A client with depression has been taking citalopram, an SSRI, for several months and has presented for a follow-up assessment. The client tells the nurse, "I've been reading a lot online about the benefits of St. John's wort for depression, so I've started taking it once per day." In addition to referring the client to the provider, what is the nurse's best response?

A. "There can be an unsafe reaction between your antidepressant and St. John's wort, which is why taking them both is discouraged." is correct; St. John's wort can reduce the effectiveness of SSRIs and may increase the risk of serotonin syndrome, making it vital for the nurse to address this safety concern.

B. "Herbal remedies often contain unknown doses of the desired ingredient, which can be dangerous." is a valid point, but it does not specifically address the interaction with the client’s current medication.

C. "It's very important that you not take the St. John's wort at the same time of day as your antidepressant." is misleading; the concern is not just about timing but about taking both together at all.

D. "It's very important that you comply with your prescribed treatment." while true, this response does not directly address the specific risks associated with combining St. John's wort and citalopram.