Duration of IOP reduction with travoprost BAK-free solution

J Glaucoma. Apr-May 2008;17(3):217-22. doi: 10.1097/IJG.0b013e31815a3472.


Purpose: To compare the duration of action of travoprost ophthalmic solution 0.004% (Travatan Z) formulated without benzalkonium chloride (BAK) to travoprost ophthalmic solution 0.004% formulated with BAK (Travatan).

Methods: This was a prospective, randomized, double-masked study. Patients with open-angle glaucoma or ocular hypertension were randomized to receive 2 weeks of once-daily therapy with travoprost BAK-free or travoprost with BAK. Patients received the last dose of medication on day 13 and then intraocular pressure (IOP) was assessed every 12 hours for 60 hours. Statistical analysis included change in IOP from baseline for each group and comparison of mean IOP between groups.

Results: Of the 109 patients enrolled, 106 patients completed the study. Untreated mean baseline IOP at 8 AM was 26.9 mm Hg in the travoprost BAK-free group and 27.1 mm Hg in the travoprost with BAK group. At 12, 24, 36, 48, and 60 hours after the last dose, mean IOP in the travoprost BAK-free group was 18.7, 17.2, 19.5, 18.7, and 20.8 mm Hg, respectively; whereas mean IOP in the travoprost with BAK group was 18.5, 16.8, 19.7, 18.0, and 20.8 mm Hg, respectively. Mean IOP at all time points after the last dose of medication was >6 mm Hg lower than the 8 AM baseline in both groups. Between-group differences were within +/-0.6 mm Hg at all postdose time points. There were no statistically significant differences between the 2 treatment groups at baseline or at any postdose time point. Drug-related side effects were uncommon, mild in intensity, and comparable between groups.

Conclusions: Travoprost without BAK has similar IOP-lowering efficacy and safety compared with travoprost preserved with BAK. Both formulations of travoprost have a prolonged duration of action, with statistically and clinically significant reductions from baseline persisting up to 60 hours after the last dose.

Publication types

  • Comparative Study
  • Multicenter Study
  • Randomized Controlled Trial
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Aged
  • Aged, 80 and over
  • Antihypertensive Agents / administration & dosage*
  • Antihypertensive Agents / adverse effects
  • Benzalkonium Compounds / administration & dosage*
  • Benzalkonium Compounds / adverse effects
  • Cloprostenol / administration & dosage
  • Cloprostenol / adverse effects
  • Cloprostenol / analogs & derivatives*
  • Double-Blind Method
  • Female
  • Glaucoma, Open-Angle / drug therapy*
  • Humans
  • Intraocular Pressure / drug effects*
  • Male
  • Ocular Hypertension / drug therapy
  • Ophthalmic Solutions / administration & dosage
  • Ophthalmic Solutions / adverse effects
  • Preservatives, Pharmaceutical / administration & dosage*
  • Preservatives, Pharmaceutical / adverse effects
  • Prospective Studies
  • Time Factors
  • Tonometry, Ocular
  • Travoprost


  • Antihypertensive Agents
  • Benzalkonium Compounds
  • Ophthalmic Solutions
  • Preservatives, Pharmaceutical
  • Cloprostenol
  • Travoprost