Below are the main rubriks (i.e strongest indications or symptoms) of Arsenicum Iodatum in traditional homeopathic usage, not approved by the FDA.
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Bad feeling in head, like a bad cold (third evening),
Headache all over the head (after twenty-five hours),
Woke in the morning with a bad headache, which lasted all day; dull, heavy, with pressing from within outwards, worse on motion, stooping or studying (fourth day),
Head seemed enormously large and heavy, with pain,
Dulness of the head, with dull pain in the left malar bone, and occasional slight frontal headache, the entire morning,
Pain in head prevented sleep (fourth day),
Severe frontal headache, with dulness of the entire head during the forenoon, with stiffness of the left side of the neck, worse when moving the head,
An exceedingly sharp pain in the forehead and in both ears, especially the left ear, when riding, in a sharp cold wind (after three hours),
Several times had a pain in the right temple,≡ more ...