Opioids (N02A) |
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Opium derivatives | Whole Opium Preparations | | | | Natural Opiates | | | | Semisynthetics | | Morphine Family | | | | 3,6 Diesters of Morphine | | | | Codeine-Dionine Family | | | | Morphinones | | | | Codeinones | | | | Dihydrocodeine Series | | | | Nitrogen Morphine Derivatives | | | | Hydrazones | | | | Others | |
| | Active Opiate Metabolites | |
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| Morphinans | |
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| Benzomorphans | |
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| 4-Phenylpiperidines | |
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Open Chain Opioids | | Amidones | | | | Methadols | | | | Moramides | | | | Thiambutenes | | | | Phenalkoxams | | | | Ampromides | | | | Others | |
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| Anilidopiperidines | |
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Oripavine derivatives | |
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| Phenazepines | |
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| Pirinitramides | |
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| Benzimidazoles | |
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| Indoles | |
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| Diphenylmethylpiperazines | |
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Opioid peptides see also: The Opioid Peptides | |
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| Others | |
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Opioid Antagonists & Inverse-Agonists | |