Abstract
It is well-known that attacks of vertigo are frequently caused by fluctations of blood pressure. Dihydergot was given to patients with vertigo of unknown origin to evalute its effect. Subjective improvement and Schellong's test were used as criteria of effectiveness. The results of Schellong's test were compared before and after the oral administration of Dihydergot, 6mg day for 2 weeks. Difference between them was evaluated by the criteria proposed by the committee on orthostatic disturbances. In the positive group, vertigo was usually relieved immediately. However, no significant difference was found between the positive and negative groups as to tinnitus, nausea or nystagmus. These suggest that of Dihydergot is effective in the treatment of vertigo of unknown cause.
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