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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.
Mechanism of Action. Morphine sulfate, an opioid agonist, is relatively selective for the mu receptor, although it can interact with other opioid receptors at higher doses.orphine acts as a full agonist, binding with and activating opioid receptors at sites in the peri-aqueductal and peri-ventricular grey matter, the ventro-medial medulla and the spinal cord to produce analgesia.