Purpose: To determine if adherence and convenience of once-daily glaucoma medication is greater in the morning or the evening.
Design: Prospective, randomized crossover treatment trial.
Patients and Methods: Thirty patients newly diagnosed with glaucoma or ocular hypertension requiring intraocular pressure (IOP) reduction were started on travoprost eye drops and randomized to either morning or evening administration for 1 month. They were then crossed over to the opposite dosing schedule for the following month. Adherence was monitored using an automated dosing aid.
Main Outcome Measures: Adherence was compared between morning versus evening dosing and first versus second month dosing. Demographic characteristics were obtained, treatment effect was measured, and patients completed a post-study questionnaire regarding the convenience of the 2 dosing regimens.
Results: Patient adherence overall was good (89.3%). There was no statistically significant difference (P=0.07) in adherence between morning dosing (90.9%) and evening dosing (87.3%). Adherence in the first month (91.7%) was superior to the second month (86.5%). There was no significant difference in IOP response between morning and evening dosing. Patients found morning dosing more convenient than evening dosing.
Conclusions: Early adherence to treatment with a prostaglandin analogue is good, but patients prefer morning administration to evening administration. This may lead to greater adherence with morning administration, particularly among men. Adherence decreases from the first to second month after initiation of treatment. IOP response to this treatment is not significantly affected by morning versus evening administration.
Department of Surgery, Division of Ophthalmology, University of Calgary, Calgary, Alberta, Canada
Financial support provided by the Canadian Glaucoma Clinical Research Council. Dosing aids provided courtesy of Alcon Canada. The funding organizations had no role in the design or conduct of this research.
Disclosure: B.A.F. has received consultant fees, paid advisory boards, or fees for attending a meeting from Allergan, Alcon, Merck Frosst, Pfizer, and Bausch & Lomb. A.C.C. has received consultant fees, paid advisory boards, fees for attending a meeting, lecture fees, travel fees or reimbursements when speaking at the invitation of a commercial entity from Allergan, Alcon, Pfizer, and Merck. The other authors declare no conflict of interest.
Reprints: Bryce A. Ford, MD, #102, 49 Richard Way SW, Calgary, Alberta Canada T3E 7M8 (e-mail: firstname.lastname@example.org).
Received February 18, 2010
Accepted July 18, 2011