Abstract:
BACKGROUND:Oral propranolol, a nonselective β-blocker, is able to reduce the progression of retinopathy of prematurity in newborns, but it appeared unsafe. This study aimed to find, in rabbits, a propranolol eye drop concentration able to induce lower plasma but higher retinal concentrations than those obtained after oral administration. METHODS:Male New Zealand white rabbits were treated with oral propranolol (0.25 mg/kg/6 h) for 5 d, and propranolol concentrations were measured after 1, 2, 3, and 6 h in plasma, aqueous humor, vitreous humor, and retina. These concentrations were compared with those obtained after the administration of one drop of 25 μl of propranolol 0.1% prepared in saline, applied every 6 h to both eyes for 5 d. A Draize eye test and histological analyses were performed to assess eye drop tolerability. RESULTS:The administration of eye drops produced retinal concentrations similar to, but plasma concentrations significantly lower than, those measured after oral administration. The local tolerability profile was excellent. CONCLUSION:Propranolol eye drops are able to ensure high retinal and low plasma concentrations of propranolol, and this finding opens the perspective of possible topical treatment with propranolol in newborns with retinopathy of prematurity.
journal_name
Pediatr Resjournal_title
Pediatric researchauthors
Padrini L,Isacchi B,Bilia AR,Pini A,Lanzi C,Masini E,Della Bona ML,Calvani AM,Ceccantini R,la Marca G,Filippi Ldoi
10.1038/pr.2014.108subject
Has Abstractpub_date
2014-10-01 00:00:00pages
378-85issue
4eissn
0031-3998issn
1530-0447pii
pr2014108journal_volume
76pub_type
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journal_title:Pediatric research
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