## MedplumClient.fhircastUnsubscribe() method [​](/content/docs/sdk/core.medplumclient.fhircastUnsubscribe#medplumclientfhircastUnsubscribe-method "Direct link to MedplumClient.fhircastUnsubscribe(/index.html) method")

Unsubscribes from the specified topic.

**Signature:**

```typescript
fhircastUnsubscribe(subRequest: SubscriptionRequest): Promise<void>;
```

## Parameters [​](/content/docs/sdk/core.medplumclient.fhircastUnsubscribe#parameters "Direct link to Parameters"/index.html)

| Parameter | Type | Description |
| --- | --- | --- |
| subRequest | [SubscriptionRequest](/content/docs/sdk/core.subscriptionrequest) | A `SubscriptionRequest` representing a subscription to cancel. Mode will be set to `unsubscribe` automatically. |

**Returns:**

Promise<void>

A `Promise` that resolves when request to unsubscribe is completed.

- [MedplumClient.fhircastUnsubscribe() method](/content/docs/sdk/core.medplumclient.fhircastUnsubscribe#medplumclientfhircastUnsubscribe-method/index.html)
- [Parameters](/content/docs/sdk/core.medplumclient.fhircastUnsubscribe#parameters/index.html)