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Cystaran Side Effects

Generic name: cysteamine ophthalmic

Medically reviewed by Last updated on Mar 6, 2023.

Note: This document contains side effect information about cysteamine ophthalmic. Some dosage forms listed on this page may not apply to the brand name Cystaran.

Applies to cysteamine ophthalmic: ophthalmic solution.

Serious side effects of Cystaran

Along with its needed effects, cysteamine ophthalmic (the active ingredient contained in Cystaran) may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.

Check with your doctor immediately if any of the following side effects occur while taking cysteamine ophthalmic:

More common

  • Blurred vision
  • decrease or change in vision
  • eye pain, redness, itching, irritation, or swelling
  • headache
  • sensitivity of the eyes to light

Other side effects of Cystaran

Some side effects of cysteamine ophthalmic may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects.

Check with your health care professional if any of the following side effects continue or are bothersome or if you have any questions about them:

More common

  • Watering of the eyes

For Healthcare Professionals

Applies to cysteamine ophthalmic: ophthalmic solution.


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


1. Product Information. Cystaran (cysteamine ophthalmic). Sigma-Tau Pharmaceuticals. 2012.

Further information

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

Some side effects may not be reported. You may report them to the FDA.