[Possibility of timolol use for immediate alleviation of Horton's cluster headache. Preliminary report]

The author gave timolol to 4 patients with cluster headaches instilling it in the form of a 0.5% solution into the conjunctival sac during attacks. Usually the attacks were significantly shortened and alleviated. Trials with placebo gave negative results. The method requires verification in a larger material but even now it appears to be worth of recommendiation.