Thanks for pointing this out! I don't think this should have a warning panel because the risk for the average person is not high enough since the majority of people are not taking MAOIs. In my opinion, warning panels should be used as sparingly as possible because I think that people will ignore them if there are too many warnings. I will, however, add this information to the introduction paragraph, the substance box in red text alongside the dosage information, and the harm potential section.
Sounds reasonable to me =]