Fluorouracil topical Side Effects
For the Consumer
Applies to fluorouracil topical: topical cream, topical solution
In addition to its needed effects, some unwanted effects may be caused by fluorouracil topical. In the event that any of these side effects do occur, they may require medical attention.
Major Side Effects
You should check with your doctor immediately if any of these side effects occur when taking fluorouracil topical:
- Redness and swelling of normal skin
Minor Side Effects
Some of the side effects that can occur with fluorouracil topical 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:More common:
- Burning feeling where medicine is applied
- increased sensitivity of skin to sunlight
- skin rash
- soreness or tenderness of skin
- Darkening of skin
- watery eyes
For Healthcare Professionals
Applies to fluorouracil topical: topical cream, topical kit, topical solution
Dermatologic side effects have been the most frequently reported and include local burning, crusting, allergic contact dermatitis, erosions, erythema, hyperpigmentation, irritation, pain, photosensitivity, pruritus, scarring, rash, soreness, and ulceration, and other local reactions.
The following side effects have been reported infrequently and a causal relationship is remote: alopecia, blistering, bullous pemphigoid, discomfort, ichthyosis, scaling, suppuration, swelling, telangiectasia, tenderness, urticaria, and skin rash.[Ref]
One case of life-threatening systemic toxicity was associated with fluorouracil topical 5% cream in a patient with dihydropyrimidine dehydrogenase enzyme deficiency. Signs and symptoms included severe abdominal pain, bloody diarrhea, vomiting, fever, chills, stomatitis, erythematous rash, neutropenia, thrombocytopenia, and inflammation of the esophagus, stomach and small intestine.[Ref]
Miscarriages and a birth defect (ventricular septal defect) have been reported when fluorouracil was applied to mucous membrane areas of pregnant women. A cleft lip and palate have been reported when fluorouracil was applied as recommended.[Ref]
Hematologic side effects have included leukocytosis, which has been the most frequently reported hematologic side effect. Eosinophilia, thrombocytopenia, and toxic granulation have been reported infrequently and a causal relationship is remote.[Ref]
Nervous system side effects have been reported infrequently and a causal relationship is remote. These included emotional upset, insomnia and irritability.[Ref]
Gastrointestinal side effects have been reported rarely and a causal relationship is remote. These include medicinal taste and stomatitis.[Ref]
Ocular side effects have been reported infrequently and a causal relationship is remote. These include conjunctival and corneal reactions, and lacrimation.[Ref]
Nasal irritation has been reported infrequently and a causal relationship is remote.[Ref]
Herpes simplex has been reported infrequently and a causal relationship is remote.[Ref]
1. "Product Information. Carac (fluorouracil topical)" Aventis Pharmaceuticals, Swiftwater, PA.
2. "Product Information. Efudex (fluorouracil topical)" ICN Pharmaceuticals, Costa Mesa, CA.
Not all side effects for fluorouracil topical may be reported. You should always consult a doctor or healthcare professional for medical advice. Side effects can be reported to the FDA here.
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