Purpose: To determine if adequate intraocular levels of methotrexate are achieved after intravenous administration.
Methods: After intravenous administration, methotrexate levels were determined in the serum, the anterior chamber, and the cerebrospinal fluids of a patient with recurrent ocular lymphoma. A fluorescence polarization immunoassay was used to make the determinations.
Results: At seven hours into a 24-hour intravenous infusion, methotrexate was at cytotoxic level in all samples. At 74 hours, cytotoxic levels were present only in the aqueous humor.
Conclusion: Sustained cytotoxic ocular methotrexate levels are achievable after systemic administration.