Antitoxins are primarily used to treat diseases caused by bacterial toxins. Some of the notable diseases include: - Diphtheria: Caused by Corynebacterium diphtheriae, this disease can be treated with diphtheria antitoxin. - Tetanus: Caused by Clostridium tetani, tetanus antitoxin (also known as tetanus immune globulin) can be life-saving. - Botulism: Caused by Clostridium botulinum, botulism antitoxin can mitigate the effects of botulinum toxin.