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Generic Name: cysteamine ophthalmic (sis TEE a meen off THAL mik)
Brand Names: Cystaran
Cystaran (cysteamine) ophthalmic solution is used to treat corneal cystine crystal accumulation as a result of cystinosis. Includes Cystaran side effects, interactions and indications.
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Drug Information:
Cystaran (cysteamine) works by reducing the amount of cystine (an amino acid) in the body. Cysteamine is used in children with nephropathic cystinosis, a rare genetic condition that causes a build-up of cystine in the kidneys and other organs. Too much cystine can cause kidney failure or other medical problems. Cystaran eye drops are used to keep cystine crystals from building up in the cornea (surface of the eye). Follow all directions on your medicine label and package. Tell each of your healthcare providers about all your medical conditions, allergies, and all medicines you use. Learn more

Cystaran Side Effects

Cystaran Side Effects

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

For the Consumer

Applies to cysteamine ophthalmic: ophthalmic solution

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
  • red, sore eyes
  • sensitivity of the eyes to light

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

  • Headache

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.

Editorial References and Review

Medically reviewed by BestRx Medical Team Last updated on 1/1/2020.

Source: Drugs.com Cystaran