Bismuth subcitrate, tetracycline and metronidazole are all classified as probably not porphyrinogenic, and therefore this combination product is also regarded probably not porphyrinogenic. For details of the characteristics of each substance and the rationale behind the classifications, please search the individual substances bismuth subcitrate (ATC A02BX05), tetracycline (ATC J01AA07) and metronidazole (J01XD01) in this database.