What action should a nurse take when preparing to administer escitalopram to a client who has taken St. John's wort?

When a client is prepared to take escitalopram after using St. John's wort, holding the escitalopram dose and consulting with the provider is the appropriate action. This is due to the potential interaction between St. John's wort and escitalopram, as both affect serotonin levels. Using them together could increase the risk of serotonin syndrome, a potentially life-threatening condition characterized by confusion, rapid heart rate, and muscle rigidity, among other symptoms.

Consulting with the provider is crucial as it ensures that the client's safety is prioritized and allows for an appropriate evaluation of the situation before administration. The provider may decide to adjust medication, change the treatment plan, or provide further instructions for safe administration. This careful approach aligns with best practices in medication management, particularly when dealing with herbal supplements that can significantly interact with prescribed medications.