## MedicationSearchParams.gcnSeqnos property

Vendor formulation keys under `<name-search hit>`. Only used when the drug has no dose-level products: each key is resolved to its marketed strength so the caller still gets selectable formulations instead of an empty result. Ignored otherwise.

**Signature:**

```typescript
readonly gcnSeqnos?: number[];
```  
- [MedicationSearchParams.gcnSeqnos property](/content/docs/sdk/core.medicationsearchparams.gcnseqnos#medicationsearchparamsgcnseqnos-property/index.html)