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Dupilumab, also known as Dupixent?, is a treatment for severe atopic eczema. 

Biologics work by blocking ILs from binding to their cell receptors (protein molecules that receive chemical signals from outside a cell); this stops the immune system from overreacting. Dupilumab works on two specific ILs thought to contribute to atopic conditions: IL-4 and IL-13. By blocking IL-4 and IL-13 from binding to their cell receptors, dupilumab limits the overreaction of the immune system, dampening down the chronic inflammatory response and lessening the symptoms of atopic eczema.

Dupilumab shows a non-linear rate in regard to the target.Dupilumab is also reported to have a bioavailability of 64%, with the average concentration occurring one week after in one week after injection.

The most common side effects reported by the US Food and Drug Administration (FDA) include injection site reactions, upper respiratory tract infections, joint pain, and herpes viral infections.The most common side effects reported by the European Medicines Agency (EMA) include injection-site reactions (such as redness, swelling including due to fluid build-up, itching and pain), conjunctivitis (redness and discomfort in the eye) including conjunctivitis due to allergy, joint pain, cold sores, and increased blood levels of a type of white blood cell called eosinophils.