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This application is a service of the Singapore Government.

Health Sciences Authority

Understanding Antiviral Drugs

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Like all other medicinal products, antivirals bring beneficial effects in the management of the disease condition, however, they may also cause side effects in certain patients. 

Given the current H1N1 pandemic with its associated increase in the use of antivirals, including oseltamivir (Tamiflu®) and zanamivir (Relenza®) to treat patients at risk of developing serious complications of influenza, the Health Sciences Authority (HSA) is providing a list of Frequently Asked Questions to address some of common concerns associated with the use and effectiveness of these medicines.