Influenza
Influenza, commonly called the flu, is a contagious respiratory infection caused by influenza A or B viruses. It spreads rapidly in crowded environments and peaks during cooler months, in Southeast Asia this often coincides with the wet season or air-conditioned indoor gatherings rather than a single winter window.
Medicine used to treat Influenza
Symptoms and when they strike
Flu tends to arrive abruptly. Fever above 38 C, chills, muscle aches, headache, and a dry cough typically appear within one to two days of exposure. Fatigue can be severe enough to keep people in bed for several days. Sore throat and a runny nose are common; vomiting and diarrhoea occur more often in children. Most otherwise healthy adults recover fully within one to two weeks.
Seek medical attention promptly if symptoms include difficulty breathing, chest pain, persistent high fever, confusion, or cyanosis, these can signal serious complications such as pneumonia.
Antiviral treatment
Antivirals work best when started early, ideally within 48 hours of the first symptoms. Oseltamivir (Tamiflu) is the most widely used option; it reduces the duration and severity of illness by inhibiting the neuraminidase enzyme that allows the virus to spread between cells. Rest, adequate fluids, and paracetamol or ibuprofen for fever and pain support recovery alongside antiviral therapy.