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Key terms: cough effects codeine opioid related antitussive opium morphine liver hydrocodone dry methadone hydromorphone action dihydrocodeine relative laudanum noscapine analgesic cough syrup cough suppressants ethylmorphine alkaloids same way cough medicines opioid receptor diethylene glycol diphenhydramine preparations changed stronger dihydromorphine Search external links cited by footnotes on Wikipedia page Cough medicine: |
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