title: Impact of topical bimatoprost 0.01% and bimatoprost 0.03% on conjunctival irritation in rabbits.
abstract: BACKGROUND
  The purpose of this study was to examine and compare the conjunctival irritation (congestion, swelling, and discharge) of topical bimatoprost ophthalmic solution 0.01% and bimatoprost ophthalmic solution 0.03% in rabbits.
  
  
  METHODS
  Six healthy New Zealand White rabbits were treated with either bimatoprost 0.01% or bimatoprost 0.03% (3 animals/group). One dose (2 drops/dose) of study medication was administered to the right eye of each animal every 30 minutes for 4.5 hours. Approximately 1 hour after the last dose, conjunctival irritation was assessed using a slit-lamp biomicroscope to individually evaluate conjunctival congestion, swelling, and discharge.
  
  
  RESULTS
  The mean conjunctival congestion, swelling and discharge scores for bimatoprost 0.03% were 1.67, 0.33 and 0.33, respectively, and for bimatoprost 0.01% were 2.00, 0.33 and 1.33, respectively.
  
  
  CONCLUSIONS
  Despite the lower drug concentration of the 0.01% formulation, bimatoprost 0.01% does not reduce conjunctival irritation, including conjunctival congestion, swelling, and discharge, in rabbits compared to bimatoprost 0.03%. Further studies would be needed to determine whether the increase in the mean conjunctival congestion and discharge scores may be attributed to the increased BAK concentration in the bimatoprost 0.01% formulation.
authors.affiliation: Alcon Research, Ltd., Fort Worth, TX, USA.
authors.forename: Abayomi B
authors.initials: AB
authors.lastname: Ogundele
authors.forename: Guangming
authors.initials: G
authors.lastname: Li
authors.forename: Joel J
authors.initials: JJ
authors.lastname: Ellis