title: Comparison of morning versus evening dosing and 24-h post-dose efficacy of travoprost compared with latanoprost in patients with open-angle glaucoma .
abstract: OBJECTIVE
  To compare the IOP-lowering efficacy of a.m.-dosed travoprost and latanoprost at 24-h post-dose.
  
  
  METHODS
  Open-angle glaucoma patients not naïve to prostaglandin therapy and currently controlled on p.m.-dosed (2100) latanoprost (n = 21) or travoprost (n = 30) had baseline IOPs measured at 0900. In a randomized, single-masked, crossover design, patients received travoprost (Travatan † ) or latanoprost (Xalatan ‡ ) at 0900 for 4 weeks, then were crossed over to receive the second prostaglandin for another 4 weeks. Treatment IOP was measured at 0900 prior to morning dose at both 4 and 8 week visits. Patient dosing preference (a.m./p.m.) was surveyed on exit.
  
  
  METHODS
  Intraocular pressure (IOP). † Travatan is a registered trade name of Alcon Laboratories, Inc., Fort Worth, TX, USA ‡ Xalatan is a registered trade name of Pfizer, New York, NY, USA.
  
  
  RESULTS
  The mean IOP in the first period when all patients were dosed in the evening was assessed 12 h after dosing at 09:00 and it was similar in the two treatment groups (mean ± standard deviation: 17.9 ± 2.7 mmHg for travoprost versus 17.7 ± 2.5 mmHg for latanoprost, p = 0.812). In the a.m.-dosing crossover comparison, the 24-h post-dose IOP was significantly lower ( p < 0.001) on travoprost (16.9 ± 3.1 mmHg) compared to latanoprost (18.6 ± 3.3 mmHg). In the exit survey, 51% of patients preferred a.m.-dosing.
  
  
  CONCLUSIONS
  a.m.-dosed travoprost is superior to a.m.-dosed latanoprost by 1.7 mmHg at 24-h post-dose.
authors.affiliation: University of Toronto, Toronto, Canada. d.yan@sympatico.ca
authors.forename: David B
authors.initials: DB
authors.lastname: Yan
authors.forename: Robert A
authors.initials: RA
authors.lastname: Battista
authors.forename: Anna-Bettina
authors.initials: AB
authors.lastname: Haidich
authors.forename: Anastasios G P
authors.initials: AG
authors.lastname: Konstas
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D000465:Algorithms; D000959:Antihypertensive Agents / Q000008:administration & dosage / Q000009:adverse effects; D002940:Circadian Rhythm / Q000187:drug effects / Q000502:physiology*; D003008:Cloprostenol / Q000008:administration & dosage / Q000009:adverse effects / Q000031:analogs & derivatives*; D018592:Cross-Over Studies; D004305:Dose-Response Relationship, Drug; D004334:Drug Administration Schedule; D005260:Female; D005902:Glaucoma, Open-Angle / Q000188:drug therapy*; D006801:Humans; D000077338:Latanoprost; D008297:Male; D008875:Middle Aged; D011461:Prostaglandins F, Synthetic / Q000008:administration & dosage* / Q000009:adverse effects; D016037:Single-Blind Method; D013997:Time Factors; D000069557:Travoprost; D016896:Treatment Outcome
chemical_list: D000959:Antihypertensive Agents; D011461:Prostaglandins F, Synthetic; D003008:Cloprostenol; D000077338:Latanoprost; D000069557:Travoprost