Effects of topical administration of latanoprost, timolol, or a combination of latanoprost and timolol on intraocular pressure, pupil size, and heart rate in clinically normal dogs.
OBJECTIVE
To determine effects after topical administration of latanoprost, timolol, or a commercially available latanoprosttimolol combination twice daily on intraocular pressure (IOP), pupil size (PS), and heart rate (HR) in clinically normal dogs.


METHODS
17 clinically normal dogs.


METHODS
A randomized controlled clinical trial was performed with a treatment (n=9) and saline (0.9% NaCl) solution group (8). Each dog in the treatment group received 3 treatments (latanoprost, timolol, and the latanoprost-timolol combination), with a 14-day washout period between treatments. Baseline values were established on day 1 of each treatment period. On days 2 through 5, drugs were administered topically every 12 hours to 1 eye of each dog in the treatment group. In both groups, IOP PS, and HR were measured at 0, 2, 4, 6, 8, and 9 hours on days 2 and 5.


RESULTS
Eyes treated with latanoprost or the latanoprost-timolol combination had a significant decrease in IOP and a significantly smaller PS, compared with results for dogs receiving only timolol or dogs in the saline solution group. Timolol and the latanoprost-timolol combination both significantly lowered HR, compared with HR following administration of latanoprost and the saline solution.


CONCLUSIONS
Topical administration of latanoprost alone was as effective at lowering IOP as was administration of the latanoprost-timolol combination when both were given every 12 hours to clinically normal dogs. Timolol, either alone or in combination with latanoprost, appeared to have little or no effect on IOP in clinically normal dogs but was associated with a reduction in HR.
Smith
Lynsey N
LN
Eye Care for Animals, 17395 Tomball Pkwy, Ste 3-H, Houston, TX 77064, USA. lsmith@eyecareforanimals.com
Miller
Paul E
PE
Felchle
Lisa M
LM
D000287:Administration, Topical; D000818:Animals; D000959:Antihypertensive Agents / Q000008:administration & dosage / Q000494:pharmacology* / Q000627:therapeutic use; D004283:Dog Diseases / Q000188:drug therapy; D004285:Dogs / Q000502:physiology*; D004359:Drug Therapy, Combination; D005901:Glaucoma / Q000188:drug therapy / Q000662:veterinary; D006339:Heart Rate / Q000187:drug effects; D007429:Intraocular Pressure / Q000187:drug effects / Q000502:physiology*; D000077338:Latanoprost; D011461:Prostaglandins F, Synthetic / Q000008:administration & dosage / Q000494:pharmacology* / Q000627:therapeutic use; D012016:Reference Values; D013045:Species Specificity; D013666:Tears / Q000502:physiology; D013999:Timolol / Q000008:administration & dosage / Q000494:pharmacology*
D000959:Antihypertensive Agents; D011461:Prostaglandins F, Synthetic; D000077338:Latanoprost; D013999:Timolol