A Case Report of Labile Blood Pressure and Hypotension Associated with Administration of Brimonidine Tartrate Ophthalmic Solution.
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Introduction
Brimonidine, an alpha-adrenergic agonist, is indicated for treatment of open-angle glaucoma. Labile blood pressure (BP) and hypotension have been observed with brimonidine use, but it is not well described or recognized among health care professionals.
Case
A 81 year old female with lightheadedness and labile BP was referred for 24hr ambulatory blood pressure monitoring (ABPM). Past medical history included labile hypertension (2022), open-angle glaucoma, GERD, hyperlipidemia, TIA, and obstructive sleep apnea. Medications included: brimonidine 0.2% 1 drop each eye every 8 hours (2022), metoprolol succinate 25mg twice daily (2024), and furosemide 20mg once daily. BP was recorded at 0, 30, 60, 90, 120, and 150 minutes after her morning and evening doses of brimonidine 0.2%, 1 drop in each eye. Mean SBP/DBP decreases (mm Hg) at 30, 60, 90, 120, and 150 minutes were: -32/-8, -42/-13, -60/-31, -54/-31, and -56/-27. BP values (90/54; morning and 92/52; evening) reached a nadir at 90-150 minutes after eye drop administration. The overall 24hr mean BP was 128/74 mm Hg. Standard deviation of 24hr SBP was greatly increased at 27 mm Hg. Maximum SBP was 181. SBP dipping during sleep was 7.4%.
Discussion
A case of pseudopheochromocytoma secondary to brimonidine with accompanying hypotension, similar to ours, has been reported. Brimonidine Tmax is 1-2 hours and its half-life is 3 hrs. This corresponds with the timing of low BP values we observed. Brimonidine product labeling notes it may lower blood pressure and advises caution when using it with antihypertensives. It is possible the combination of metoprolol and brimonidine has additive effect on blood pressure variability.
Conclusion
Ophthalmic medications can have systemic effects. Brimonidine has been associated with hypotension, hypertension, and labile blood pressure. Greater awareness of this potential adverse event may improve patient care.