Botulinum is classified as:

Botulinum is classified as a potent bacterial toxin because it is produced by the bacterium Clostridium botulinum. This toxin is known for causing severe illness, including botulism, a potentially fatal condition characterized by muscle paralysis. The potency of botulinum toxin is notable; it is considered one of the most dangerous substances known, and even small amounts can have significant effects on the nervous system, leading to respiratory failure, among other symptoms.

This classification is critical in understanding its implications in both medical and public health contexts. In clinical settings, botulinum toxin has been utilized for various medical treatments, including muscle spasms and cosmetic procedures, demonstrating that while it is dangerous, it can also have beneficial applications when used appropriately.