When ingested with alcohol, certain drugs (e.g. cephalosporins, sulfonylurea, metronidazole, griseofulvin, chloramphenicol), calcium cyanamide, dimethyl formamide and certain mushrooms cause a disulfiram-alcohol type reaction. Three cases of a disulfiram-alcohol type reaction after ingestion of Boletus luridus and alcohol are described. No serious symptoms were observed. In contrast to Coprinus atramentarius, the toxin of Boletus luridus is unknown.