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Many medicines can cause acute kidney injury (acute renal failure), such as: Antibiotics. These include aminoglycosides, cephalosporins, amphotericin B, bacitracin, and vancomycin. Some blood pressure medicines. One example is ACE inhibitors, such as lisinopril and ramipril. Another is angiotensin receptor blockers.
ACE inhibitors like ramipril or NSAIDs naproxen can cause sudden deterioration of kidney function. So you were changed to amlodipine & paracetamol. However the kidney count term is confusing. As you are using term paracetamol, I feel you are non US citizen. The common tests to determine kidney function are BUN, CREATINE & eGFR. You can see this link for the normal range.