D-tubocurarine,
scopolamine, decamethonium, resperpine.
X-Ray Contrasts and Agents: Radiographic dyes, gallamine.
Venoms: Snakebites, bee stings, jellyfish stings.
Histamine Containing Foods: Parmesan, Blue, and Roquefort cheeses, spinach, eggplant, some red wine, tuna, mackeral, bonita, skipjack.
Histamine Releasing Foods: Ethanol, egg white, crustaceans (crayfish, lobsters), chocolate, strawberries, tomatoes, citrus.