Receptor antagonists are substances that bind to specific receptors in the body but do not activate them. Instead, they block or inhibit the action of other molecules, such as neurotransmitters or hormones, that would normally trigger a response. This can help regulate various physiological processes and is often used in medical treatments. These antagonists are important in pharmacology, as they can be used to manage conditions like high blood pressure, anxiety, and allergic reactions. By preventing the activation of certain receptors, receptor antagonists can reduce symptoms and improve patient outcomes in various diseases.