. Purpose: This study aimed to compare the safety and effect on intraocular pressure (IOP) of latanoprost given every evening versus pilocarpine/timolol maleate fixed combination (PTFC) given twice daily in patients with primary open‐angle glaucoma (POAG) or ocular hypertension (OH). Methods: Following a 6‐week, medicine‐free period, qualified patients were randomized for Period 1 to either placebo administered every morning and latanoprost every evening or to PTFC administered twice daily. After 8 weeks of treatment, IOP was measured at 08.00, 10.00, 16.00 and 18.00 hours. Patients were then switched to the opposite treatment and underwent a second diurnal evaluation at the end of Period 2. Results: Thirty‐two patients completed this study. They demonstrated diurnal baseline IOP of 24.1 ± 2.4 mmHg. Mean diurnal pressure was 16.8 ± 2.1 mmHg on PTFC and 16.9 ± 2.5 mmHg on latanoprost (p = 0.60). No statistical difference between treatments was observed at any individual time‐point except at 10.00 hours, when the PTFC group demonstrated an IOP of 15.9 ± 2.3 mmHg and latanoprost 16.8 ± 2.7 mmHg (p = 0.02). There were no statistical differences between groups in unsolicited systemic or ocular adverse events (p > 0.05). However, the PTFC group showed a narrower pupil diameter (2.3 mm) than the latanoprost group (3.7 mm). Additionally, a solicited symptom survey demonstrated mild blurred vision, stinging and ocular pain with PTFC (p < 0.001). Conclusions: Both PTFC and latanoprost are efficacious in reducing diurnal IOP in POAG or OH. However, PTFC may be more effective in the late morning and may have a greater incidence of mild ocular side‐effects.
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