The first pill designed to treat symptomatic Covid has been approved by the UK medicines regulator, BBC reports.

The tablet - molnupiravir - will be given twice a day to vulnerable patients recently diagnosed with the disease. In clinical trials the pill, originally developed to treat flu, cut the risk of hospitalisation or death by about half.

Health Secretary Sajid Javid said the treatment was a "gamechanger" for the most frail and immunosuppressed.

In a statement he said: "Today is a historic day for our country, as the UK is now the first country in the world to approve an antiviral that can be taken at home for Covid."

Molnupiravir, developed by the U.S. drug companies Merck, Sharp and Dohme (MSD) and Ridgeback Biotherapeutics, is the first antiviral medication for Covid which can be taken as a pill rather than injected or given intravenously.