A nurse is caring for a client with bipolar disorder who is prescribed fluoxetine, an SSRI. The client has recently started taking St. John's wort on a friend's recommendation. Which nursing action is the priority to prevent a serious adverse effect?

Instruct the client to immediately discontinue St. John's wort and notify the provider due to risk of serotonin syndrome

Encourage the client to increase the fluid intake to prevent dehydration from diarrhea

Advise the client to continue St. John's wort but monitor for mild gastrointestinal side effects.

Suggest the client reduce the dose of fluoxetine while taking St. John's wort to minimize serotonin effects.