiratory infection, by itself, is not a reason to take antibiotics.
Why timing matters for flu and COVID-19 antivirals
Antiviral treatment is specific to the virus and may be most useful when started within a defined window. The following treatment details reflect US CDC guidance available in 2026; eligibility, labels and recommendations can change, and other countries may use different guidance. These are not instructions to select or start a prescription on your own.
Influenza
CDC guidance says flu antivirals work best when started within one to two days after symptoms begin. Prompt treatment is recommended for people at increased risk of serious flu complications; treatment started later can still help some higher-risk people and people who are hospitalized. The CDC’s June 26, 2026 guidance for the 2026–27 flu season lists oseltamivir, zanamivir, peramivir and baloxavir. Flu antivirals are prescription medicines, not over-the-counter products. See the CDC flu antiviral guidance for current details.
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COVID-19
The CDC outpatient treatment page dated February 5, 2026 describes options for eligible patients at higher risk of severe COVID-19. It lists oral nirmatrelvir-ritonavir for eligible patients aged 12 years or older who weigh at least 40 kg, started within five days of symptom onset; intravenous remdesivir for eligible adults and children aged 28 days or older who weigh at least 3 kg, started within seven days; and molnupiravir for adults when preferred treatments are unavailable or inappropriate, started within five days. The page also flags drug interactions and other clinical considerations; molnupiravir has pregnancy precautions. A clinician must assess eligibility and suitability.
For context, the CDC page reports that a three-day course of remdesivir reduced the risk of hospitalization and death by 87% among unvaccinated outpatients with COVID-19 at higher risk of severe disease. That result applies to the specified population and setting; it is not an estimate for all patients or for antiviral drugs generally.
Pregnancy or breastfeeding and flu treatment
The CDC recommends oral oseltamivir for flu treatment during pregnancy, citing its greater body of studies among recommended flu antivirals suggesting safety and benefit. The CDC does not recommend baloxavir during pregnancy or breastfeeding because efficacy or safety data are unavailable. Anyone who is pregnant or breastfeeding and may have flu should discuss treatment promptly with a healthcare professional.
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Why unnecessary antibiotics can be harmful
Taking antibiotics when they are not needed can cause side effects, severe allergic reactions and C. difficile infection, and it contributes to antibiotic resistance. Resistance occurs when bacteria become less susceptible to medicines that once treated them. The CDC advises taking antibiotics only when prescribed and as directed—not saving them for later, sharing them or using them for viral symptoms. Its guidance on antibiotic use and resistance explains these risks.
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One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchCan viruses become resistant to antivirals?
Yes. Resistance can develop to antivirals, but susceptibility depends on the virus and the drug. In a US surveillance update dated June 26, 2026, the CDC reported that nearly all recently circulating seasonal influenza A and B viruses were susceptible to neuraminidase inhibitors and baloxavir, while nearly all circulating seasonal influenza A viruses were resistant to adamantanes. Adamantanes have not been recommended for seasonal flu treatment in the United States for many years. This is a dated influenza surveillance snapshot, not a guarantee about future viruses or other antiviral medicines. See the CDC influenza antiviral resistance page.
What to do if you think you need treatment
- Contact a healthcare professional for an assessment rather than trying to identify a bacterial or viral infection from symptoms alone.
- If flu or COVID-19 is possible and you may be at higher risk of severe illness, seek advice promptly because some antiviral options have short treatment windows.
- Do not use leftover antibiotics, take someone else’s prescription or assume an antiviral for one virus will work for another.
- Ask the clinician or pharmacist about prescription-specific factors such as eligibility, interactions, route of administration and safety considerations.
In the United States, antibiotics and antivirals are prescription medicines rather than over-the-counter treatments, according to the CDC’s patient fact sheet. Prescription availability and rules may differ elsewhere.
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