Pharm Action

• Reference to a descriptor describing the functional aspect of a chemical (pharmacological action) which is often coordinated with the chemical
  • Example
    • Aspirin can be used to treat inflammation, dissolve blood clots, or prevent aggregation of blood platelets so the record contains references to Anti-Inflammatory Agents, Non-Steroidal; Fibrinolytic Agents; Platelet Aggregation Inhibitors; Cyclooxygenase Inhibitors; and Antipyretics

NLM Classification #

• The NLM Classification number is shown when a MeSH descriptor points to a single number in the NLM Classification
  • Example
    • The record for Adolescent Health has the NLM Classification number WS 460

Entry Combination

• Certain descriptor/qualifier combinations are prohibited. Instead of this combination, a pre-coordinated Descriptor (following the colon) is to be used.
  • The qualifier prevention & control cannot be used with the descriptor Accidents; instead of this combination, the descriptor Accident Prevention should be used.
  • Example: