I’m looking for a fairly quick qualified answer at 2 in the morning. I just got off the phone with my insurance companies ask a nurse program. She told me about as much as the side of the box, “consult a doctor if breast feeding”. She did confirm that many over the counter sleeping aids have benadryl. They gave my wife darvicet for pain after the c-section and that’s a narcotic. Isn’t it like a synthetic opiate? Anyhow that was ok while she was breast feeding so I’m thinking benadryl should be less dangerous.