different between opioid vs methylnaltrexone

English

From opium +? -oid.

opioid (plural opioids)

A substance that has effects similar to opium.
(physiology) Any of the natural substances, such as an endorphin, released in the body in response to pain.
(pharmacology) Any of a group of synthetic compounds that exhibit similarities to the opium alkaloids that occur in nature.

From methyl +? naltrexone.

methylnaltrexone (uncountable)

(pharmacology) A peripherally-acting ?-opioid antagonist that acts to reverse some of the side effects of opioid drugs such as constipation without affecting analgesia or precipitating withdrawals.

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