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Substance Name: Opium [USP]
RN: 8008-60-4
UNII: 37M3MZ001L


  • The air-dried exudate from the unripe seed capsule of the opium poppy, Papaver somniferum, or its variant, P. album. It contains a number of alkaloids, but only a few - MORPHINE; CODEINE; and PAPAVERINE - have clinical significance. Opium has been used as an analgesic, antitussive, antidiarrheal, and antispasmodic.

Molecular Formula

  • Unspecified

Classification Codes

Classification Codes

  • Analgesics
  • Analgesics, Opioid
  • Antidiarrheals
  • Antitussive Agents
  • Central Nervous System Agents
  • Central Nervous System Depressants
  • Gastrointestinal Agents
  • Mutation Data
  • Narcotics
  • Peripheral Nervous System Agents
  • Respiratory System Agents
  • Sensory System Agents

Superlist Classification Code

  • DEA Schedule II
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Links to Resources

Names and Synonyms

Name of Substance

  • Opium
  • Opium [USP]

MeSH Heading

  • Opium


  • Crude opium
  • EINECS 232-368-5
  • Opium
  • UNII-37M3MZ001L

Systematic Names

  • Opium
  • Opium, crude

Superlist Names

  • DEA No. 9639
  • Opium, powdered
  • Powdered opium

Registry Numbers

CAS Registry Number

  • 8008-60-4


  • 37M3MZ001L

System Generated Number

  • 0008008604