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Pharmacology General c1f612e2

An example of covalent drug receptor interaction:

A
Noradrenaline binding to β1 adrenergic receptor
B
Acetylcholine binding to muscarinic receptor
C
Prazosin binding to α1 adrenergic receptor
D
Phenoxybenzamine binding to alpha adrenergic receptor
High-Yield Explanation
Phenoxybenamine is an irreversible (covalent) antagonist at alpha receptors. All other drugs mentioned are reversibly interacting with their receptors.

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