Acyclovir (ophthalmic)

No clinically significant interactions have been identified resulting from topical administration of other drugs concomitantly with AVACLYR.

8.1 Pregnancy Risk Summary A prospective epidemiologic registry of acyclovir use from 1984 to 1999 indicated that the occurrence rate of birth defects in women exposed to systemically administered acyclovir during the first trimester of pregnancy (period of organogenesis) approximated that found in the general population. Likewise, oral and subcutaneous administration of acyclovir to pregnant mice, rats, and rabbits during organogenesis did not produce teratogenicity at clinically relevant doses (see Animal Data ) . Data Human Data A prospective epidemiologic registry of acyclovir use during pregnancy was established in 1984 and completed in April 1999.

There were 749 pregnancies followed in women exposed to systemically administered acyclovir during the first trimester of pregnancy resulting in 756 outcomes. The occurrence rate of birth defects approximates that found in the general population. However, the small size of the registry is insufficient to evaluate the risk for less common defects, or to permit reliable or definitive conclusions regarding the safety of acyclovir in pregnant women and their developing fetuses. The human maternal plasma level of acyclovir following ocular administration is unknown.

Animal Data In published animal reproduction studies, acyclovir was not maternally toxic and did not produce teratogenicity in the mouse at oral doses up to 450 mg/kg/day (1100 times the maximum recommended human ophthalmic dose [RHOD] on a mg/m 2 basis, assuming 100% absorption), or in the rat and rabbit at subcutaneous doses up to 50 mg/kg/day (approximately 250 and 500 times the RHOD, respectively) when administered throughout the period of organogenesis. Administration of acyclovir from postnatal days 3 to 21 did not produce adverse effects in neonatal rats at subcutaneous doses less than or equal to 20 mg/kg/day (100 times the RHOD).