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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.
Analgesic action: Morphine is the principal opium alkaloid, the standard for opiate agonist analgesic activity. Mechanism of action is thought to be via the opiate receptors, altering patientâs perception of pain. Morphine is particularly useful in severe, acute pain or severe, chronic pain.Morphine also has a central depressant effect on respiration and on the cough reflex center.echanism of action is thought to be via the opiate receptors, altering patientâs perception of pain. Morphine is particularly useful in severe, acute pain or severe, chronic pain. Morphine also has a central depressant effect on respiration and on the cough reflex center.