Journal of the American Academy of Dermatology • March 2020
Drolet BA, Boakye-Agyeman F, Harper B, Holland K, Lewandowski A, Stefanko N, Melloni C
Off-label ophthalmic timolol has been rapidly adopted for treatment of infantile hemangioma since topical application of β-blockers was presumed to have an improved safety profile compared with that of oral administration. We examined timolol plasma concentrations in children receiving ophthalmic preparations applied to skin hemangiomas. Timolol was detected in 86 of 92 plasma samples (93%). We predicted that young infants would have higher plasma concentrations but found that older infants (6-12 months) had the highest concentrations. Subsequently, we analyzed the effect of hemangioma size and thickness on plasma concentrations. Only hemangioma thickness significantly predicted plasma concentrations.