# rxnorm.drugs.class

Retrieve pharmacological and therapeutic classifications for a drug by its RxCUI. Returns mappings to multiple classification systems: ATC (WHO Anatomical Therapeutic Chemical hierarchy used globally), VA Drug Class (US Veterans Affairs system), EPC (FDA Established Pharmacologic Class from drug labels), MOA (Mechanism of Action), and PE (Physiologic Effect). Useful for therapeutic substitution, formulary management, drug utilization reviews, and identifying drug classes for adverse event analysis. Each classification entry includes the class ID, name, type, relationship, and source system.

Agent View of the PolicyLayer registry record for `rxnorm.drugs.class`. HTML page: https://policylayer.com/tools/io-github-whiteknightonhorse-apibase/rxnorm.drugs.class

## Facts

- Tool: `rxnorm.drugs.class`
- Server: Apibase (`apibase-mcp-client`) — https://policylayer.com/tools/io-github-whiteknightonhorse-apibase.md
- Install: `npx -y apibase-mcp-client`
- Homepage: https://github.com/whiteknightonhorse/APIbase
- Risk category: Read (Low risk)
- Registry record: grade F, identity unverified
- Server auth posture: open
- Server rate-limited: no
- Parameters: 3 (1 required)
- Recommended policy verdict: Allowed

## Parameters

| Parameter | Type | Required | Description |
| --- | --- | --- | --- |
| `rxcui` | string | yes | RxNorm concept unique identifier (RxCUI) of the drug ingredient or concept (e.g. "1191" for aspirin). Obtain from rxnorm.drug_search or rxnorm.rxcui_properties. |
| `source` | string | no | Filter by classification source. Options: ATCPROD (ATC WHO), VA (Veterans Affairs), FDASPL (FDA SPL/EPC), DAILYMED (DailyMed), RXNORM (RxNorm). Omit to include |
| `class_types` | string | no | Space-separated list of drug classification systems to query. Options: ATC1-4 (WHO Anatomical Therapeutic Chemical), VA (VA Drug Class), EPC (FDA Established Ph |

Parameters from the server's own tool schema.

## Example call (MCP tools/call, JSON-RPC 2.0)

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "rxnorm.drugs.class",
    "arguments": {
      "rxcui": "<rxcui>"
    }
  }
}
```

## Why rxnorm.drugs.class is rated Low

Tool queries drug classification data with no side effects or modifications to systems.

From the tool's own definition: "Retrieve pharmacological and therapeutic classifications for a drug by RxCUI."

## Use case

AI agents call rxnorm.drugs.class to retrieve information from Apibase without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

## Recommended policy (PolicyLayer)

Verdict: **Allowed**. Enforced by the PolicyLayer MCP gateway (https://policylayer.com/mcp-gateway) before a call reaches Apibase:

```json
{
  "version": "1",
  "default": "deny",
  "tools": {
    "rxnorm.drugs.class": {}
  }
}
```

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## For agents

This record is a snapshot. Live verdicts and the full registry:

- Check every server in your MCP config at once: `npx -y policylayer stack`
- Vet a server before you add it: install the mcp-precheck skill — `npx skills add https://policylayer.com` (skill text: https://policylayer.com/skill.md)
- Query the registry over MCP: endpoint `https://api.policylayer.com/mcp` — tools `check_mcp_server`, `check_mcp_stack`, `check_tool`, `search_registry`, `get_change_events`

---

Source: the PolicyLayer MCP registry — one continuously verified record per MCP server. Full record: https://policylayer.com/registry?q=io-github-whiteknightonhorse-apibase · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/io-github-whiteknightonhorse-apibase