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Definition of Acetylcysteine
Medically reviewed by Min Clinic Staff | Updated: January 2026
Acetylcysteine: An antioxidant drug used to reduce the thickness of mucus and ease its removal. It is also used to reverse the toxicity of high doses of acetaminophen. Acetylcysteine with hydration significantly reduces the risk of contrast nephropathy in patients with chronic renal insufficiency. Also called N-acetyl-L-cysteine.