Viagra cures hamster jetlag

Viagra could be used to help people flying eastwards recover from jetlag, animal research suggests.

A team of Argentine scientists found the drug helped hamsters recover up to 50% faster from forward shifts in their daily time cycles.

However, the drug only worked in conjunction with light therapy, and only in one time direction - the equivalent to flying eastbound.

The researchers from the National University of Quilmes shifted the light-dark cycle of hamsters six hours forwards, by switching on lights six hours earlier than usual.

They then monitored the hamsters' running wheel activity to assess when their body clocks had adjusted to the new time cycle - the hamsters are active in the day but stop running when the lights go out.

Injection of Viagra before the time shift meant the hamsters adjusted to the new time cycle faster, even when low doses of the drug, which did not cause penile erections, were used.

With news video.