Valacyclovir inhibition of recovery of ocular herpes simplex virus type 1 after experimental reactivation by laser in situ keratomileusis

Purpose. To determine whether the systemic administration of valacyclovir ( Valtrex(R)) reduces ocular shedding of herpes simplex virus type 1 (HSV-1) after laser in situ keratomileusis (LASIK in the New Zealand White (NZW) ra bbit latency model, Setting: Department of Ophthalmology, University of Pittsburgh School of Me dicine, Pittsburgh, Pennsylvania, USA, Methods: New Zealand White rabbits latently infected with HSV-1 W strain we re divided into 3 groups. The first received 100 mg/kg/day of valacyclovir; the second, 200 mg/ kg/day of valacyclovir; and the third (control), salin e. One half the total dose of valacyclovir was delivered via intraperitonea l injections twice daily for 7 days beginning with 1 dose before LASIK The HSV-1 ocular shedding was determined from eye cultures for 7 days after LAS K Results: The administration of both 100 mg/kg/day and 200 mg/kg/day of vala cyclovir significantly reduced the number of eyes (1/16 in both groups) and the total number of HSV-1 shedding days (1/122 and 2/122, respectively) fr om which HSV-1 was recovered compared to the control group (7/16 [P =.0396] and 14/129 [P <.007], respectively), Conclusions: Systemic administration of valacyclovir significantly reduced HSV-1 ocular shedding after LASIK in the NZW rabbit latency model, The clin ical implications of this study suggest that patients with a history of rec urrent ocular herpes may be able to safely have LASIK with less risk of a r ecurrent herpetic episode while on valacyclovir antiviral prophylaxis, J Ca taract Refract Surg 2001; 27.,1288-1293 (C) 2001 ASCRS and ESCRS.