Which statement about Benadryl's effect on prolactin during lactation is supported by the data?

• A. Benadryl has no effect on prolactin levels
• B. Benadryl increases prolactin levels
• C. Benadryl may reduce prolactin levels
• D. Benadryl causes lactation to cease immediately

Answer: (C)

The main idea here is how some medications can influence prolactin, the hormone that drives milk production, during lactation. Prolactin levels are normally regulated by dopamine: higher dopaminergic activity tends to suppress prolactin, while blocking dopamine receptors or otherwise reducing dopaminergic signaling can raise prolactin. Diphenhydramine (Benadryl) is a first‑generation antihistamine that can affect the central nervous system and, in the limited lactation data available, has been associated with a tendency toward lower prolactin levels rather than an increase or no change. Because the data don’t show a clear, strong effect and don’t indicate an immediate cessation of milk production, the statement that Benadryl may reduce prolactin levels best fits what has been observed. It’s a cautious, modest effect rather than a strong or predictable one.