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**An anaphylactic reaction:** This involves the liberation of histamine, 5-hydroxytryptamine (5-HT) and associated vasoactive substances from mast cells and basophils, following exposure to a foreign substance (the drug) to which the individual has become sensitized. It is usually an IgE-mediated reaction.

**An anaphylactoid reaction:** This is clinically indistinguishable from the above, but the release of histamine, etc. from mast cells is triggered by non-IgE mechanisms.

![Anaphylactic vs Anaphylactoid][1]

[1]: http://www.ebmedicine.net/spaw/uploads/aboutUs/When%20Is%20It%20An%20Anaphylactic%20Or%20Anaphylactoid%20Reaction%20Pediatric%20Emergency%20Medicine%20Practice.JPG

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