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Mar 13, '09. The headache comes because Morphine produces vasodilation. This is why we give Morphine for chest pain patients. The vasodilation is great to reduce constriction due to angina, but it causes headaches due to the vasodilation.
An antagonist is an agent that binds to a receptor but does not elicit the response that the neurotransmitter or an agonist would cause. The antagonist blocks the receptor and prevemts activation by neurotransmitters or other drugs.So in the case of opiates, lets look at the opiate agonist, morphine.When morphine enters the brain, it binds to opiate receptors and activates them. This binding is what produces the effects of Morphine.o in the case of opiates, lets look at the opiate agonist, morphine. When morphine enters the brain, it binds to opiate receptors and activates them. This binding is what produces the effects of Morphine.