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opioid (Morphine (respiratory depression, antitussive, Euphoria:, Miosis:,…
opioid
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Meperidine
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causes mydriasis because of an anticholinergic action (which result in nausea, dry mouth and blurred vision).
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Methadone
mediated by μ receptors and by antagonizing NMDA receptor, which is useful in the treatment of neurogenic pain.
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Oral oxycodone is sometimes formulated with aspirin or acetaminophen, with an analgesic effect approximately twice that of morphine.
Oral oxymorphone and hydromorphone are approximately eight to ten times more potent than oral morphine as an analgesic, which is preferred over morphine in patients with renal dysfunction.
Oral hydrocodone is much weaker an analgesic than hydromorphone, It is often combined with acetaminophen and also used as antitussive.