Final answer:
Biotechnological drugs such as Enbrel require a boxed warning because it suppresses the immune system leaving the patient susceptible to rare bacterial infections.
Step-by-step explanation:
Biotechnological drugs such as Enbrel require a boxed warning because it suppresses the immune system leaving the patient susceptible to rare bacterial infections. A boxed warning is the strongest warning required by the FDA and is used to alert healthcare providers and patients about serious or life-threatening risks associated with a drug.