Danish brewer Carlsberg is recalling more than 4600 kegs of beer after two people drank from kegs filled with a corrosive cleaning solution.
The Staropramen beer is being recalled in Sweden after the two injuries.
Carlsberg Sweden called the situation "extremely serious because the content is corrosive".
It said a restaurant keeper and a Carlsberg employee received blisters on their tongues after sampling the content and were taken to hospital, but received "no permanent injuries".
The company said the recall affected 30-litre kegs sold to 680 bars and restaurants in Sweden.
Of the 4624 kegs, about 3000 have not yet been delivered but are kept in Carlsberg's storage.
Staropramen is made in the Czech Republic, but distributed by Carlsberg in Sweden