Final answer:
Allergic interstitial nephritis is most commonly associated with sulfonamides, and treatment involves avoiding the drug and using anti-inflammatory drugs.
Step-by-step explanation:
Allergic interstitial nephritis is most commonly associated with the drug class called sulfonamides. It is important to note that there is a distinction between sulfa drugs and other sulfur-containing drugs and additives, such as sulfates and sulfites, which do not cause the same hypersensitivity reactions as sulfonamides. Treatment of allergic interstitial nephritis typically involves avoiding further exposure to the drug and using anti-inflammatory drugs to reduce inflammation.