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7450 Pharmacology

True statement regarding methadone are all except:

AIt is a long acting mue-receptor agonist
BIt is rapidly absorbed from the gastrointestinal tract and is detected in plasma 30minutes after oral administrations
CThe primary use of methadone is relief of chronic pain
DThe onset of analgesia is 30-60 minutes after parenteral administration and 1-2 hours after oral administration (Correct Answer)