Skip to Content




ATC (Anatomical Therapeutic Chemical Classification)


CAS registry number (Chemical Abstracts Service)


Chemical Formula


Molecular Weight


Therapeutic Categories



Ophthalmic agent

Chemical Names

β-mercaptoetlyamine (WHO)

2-Aminoetanetiol (USAN)

Foreign Names

  • Mercaptaminum (Latin)
  • Mercaptamin (German)
  • Mercaptamine (French)
  • Mercaptamina (Spanish)

Generic Names

  • Cysteamine (OS: USAN)
  • Mercaptamine (OS: DCF, BAN)
  • Decarboxycysteine (IS)
  • L-1573 (IS)
  • MEA (IS)
  • Mercamine (IS)
  • NSC 647528 (IS)
  • Thioethanolamine (IS)
  • UNII-5UX2SD1KE2 (IS)
  • WR 347 (IS)
  • Cysteamine Bitartrate (OS: JAN)
  • Mercaptamine hydrogentartrate (IS)
  • Mercaptoethylamine bitartrate (IS)
  • RP103 (IS)
  • Cysteamine Hydrochloride (OS: USAN)
  • CI 9148 (IS: Parke-Davis)
  • NSC 21116 (IS)
  • UNII-IF1B771SVB (IS)

Brand Names

  • Cystagon
    Orphan Europe, Poland
  • Procysbi
    Raptor Pharmaceuticals Europe, Poland
  • Cystagon
    Alphapharm, Australia; Excelsior, Taiwan; Mylan, United States; Orphan, Germany; Orphan Europe, Austria; Orphan Europe, Belgium; Orphan Europe, Czech Republic; Orphan Europe, Spain; Orphan Europe, France; Orphan Europe, Italy; Orphan Europe, Norway; Orphan Europe Nordic, Denmark; Orphan Europe Nordic, Iceland; Orphan Europe Nordic, Sweden; Solpharm, Croatia (Hrvatska); Swedish Orphan, Lithuania
    Raptor Pharmaceuticals Europe B.V, Germany
  • Cystadrops 0.55%
    Orphan Europe, France
  • Cystagon
    Orphan Europe, Hungary
  • Cystaran
    Sigma-Tau, United States
  • Procysbi
    Raptor Pharmaceutical, United States


BANBritish Approved Name
DCFDénomination Commune Française
ISInofficial Synonym
JANJapanese Accepted Name
OSOfficial Synonym
Rec.INNRecommended International Nonproprietary Name (World Health Organization)
USANUnited States Adopted Name
WHOWorld Health Organization

Further information on drug naming conventions: International Nonproprietary Names.

Important Notice: The international database is in BETA release. This means it is still under development and may contain inaccuracies. It is not intended as a substitute for the expertise and judgement of your physician, pharmacist or other healthcare professional. It should not be construed to indicate that the use of any medication in any country is safe, appropriate or effective for you. Consult with your healthcare professional before taking any medication.

Further information

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.