## MedicationOrderDrugInput.gcnSeqno property [​](/content/docs/sdk/core.medicationorderdruginput.gcnseqno#medicationorderdruginputgcnseqno-property "Direct link to MedicationOrderDrugInput.gcnSeqno property"/index.html)

Vendor formulation key, paired with to order a drug that has no dose-level product to resolve an NDC from — OTC / topical / wide-multi-strength generics for which the vendor's dose-format lookup returns nothing. Supply alongside it, since there is no catalog row to derive a name from.

**Signature:**

```typescript
readonly gcnSeqno?: number;
```

- [MedicationOrderDrugInput.gcnSeqno property](/content/docs/sdk/core.medicationorderdruginput.gcnseqno#medicationorderdruginputgcnseqno-property/index.html)