title: Comparison of the efficacy of betaxolol-brinzolamide and timolol-dorzolamide as suppressors of aqueous humor flow in human subjects.
abstract: OBJECTIVE
  To compare the efficacy of combinations of betaxolol-brinzolamide and timolol-dorzolamide as suppressors of aqueous humor flow and ocular hypotensive agents.
  
  
  METHODS
  Placebo-controlled, masked comparison of the two drug combinations.
  
  
  METHODS
  Twenty-five normal human volunteers with the fellow eye serving as control. METHODS OR TESTING: Fluorophotometric measurement of aqueous humor flow and pneumatonometric measurement of intraocular pressure.
  
  
  METHODS
  Aqueous humor flow and intraocular pressure.
  
  
  RESULTS
  The betaxolol-brinzolamide combination lowered aqueous flow 39% to 44%, and the timololdorzolamide combination lowered aqueous flow 51%. The betaxolol-brinzolamide combination lowered intraocular pressure 14% to 19%, and the timolol-dorzolamide combination lowered it 18% to 24%.
  
  
  CONCLUSIONS
  Both drug combinations were effective; the timolol-dorzolamide combination appeared to be the more effective of the two after short-term exposure (24 hours).
authors.affiliation: Department of Ophthalmology, Mayo Clinic and Mayo Foundation, Rochester, Minnesota 55905, USA.
authors.forename: R F
authors.initials: RF
authors.lastname: Brubaker
authors.forename: C J
authors.initials: CJ
authors.lastname: Ingram
authors.forename: E O
authors.initials: EO
authors.lastname: Schoff
authors.forename: C B
authors.initials: CB
authors.lastname: Nau
mesh_terms: D000319:Adrenergic beta-Antagonists / Q000008:administration & dosage / Q000494:pharmacology*; D000328:Adult; D000368:Aged; D001082:Aqueous Humor / Q000187:drug effects*; D015784:Betaxolol / Q000008:administration & dosage / Q000494:pharmacology*; D002257:Carbonic Anhydrase Inhibitors / Q000008:administration & dosage / Q000494:pharmacology*; D004359:Drug Therapy, Combination; D005260:Female; D015590:Fluorophotometry; D006801:Humans; D007429:Intraocular Pressure / Q000187:drug effects; D008297:Male; D008875:Middle Aged; D009883:Ophthalmic Solutions / Q000008:administration & dosage / Q000494:pharmacology; D012449:Safety; D013449:Sulfonamides / Q000008:administration & dosage / Q000494:pharmacology*; D013843:Thiazines / Q000008:administration & dosage / Q000494:pharmacology*; D013876:Thiophenes / Q000008:administration & dosage / Q000494:pharmacology*; D013999:Timolol / Q000008:administration & dosage / Q000494:pharmacology*; D014065:Tonometry, Ocular
chemical_list: D000319:Adrenergic beta-Antagonists; D002257:Carbonic Anhydrase Inhibitors; D009883:Ophthalmic Solutions; D013449:Sulfonamides; D013843:Thiazines; D013876:Thiophenes; D013999:Timolol; C111827:brinzolamide; C062765:dorzolamide; D015784:Betaxolol