opiods are substances that act on opiod receptors and produce morphine like effects.these are generally used to relieve pain.the drugs are derived from opium alkaloid.these drugs mainly includes synthetic and semisynthetic drugs such as hydrocodon,oxycodon and fentanyl.antagonist drugs such as naloxone. besides used as pain reliever these are used for treating cough also medical uses: pain,acute pain,chronic non cancer pain etc. other:cough,diarrhoea and shortness of breadth adverse effects:nausea and vomitting,drowsiness,itching,constipation,respiratory depression,opiod induced hyperalgesia.
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