What is a common cause of interstitial nephritis often linked with drug reactions?

• A. Acetaminophen toxicity
• B. Antibiotics
• C. Hypertension medications
• D. Diuretics

Answer: (B)

Interstitial nephritis is an inflammatory condition that affects the kidney's interstitium, which is the space between the renal tubules. A common cause of this condition is drug reactions, particularly from certain classes of medications. Among the choices provided, antibiotics are frequently implicated in drug-induced interstitial nephritis.

This reaction tends to occur as a hypersensitivity response, where the immune system reacts to the medication, leading to inflammation and damage to the renal interstitium. Some antibiotics, such as penicillin and cephalosporins, have historically been known to cause this reaction.

Acetaminophen toxicity typically leads to acute liver failure rather than interstitial nephritis. Hypertension medications can cause interstitial nephritis, but they are less commonly associated with this specific condition compared to antibiotics. Diuretics can also lead to this type of renal injury, but they are not as frequently recognized as a primary cause compared to antibiotics. Therefore, the strong association of antibiotics with interstitial nephritis in clinical practice makes them the correct answer in this case.