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Mercaptamine

Mercaptamine is an approved active ingredient.

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Chemical compound

Informational only — not medical advice. Ask a doctor or pharmacist; never change a dose on your own.

What it is used for

PROCYSBI is indicated for the treatment of nephropathic cystinosis in adults and pediatric patients 1 year of age and older. PROCYSBI is a cystine-depleting agent indicated for the treatment of nephropathic cystinosis in adults and pediatric patients 1 year of age and older.

US label

Cystagon is indicated for the treatment of proven nephropathic cystinosis.

EMA

How it works

Common side effects

The following adverse reactions are also discussed in other sections of the labeling: Ehlers-Danlos-like Syndrome Skin Rash Gastrointestinal (GI) Ulcers and Bleeding Fibrosing Colonopathy Central Nervous System Symptoms Leukopenia and/or Elevated Phosphatase Levels Benign Intracranial Hypertension Most common adverse…

US label

Who should not take it

The use of PROCYSBI is contraindicated in patients with a serious hypersensitivity reaction, including anaphylaxis, to penicillamine or cysteamine.

US label

Pregnancy and breastfeeding

There are no available data on PROCYSBI use in pregnant women to inform any drug-associated risks for birth defects or miscarriage.

Excerpts from the US prescribing label (public domain), copied without changes.

Brand names

United States

Cystadrops · Cystagon · Cystaran · Procysbi

European Union

Cystadrops · Cystagon · Procysbi

Canada

Cysklar · Cystadrops · Procysbi

Approval status

US Food and Drug Administration
prescription · since 1994
European Medicines Agency
authorised · since 1997
Health Canada
prescription · marketed
First approval anywhere
1994

Codes

ATC
A16AA04, S01XA21
RxNorm CUI
3022
ChEMBL
CHEMBL602
PubChem CID
118985556
UNII
5UX2SD1KE2
Wikidata
Q617563

Frequently asked questions

What is Mercaptamine used for?

Mercaptamine is used for: Cystinosis, Corneal deposit, and Eye disease.

What are the brand names of Mercaptamine?

Brand names of Mercaptamine include Cystadrops, Cystagon, Cystaran, Procysbi, and Cysklar.

Medicines in the same class

Sources and licences

Updated November 15, 2026