Doctors warn against unsupervised use of anti-flu drugs

As influenza activity surges across China and sales of antiviral medications like Oseltamivir rise, local medical professionals are urging the public not to stockpile anti-flu drugs or use them without guidance.

According to the latest data from the Chinese Center for Disease Control and Prevention, more than 51% of nationwide outpatient and emergency cases presenting with flu-like symptoms have tested positive for influenza.

A nurse speaks with a parent at the pediatric ward of the Affiliated Hospital of Inner Mongolia Medical University on Dec. 1, amid a spike in flu cases. National flu positivity rates have neared 51%, with some regions reaching high epidemic levels, according to China CDC. China News Agency

Qi Lifeng, a doctor at Shenzhen Children's Hospital, emphasized that while Oseltamivir is an effective treatment for influenza, it is not a “miracle cure.” He also stressed the importance of using the medication under a doctor’s supervision.

“Oseltamivir is a prescription drug, and its most common side effects include nausea, vomiting, and other gastrointestinal reactions,” Qi explained. “It is not intended for long-term use, and improper or excessive use may lead to viral mutations and drug resistance. Therefore, it should only be taken under medical guidance.”

He strongly cautioned parents against administering Oseltamivir as soon as a child develops a fever. “Fever and cough can have many causes — influenza is just one of them. Oseltamivir is only effective against influenza A and B; it does not work against the common cold or bacterial infections.”

Parents with their children line up outside a treatment room at Shenzhen Children's Hospital as flu season drives a surge in pediatric patients. Photo from WeChat account “第一现场"

However, for patients confirmed to have influenza A, Qi noted that taking Oseltamivir early — ideally within 48 hours of symptom onset — can shorten illness duration, reduce the risk of complications, and lower mortality. In severe cases, in hospitalized patients or those at high risk of complications, the drug may still be considered even after 48 hours.

For uncomplicated seasonal flu, the standard course is five days, taken twice daily. Patients should complete the full regimen — even if symptoms improve. Recurrent fever is common during the initial phase of treatment, and fever-reducing medications such as ibuprofen can be used for relief.