SummaryFingolimod causes macular edema (ME) by acting via the S1P3 receptor agonism, thereby reducing the tight junction between the endothelial cells of the retinal capillaries. This results in the breakdown of the inner blood retinal barrier, causing ME. Ophthalmologic evaluation including optical coherence tomography is recommended at baseline and then at 3 months, 6 months, and annually thereafter in all patients on fingolimod. The risk of ME increases in patients who are diabetic, have had uveitis, or who undergo intraocular procedures such as cataract surgery, and hence these patients need close monitoring. Cessation of the drug results in resolution of the ME. However, ME can also be treated using anti-inflammatory medication (steroids) in patients who opt to remain on fingolimod.F ingolimod is the first oral disease-modifying therapy approved for the treatment of multiple sclerosis (MS). The efficacy of fingolimod has been demonstrated in 2 large, phase III, double-blind, randomized trials.1,2 Practical aspects related to the use of fingolimod and its systemic side effects have been described.
3Fingolimod was used initially as an immunomodulator to augment the immunosuppressive effect of other drugs in renal transplant rejection. The dosage for renal transplant ranged between 2.5 and 5 mg, 5 and 10 times that approved for treatment of MS. Fingolimod failed to show a benefit for the prevention of renal allograft rejection over the conventional treatment in large phase III studies and hence further development in renal transplantation was stopped. In these studies, fingolimod was associated with the development of macular edema (ME).4 As