As many as 20 parmigiana lovers have been struck down with food poisoning after taking advantage of an inner-city Brisbane pub's two-for-one deal.

Queensland Health's Metro North Public Health Unit is investigating after diners complained of getting sick from the parmies at Fortitude Valley's The Flying Cock.

The Flying Cock is investigating diner complaints of gastro after eating the restaurant's two-for-one parmy deal. Credit:Facebook

Neither the unit nor Brisbane City Council received any complaints but public health physician Dr James Smith said the venue, which describes its food as "gourmet pub grub", had calls from up to 20 people complaining of suffering gastro on December 2.

Guy Shoshani and his friends were some of the unfortunate victims.