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Generic name: cysteamine ophthalmic [sis-TEE-a-meen-off-THAL-mik]
Names of brands: Cystadrops, Cystaran
Classification of drugs: Miscellaneous ophthalmic agents

What are Cystadrops?

Cysteamine functions by reducing the quantity of cystine (an amino acid) within the body. Cysteamine is prescribed to people who suffer from cystinosis (SIS-tin-OH-sis). It is an uncommon genetic disorder that causes the accumulation of cystine in the kidneys and in other organs, including the eyes.

Cystadrops (for the eyes) are used to stop cystine crystals from forming on the cornea (surface of the eye). Cystadrops are also utilized for reasons not mentioned in this guideline for medication.

Side effects of Cystadrops:

Contact a medical professional immediately. Get medical attention immediately if you notice symptoms that indicate an allergic reaction, such as symptoms of hives, difficulty breathing, or swelling of your lips, face, and tongue.

Cystadrops may cause serious side effects. Consult your physician right away. If you suffer from:

  • An increase in pressure within the skull, causing severe headaches, ringing in the ears, dizziness, nausea, eye problems, and eye pain.

Common negative effects of cystadrops include:

  • Eye discomfort, redness, itching, or irritation
  • Issues with vision;
  • Headache or
  • Increased the sensitivity to the light.

This is not a comprehensive list of all side effects. Other effects may also be present. Consult your physician to seek medical advice on adverse effects. You may report any adverse reactions to the FDA at 1-800-FDA-1088.


Follow the directions on your prescription label and the package. Be sure to inform your health care providers about your allergies, medical conditions, and any other medications you take.

Prior to use this drug

Cysteamine is not a drug that is approved for use by any person younger than 18 years old.

How to take Cystadrops?

Follow the directions on the label of your prescription and also read all medication guides or instructions sheets. Make sure you use the medicine precisely as directed. Do not consume by mouth. Cystadrops are only to be used for the eyes.

Cystaran Cystaran is generally used once every hour while you're awake. Cystadrops can be applied up to four times a day. Follow the instructions of your physician for dosage with care. Do not use them when using soft contacts. Preservatives in Cystadrops may permanently stain the lenses. Make sure to use the medication for at least 15 minutes prior to inserting your contact lenses. Wash your hands after applying eye drops.

To apply the drops to your eyes To apply the eye drops, tilt your head slightly, then pull down your lower eyelids to create an eyelid pocket. Then, hold the dropper in front of the eye drop into this pocket. Keep your eyes closed for one or two minutes. Only use the amount of drops that your doctor has recommended.

Don't touch the tip of the dropper for your eyes, or put the dropper directly onto your eyes. A dropper that is contaminated could cause an eye infection, which could result in severe vision issues.

Storing Cystadrops:

  • Make sure to keep the bottle in its original carton.
  • Keep Cystaran in the freezer until you are ready to begin using it. It should be thawed for 24 hours prior to your first use. Then, place the bottle tightly in the refrigerator or at ambient temperature. Don't refreeze the bottle after the thawing.
  • Storage cylinders in the refrigerator. After opening the bottle for the first time and storing it in a fridge or at room temperature, it should be tightly sealed and shielded from light. Don't refrigerate the bottle immediately after opening it.

The bottle should be disposed of after one week of use, regardless of whether there is medicine in it. If you are using Cystaran, take a fresh container from your freezer within the time frame of 24 hours to thaw so that you don't skip the dose.

What happens if I miss the dose?

Take the medication whenever you remember, and then you can return to your normal routine. Avoid taking two doses at the same time.

What happens if I overdose?

An overdose of the drug is not likely to be a danger. You should seek medical attention in an emergency or contact the Poison Help Line at 1-800-222-1222 in the event that someone has swallowed the medicine accidentally.

What should be avoided?

The dosage you require may be altered if you change the type or strength of Cystadrops. Be sure to use only the dosage and form the doctor recommends.

Interaction with other drugs

Eye medicine will not be affected by any other medications that you are taking. However, there are many drugs that interact. Be sure to inform your health care providers about the medications you take, including medications that are prescribed and available over the counter, vitamins, and herbs.