SHEET /m/acetylcysteine · PubChem CID 12035 · CAS 616-91-1 · REV 2026.07
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Acetylcysteine
from sourceC5H9NO3S · 163.2 g/mol
N-acetyl-L-cysteine · NAC · mercapturic acid · Acetadote
What is Acetylcysteine?
A modified form of the amino acid cysteine, sold as a mucus thinner and used in hospitals as the antidote for paracetamol overdose. from source
CategoryOTC medicine
Fig. 1 · 2D structure RDKit
SMILES
CC(=O)N[C@@H](CS)C(=O)OWhere you'll find it
Sold over the counter, without a prescription. See the rest of the otc medicine group.
Relative acute toxicity from source
Animal study data · LD50
- Reported LD50
- 3,000 mg/kg · very low toxicity
- Species
- rat
- Route
- oral
An LD50 describes acute toxicity under experimental conditions and is not a safe or dangerous dose for a person.
Toxicity & hazards
Toxicity · LD50
3,000 mg/kg · very low toxicity · LD50 rat oral from source
4 more reported values
- 1,000 mg/kgLD50 · oral · dog
- 3,000 mg/kgLD50 · oral · mouse
- 6,000 mg/kgLD50 · oral · rat
- 700 mg/kgLD50 · other · dog
WarningIrritantH319from source
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