Toxic optic neuropathy: A rare but serious side effect of chloramphenicol and ciprofloxacin

{Figure 1} Laboratory work-up including complete blood count and red blood cell indices, inflammatory markers, folate and vitamin B12 levels, blood glucose along with HbA1c, renal and liver function tests, and thyroid profile were found normal. The clinical features of nutritional and TON are very similar. [...]nutritional causes must be excluded before a diagnosis of TON is made. [9] A complete recovery in visual acuity has been reported in half of the patients if offending drug is withdrawn timely and high dosage of vitamin B6 and B12 is administered systemically, suggesting reversible nature of the disease in initial stage.