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Prescribing Information


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To contact Leadiant Biosciences, Inc. for more information, reimbursement assistance, or to report an adverse event, please use the contact information below.

Leadiant Biosciences Headquarters:

Leadiant Biosciences, Inc.
9841 Washingtonian Blvd. Suite 500
Gaithersburg, MD 20878

Phone: 1-800-447-0169
Fax: 1-301-948-1862

CYSTARAN Hotline: 1‑877‑534‑9627

Medical Information:

Phone: 1-866-634-2765

Drug Safety:

To report an adverse event, call 1-888-393-4584.

You are encouraged to report adverse events to the FDA.

Visit, or call 1‑800‑FDA‑1088.


CYSTARAN is a cystine-depleting agent indicated for the treatment of corneal cystine crystal accumulation in patients with cystinosis.

Important Safety Information:

The most frequently reported ocular adverse reactions occurring in ≥10% of patients were sensitivity to light, redness, eye pain/irritation, headache, and visual field defects.