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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.
Morphine, like other opioids, stimulates receptors on nerves in the brain to increase the threshold to pain (increasing the amount of stimulation it takes to feel pain) and reduce the perception of pain (the perceived importance of the pain). The FDA approved injectable morphine in October 1986.