Background: Tetracyclines may be useful in preventing pathological vascular remodeling, thus decreasing the risk of spontaneous hemorrhage from brain vascular malformations. Methods: Arteriovenous malformation (AVM) and intracranial aneurysm patients undergoing noninvasive management were treated with minocycline or doxycycline (200 mg/day) up to 2 years in a prospective open-label safety pilot trial. The primary outcome was to compare dose-limiting intolerance, defined as treatment-related dose reduction or withdrawal between the agents.Results: Twenty-six patients with AVMs (n = 12) or aneurysms (n = 14) were recruited. Adverse event rates were similar to other reported trials of these agents; 4 of 13 (31%) minocycline and 3 of 13 (23%) doxycycline patients had dose-limiting intolerance (hazard ratio = 3.1, 95% CI = 0.52–18.11, log rank p = 0.70). Conclusions: It is feasible to propose a long-term trial to assess the potential benefit of tetracycline therapy to decrease hemorrhagic risk in brain vascular malformations.
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