Teenager Samatha Millard, who was left fighting for her life after taking swine flu drug Tamiflu, was yesterday improving in hospital.

A spokesman for Chelsea and Westminster Hospital last night said the 18-year-old’s condition had changed from ‘critical’ to ‘critical but stable’.

Miss Millard, of Purslane Drive, Bicester, suffered blisters all over her body and severe breathing difficulties after taking the drug two weeks ago.

Doctors fear she is suffering from Stevens-Johnson syndrome, which causes the skin to peel off.

Her stepfather, Bart van Horenbeeck, said the family was planning to visit her today.

The news came as the Medicines and Healthcare products Regulatory Agency announced it was investigating.

Spokesman Jennifer Kyne said: “We take every report of a suspected side effect very seriously.”