Final answer:
Antihypertensive medication is not used in the treatment of endocrine disorders, as it does not directly address hormonal imbalances and is instead used to manage high blood pressure.
Step-by-step explanation:
The agent that would NOT be used in the treatment of endocrine disorders is C) Antihypertensive medication. Endocrine disorders involve hormones and their balance or imbalances within the body. Insulin and glucagon, which are produced by the pancreas, help regulate blood glucose levels, making them crucial for treating disorders like diabetes. Thyroxine, a thyroid hormone, is involved in regulating metabolism and would be used in cases of thyroid dysfunction.
Antihypertensive medications, on the other hand, are used to treat high blood pressure and do not directly treat endocrine disorders. While hypertension can be a component of some endocrine disorders, antihypertensives themselves do not target the hormonal causes or effects of endocrine disorders.