Why Canadian doctors often advise fluids and Tylenol instead of antibiotics

Antibiotics do not work on colds and flu

When a doctor suggests rest, fluids and Tylenol (acetaminophen) for fever and pain, it is usually because the illness is viral. Colds and flu are caused by viruses, and antibiotics target bacteria, so they have no effect on them.^[1][2]

US CDC data show that 90–98% of adult sinus infections are viral and only 5–10% of adult sore throats are caused by strep.^[1] In practice, a sore throat is usually swabbed first and antibiotics are considered only if the test is positive; for sinusitis, antibiotics are generally considered only if symptoms last beyond 7–10 days.

More prescriptions in China does not mean better care

A 2021 Lancet Infectious Diseases analysis of 139 hospitals and 170 million outpatient visits in China found that 51% of antibiotic prescriptions were inappropriate, rising to 71% for children under 6.^[3]

Intravenous treatment for colds has also been tightened. From 2016, Jiangsu stopped outpatient IV antibiotics at hospitals of level two and above, and Anhui listed 53 conditions that should not be treated with IV fluids, colds among them.^[4][5]

Antibiotics have costs too

A 2017 Johns Hopkins study in JAMA Internal Medicine found that 1 in 5 hospitalized patients given antibiotics had an adverse effect, and 4% developed C. difficile infection within three months.^[6] The study covered hospitalized adults, so it does not apply directly to every outpatient.

Does Tylenol in pregnancy cause autism?

In 2025 a government statement linked Tylenol use in pregnancy to autism. A 2024 Swedish study in JAMA followed about 2.48 million children and compared siblings within families; it found no association.^[7]

In its September 2025 advisory, Health Canada still lists acetaminophen as the recommended treatment for fever and pain in pregnancy, and an unresolved fever also carries risks for the fetus.^[8] Pregnant women should discuss any medication with their doctor or pharmacist.

Dosing and when to go back

Under Health Canada's labelling standard, adults take at most 4000 mg of acetaminophen a day, which is eight 500 mg tablets. People who drink alcohol regularly should be more careful, because acetaminophen can harm the liver.

Doctors and Health Canada generally advise going back if: a fever lasts more than 3 days; pain in the ear, sinuses or throat keeps getting worse; a cough lasts 2 weeks; or you improve and then suddenly get worse a few days later. Tell the doctor about these changes directly.