This allows the flu virus to acquire large genetic changes very quickly and can therefore spread rapidly through populations.

Swine influenza A viruses detected in the US and Mexico were first tested with two antiviral drugs – amantadine and rimantadine – and appeared resistant. Luckily, the 'N' in the H1N1 strain that is causing today's health scare is known to be sensitive to Relenza and Tamiflu. In fact, patients being treated by these anti-viral medicines around the world appear to be responding well.

For this medicine we need prescription.

Available from Cipla and Roche