Opiates
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Mode Of Action
Morphine is an endorphin copycat. It binds to μ-opiod receptors in the central nervous system and in the GI tract. It also affects the respiratory system. This is why you get pain relief/hallucinations and constipation, and occasional respiratory depression in overdose.
It can be taken by mouth, rectally, epidurally, subcutaneously and intravenously.