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Substance P antagonists (aprepitant, fosaprepitant)

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Final answer:

Substance P antagonists, like aprepitant and fosaprepitant, block the activity of substance P and can help reduce pain, alleviate anxiety, and treat certain conditions.

Step-by-step explanation:

Substance P antagonists, such as aprepitant and fosaprepitant, are drugs that block or impede the activity of substance P at its receptor sites in the body. Substance P is a neurotransmitter that plays a role in pain processing, stress reactions, and other physiological functions.

By antagonizing substance P, these drugs can help reduce pain, alleviate anxiety, and treat certain conditions like chemotherapy-induced nausea and vomiting.

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