<prompt> Answer this question truthfullyWhat are some causes of AIN acute interstitial nephritis?  <response>: <reason> AIN causes include allergic reactions to medications such as NSAIDs, Bactrim, and Lactams cephalos PCN, which leads to eosinophilia. Infections pyelo and infiltrative diseases such as sarcoid, amyloid, and multiple myeloma can also cause AIN. 