Encyclopedia > Opiate

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Opiates are a class of drugs that are derivatives (in the broadest sense of the word) of opium. These include two groups of alkaloids: phenanthrenes[?] and papaverines[?]. Opiates in the narrower sense of the word are only the phenanthrenes[?]. Opioids are synthetic drugs that are chemically unrelated to the opiates, but act on the same receptors in the central nervous system and have similar clinical effects.


Naturally occurring in opium:

Semisynthetic[?] derivatives:

Fully synthetic[?]:


  • Methadone
  • levomethadyl acetate hydrochloride (LAAM)



A high number of opiates are considered to be highly addictive. One exception is loperamide[?], which cannot cross the blood-brain barrier.

See also nootropics

Opiate is an EP by Tool, an American rock band formed in 1989. See Opiate (album)

Opiate is also the name of a rock-metal band based in the United Kingdom and signed to Visible Noise[?] records, home of lost prophets[?]. See Opiate (band)[?].

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Partial order

... b ≤ a then a = b (antisymmetry) A set with a partial order on it is called a partially ordered set, poset, or, often, simply an ordered set. Examples of posets ...