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How does morphine controlled release work?

Morphine controlled release belongs to a family of medications called opiate analgesics, which relieve pain. No one is sure how opiate analgesics work, but they appear to act on the brain and spinal cord to change how the body perceives pain signals. Opiate analgesics can affect other body systems, too, such as the airways and digestive tract. These actions may cause unwanted side effects, such as difficulty breathing and constipation.
The controlled release dosage form works by slowly releasing the active ingredient over a number of hours, often 12 or 24 hours.

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