#antagonist  a drug that neutralizes or counteracts the effects of another drug
  exclusion:  #synergist
  supertype:  #drug  a substance that is used as a medicine or narcotic
  subtype:  #estrogen_antagonist__tamoxifen  an antagonist for estrogen that is used in the treatment of breast cancer
  subtype:  #narcotic_antagonist  an antagonist used to counteract the effects of narcotics (especially to counteract the depression of respiration)
     subtype:  #nalorphine__Nalline  a narcotic antagonist (trade name Nalline) that counteracts the effects of narcotics (especially the effects of poisoning by morphine)
     subtype:  #naloxone__Narcan  a potent narcotic antagonist (trade name Narcan) especially effective with morphine
     subtype:  #naltrexone  an oral antagonist against the action of opiates

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