A biological is a drug that inhibits the action of inflammatory proteins or immune cells in the body. It consists in whole or in part of animal or human protein. Biologicals can be used, for example, in inflammatory diseases such as rheumatoid arthritis, Crohn's disease or psoriasis.

The Divi "Treatment with biologicals" contains an animation explaining what a biological is. In addition, the Divi explains the effects of this medication in daily life, rules of life and the screening they receive before starting the biologicals.