Chronic Tubulointerstitial Nephritis and Peripheral Neuropathy Probably Due to Pantoprazole Mimicking Systemic Disease.

The coexistence of peripheral neuropathy and chronic tubulointerstitial nephritis in a patient can be secondary to various diseases including-connective tissue disorders, sarcoidosis, IgG4-related disease, heavy metal poisoning, plasma cell dyscrasias, and drugs. A 70-year old woman was admitted with fatigue for 4 months and numbness of both lower limbs for 6 months. She had antral gastritis and was on treatment with pantoprazole for 1 year. On evaluation, she had peripheral neuropathy and chronic tubulointerstitial nephritis which was suspected to be secondary to pantoprazole after ruling out other causes. We present a patient with multiple complications (peripheral neuropathy and chronic tubulointerstitial nephritis) likely associated with pantoprazole which was not reported in the literature previously to the best of our knowledge.