A leading British medical journal is asking the drug maker Roche to release all its data on the flu drug Tamiflu, claiming there is insufficient information on its safety. The drug has been stockpiled by dozens of governments worldwide in case of a global flu outbreak and was widely used during the 2009 swine flu pandemic.

On Monday, one of the researchers linked to the BMJ called for European governments to sue Roche.

"I suggest we boycott Roche's products until they publish missing Tamiflu data," wrote Peter Gotzsche, leader of the Nordic Cochrane Centre in Copenhagen.

In a statement, Roche said it had complied with all legal requirements on publishing data and provided Gotzsche and his colleagues with 3,200 pages of information to answer their questions.