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The influence of bimatoprost and unoprostone isopropyl on the intraocular pressure of cats
An interesting and important question: do these eye medications have effects on the paramaters of intraocular pressure (IOP), pupillary diameter (PD), blepharospasm score, conjunctival injection score, and aqueous humor flare score on the eyes of healthy cats?

Either 0.03% bimatoprost solution is applied once daily or 0.15% unoprostone isopropyl solution is applied twice daily topically to the eyes of normal cats.

The aforementioned parameters were evaluated daily in each of 12 cats throughout the entirety of the study.
During an initial 10-day treatment phase a single eye of six of the cats was treated with 0.03% bimatoprost solution while a single eye of the remaining six cats was treated with buffered saline solution (BSS) once daily.

During a second 10-day treatment phase a single eye of six of the cats was treated with 0.15% unoprostone isopropyl solution while a single eye of the remaining six cats was treated with BSS twice daily.
Contralateral eyes of all cats remained untreated at all time points.

Results: Blepharospasm score, conjunctival injection score, and aqueous humor flare score never rose from a value of 0, for any eye of any cat during the study.
The mean ± SD of IOP for eyes treated with 0.03% bimatoprost solution and BSS were 16.55 ± 3.06 mmHg and 18.02 ± 3.52 mmHg, respectively.
The mean ± of PD for eyes treated with 0.03% bimatoprost solution and BSS were 5.7 ± 1.57 mm and 6.39 ± 1.78 mm, respectively.
The mean ± SD of IOP for eyes treated with 0.15% unoprostone isopropyl solution and BSS were 15.7 ± 2.91 mmHg and 17.2 ± 2.9 mmHg, respectively. The mean ± SD of PD for eyes treated with 0.15% unoprostone isopropyl solution and BSS were 5.8 ± 1.43 mm and 6.9 ± 1.37 mm, respectively.

There was no significant difference (P 0.05) in IOP or PD between eyes treated with 0.03% bimatoprost solution vs. eyes treated with BSS.

Similarly, there was no significant difference (P 0.05) in IOP or PD between eyes treated with 0.15% unoprostone isopropyl solution vs. eyes treated with BSS.

Conclusion: Neither once daily topical administration of 0.03% bimatoprost solution nor twice daily topical administration of 0.15% unoprostone isopropyl solution significantly affect the IOP of normal cats.
Both 0.03% bimatoprost solution and 0.15% unoprostone isopropyl solution induced no significant ocular side effects in normal cats when dosed over a 10-day treatment period.


Source: Bartoe, Joshua T., Davidson, Harriet J., Horton, Mary T., Jung, Yoonsung & Brightman, Alan H. (2005): The effects of bimatoprost and unoprostone isopropyl on the intraocular pressure of normal cats. In: Veterinary Ophthalmology 8 (4), 247-252.





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SMALL ANIMAL PRACTICE

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