Table of contents

  • Brand Names
  • Drug Combinations
  • Chemistry
  • Pharmacologic Category
  • Mechanism of Action
  • Therapeutic Use
  • Contraindications
  • Warnings and Precautions
  • Adverse Reactions
  • Genes that may be involved
  • Dosage
  • Special Considerations

Brand Names

North America

USA: Cysteine.

Latin America

Argentina: Cisteína; Mexico: Fixcanat.


Japan: Ecolan, Hythiol.

Drug combinations

Cysteine: Acetyltyrosin; Alanine; Amylase; Bacitracin, Calcium Lactate; Copper; Cyanocobalamin (Vitamin B~12~); Folic Acid (Vitamin B~9~); Glutamic Acid; Glycine; Isoleucine; L-Arginine; L-Histidine; L-Leucine; L-Lysine; L-Proline; L-Tryptophan; L-Valine; Magnesium Oxide; Methionine; Neomycin, Niacinamide; Pancrelipase; Pantothenic Acid (Vitamin B~5~); Papain; Phenylalanine; Pyridoxine (Vitamin B~6~); Retinol (Vitamin A); Riboflavin (Vitamin B~2~); Serine; Soybean Oil; Taurine; Thiamine (Vitamin B~1~); Threonine; Tyrosine


Cysteine Hydrochloride: C~3~H~7~NO~2~S HCl H~2~O. Mw: 175.63. L-Cysteine hydrochloride monohydrate. CAS-7048-04-6; CAS-52-89-1 (anhydrous); CAS-52-90-4 (cysteine).

Pharmacologic Category

Nutritional Supplement. (ATC-Code: V06DD).

Mechanism of action

Cysteine is an amino acid containing sulfur and synthesized from methionine. It is a precursor of glutathione and taurine. Cysteine is an essential amino acid in infants.

Therapeutic use

Supplement to crystalline amino acid solutions.

Pregnancy and lactiation implications

Unlabeled use


Hypersensitivity to cysteine or any component of the formulation. Hepatic coma or metabolic disorders involving impaired nitrogen utilization.

Warnings and precautions

Use with caution in hepatic/renal impairment. Metabolic acidosis related to the «hydrochloride» component of cysteine has occurred in infants.



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