Cysteamine Side Effects

Not all side effects for cysteamine may be reported. You should always consult a doctor or healthcare professional for medical advice. Side effects can be reported to the FDA here.

For the Consumer

Applies to cysteamine: oral capsule, oral capsule delayed release

In addition to its needed effects, some unwanted effects may be caused by cysteamine. In the event that any of these side effects do occur, they may require medical attention.

You should check with your doctor immediately if any of these side effects occur when taking cysteamine:

More common
  • Abdominal or stomach pain
  • diarrhea
  • drowsiness
  • fever
  • loss of appetite
  • nausea or vomiting
  • skin rash
Less common
  • Confusion
  • dizziness
  • headache
  • mental depression
  • sore throat
  • trembling
Rare
  • Convulsions
  • increased thirst
  • unusual tiredness or weakness
Incidence not known
  • Blistering, peeling, or loosening of the skin
  • blurred or double vision
  • bone lesions
  • bulging soft spot on head of an infant
  • change in the ability to see colors, especially blue or yellow
  • chills
  • continuing ringing or buzzing or other unexplained noise in the ears
  • cough
  • eye pain
  • hearing loss
  • itching
  • joint or muscle pain
  • loss of appetite
  • loss of vision
  • pain behind the eyes
  • pain in the legs
  • pain with eye movement
  • red skin lesions, often with a purple center
  • red, irritated eyes
  • reddish purple lines on the arms, face, legs, trunk, or groin
  • severe headache
  • sore throat
  • sores, ulcers, or white spots in the mouth or on the lips

Some of the side effects that can occur with cysteamine may not need medical attention. As your body adjusts to the medicine during treatment these side effects may go away. Your health care professional may also be able to tell you about ways to reduce or prevent some of these side effects. If any of the following side effects continue, are bothersome or if you have any questions about them, check with your health care professional:

Less common
  • Breath odor
  • constipation
  • hives or welts
  • redness of the skin
  • unusual drowsiness, dullness, tiredness, weakness, or feeling of sluggishness
  • weight loss

For Healthcare Professionals

Applies to cysteamine: oral capsule, oral delayed release capsule

General

The most frequently reported side effects included vomiting, abdominal pain/discomfort, headaches, nausea, diarrhea, anorexia/decreased appetite, breath odor, fatigue, dizziness, skin odor, and rash.

Cardiovascular

Frequency not reported: Hypertension

Dermatologic

Common (1% to 10%): Rash
Frequency not reported: Urticaria, skin odor
Postmarketing reports: Skin lesions, skin striae, skin fragility

Gastrointestinal

Very common (10% or more): Vomiting, diarrhea, anorexia, diarrhea
Frequency not reported: Gastrointestinal ulceration and bleeding, nausea, bad breath, abdominal pain, dyspepsia, constipation, gastroenteritis, duodenitis

Genitourinary

Frequency not reported: Abnormal urine odor, interstitial nephritis

Hematologic

Frequency not reported: Leukopenia, anemia

Hepatic

Frequency not reported: Elevated alkaline phosphatase, abnormal liver function

Metabolic

Frequency not reported: Dehydration

Musculoskeletal

Postmarketing reports: Molluscoid pseudotumors, joint hyperextension, leg pain, genu valgum, osteopenia, compression fracture, scoliosis

Nervous system

Very common (10% or more): Lethargy
Frequency not reported: Somnolence, encephalopathy, seizures, dizziness, headache, ataxia, confusion, tremor, hyperkinesia, decreasing hearing, jitteriness
Postmarketing reports: Benign intracranial hypertension with papilledema

Other

Very common (10% or more): Fever
Frequency not reported: Fatigue

Psychiatric

Frequency not reported: Nervousness, abnormal thinking, depression, emotional lability, hallucinations, nightmares

Renal

Frequency not reported: Renal failure

Disclaimer: Every effort has been made to ensure that the information provided is accurate, up-to-date and complete, but no guarantee is made to that effect. In addition, the drug information contained herein may be time sensitive and should not be utilized as a reference resource beyond the date hereof. This material does not endorse drugs, diagnose patients, or recommend therapy. This information is a reference resource designed as supplement to, and not a substitute for, the expertise, skill , knowledge, and judgement of healthcare practitioners in patient care. The absence of a warning for a given drug or combination thereof in no way should be construed to indicate safety, effectiveness, or appropriateness for any given patient. Drugs.com does not assume any responsibility for any aspect of healthcare administered with the aid of materials provided. The information contained herein is not intended to cover all possible uses, directions, precautions, warnings, drug interactions, allergic reactions, or adverse effects. If you have questions about the substances you are taking, check with your doctor, nurse, or pharmacist.

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