Classification-Index

Classification 2025 Winter Edition

Worldwide source of medical classification resources

Class Index

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Opiates, Alkaloid See Opiate Alkaloids

Opiates, Endogenous See Opioid Peptides

Opinion Mining See Sentiment Analysis

Opinions See Attitude

Opioid See Analgesics, Opioid

Opioid Abuse See Opioid-Related Disorders

Opioid Addiction See Opioid-Related Disorders

Opioid Analgesic See Analgesics, Opioid

Opioid Analgesics See Analgesics, Opioid

Opioid Antagonist See Narcotic Antagonists

Opioid Antagonists See Narcotic Antagonists

Opioid Crisis See Opioid Epidemic

Opioid Dependence See Opioid-Related Disorders

Opioid Epidemic WM 284

Opioid Full Agonists See Analgesics, Opioid

Opioid Misuse See Opioid-Related Disorders

Opioid Mixed Agonist-Antagonists See Analgesics, Opioid

Opioid Overdose See Opiate Overdose

Opioid Partial Agonists See Analgesics, Opioid

Opioid Peptide See Opioid Peptides

Opioid Peptides

Biochemistry

QU 68

Pharmacology

QV 126

Opioid Receptor Antagonist See Narcotic Antagonists

Opioid Receptor Antagonists See Narcotic Antagonists

Opioid Reversal Agent See Narcotic Antagonists

Opioid Reversal Agents See Narcotic Antagonists

Opioid Use Disorder See Opioid-Related Disorders

WM 284

See also names of specific narcotics

Opioids See Analgesics, Opioid

Opisthorchiasis WC 805

Opisthorchis QX 353

Opisthorchis felineus See Opisthorchis

Opisthorchis felineus Infection See Opisthorchiasis

Opisthorchis Infection See Opisthorchiasis

Opisthorchis viverrini See Opisthorchis

Opisthorchis viverrini Infection See Opisthorchiasis

Opium

As a medicinal plant

QV 766.5.R3

Geographic distribution

QV 770

Legislation

QV 732 - QV 733

See also Opiate Alkaloids

See also Opium Dependence

Opium Abuse See Opium Dependence

Opium Addiction See Opium Dependence

Opium Dependence WM 286

Opium Poppy See Papaver

Opium Smoking See Opium Dependence

Opium Use See Opium Dependence

Opossums QL 737.M34

Oppenheim Disease See Neuromuscular Diseases

Oppenheim's Disease See Neuromuscular Diseases

Oppenheim-Ziehen Disease See Dystonia Musculorum Deformans

Opportunistic Infections

General

WC 195

Parasitic

WC 695

Viral

WC 500

See AIDS-Related Opportunistic Infections

See AIDS-Related Opportunistic Infections

Opsoclonus See Ocular Motility Disorders