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Definition: possibly due to a hypersensitivity to histamine; characterized by recurrent, severe, unilateral orbitotemporal headaches associated with ipsilateral photophobia, lacrimation, and nasal congestion.
Synonym(s): histaminic cephalalgia, histaminic headache, Horton cephalalgia, Horton headache
Examples: glitazone, GI cocktail, etc.
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