What is your approach to long-term suppressive therapy of valganciclovir for a patient with a history of CMV anterior uveitis?

Once I confirm a diagnosis of CMV anterior uveitis (+ PCR), I treat patients with valganciclovir 900 mg PO twice daily for 21 days and then switch to prophylactic dosing of 900 mg daily for 6 months to 1 year. That being said, many patients have recurrences even on prophylactic dosing and need, in m...