Look up the WHO ATC (Anatomical Therapeutic Chemical) classification(s) for a drug by name.
Use this tool to:
- Find the ATC code for a medication (e.g., "metformin" → A10BA02)
- Identify the therapeutic and pharmacological class hierarchy
- Cross-reference drugs with their international ATC codes
Returns one entry per ATC code the drug belongs to. A single-ingredient drug typically maps to one substance-level code; combination products map to multiple. ATC codes are international (WHO Collaborating Centre); this tool retrieves them via NLM RxClass.
Input is a drug NAME (brand or generic, English/US naming as in RxNorm). A name RxNorm does not recognize, or a drug without an ATC mapping, returns an empty `matches` list with an explanatory note — not an error; try the generic name, or resolve the name first with rxnorm_search.
Which ATC tool: start here when you have a drug name; use atc_lookup when you already have a class code (level 1-4, e.g. "A10BA") and want its name; use atc_members to list the drugs inside a class.
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