In Vitro Toxicity Evaluation of New Generic Latanost ® and Latacom ® as an Ophthalmic Formulation

To evaluate the safety of two new generic ophthalmic formulations, Latanost (latanoprost) and Latacom (latanoprost and timolol) by utilizing the three-dimensional reconstructed human cornea-like epithelium (RhCE) tissue constructs as an model in the assessment of ocular irritation. irritation test was conducted on Latanost (LTN) and Latacom (LTC) and their corresponding innovators, Xalatan (XLT) and Xalacom (XLC), respectively, by using RhCE. According to the OECD guidelines No. 492 on the testing of chemicals, the ophthalmic formulations were assessed via topical exposure of the formulations on RhCE tissue. Cell viability was measured by MTT assay. The mean cell viability percentage of LTN and XLT was 70.5 and 75.7%, respectively, whereas, for LTC and XLC, the percentage viability was 95.3 and 85.7%, respectively. The two new generic formulations (LTN and LTC) did not reduce the cell viability of the RhCE tissue to ≤60%. Thus, both can be considered as nonirritant. Both newly developed generics are nonocular irritants. This study informs the safety assessment of new generic antiglaucoma ophthalmic solutions applicable for long-term glaucoma treatment. The formulations aim to keep eye irritation to a minimum level. Ng JSC, Tan YX, Alwi NAA, Toxicity Evaluation of New Generic Latanost and Latacom as an Ophthalmic Formulation. J Curr Glaucoma Pract 2021;15(3):139-143.