Mequinol and Tretinoin (Topical Route)

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Side Effects

In some animal studies, mequinol and tretinoin has been shown to cause skin tumors to develop faster when the treated area is exposed to ultraviolet light (sunlight or artificial sunlight from a sunlamp). Other studies have not shown the same result and more studies need to be done. It is not known if mequinol and tretinoin topical solution causes skin tumors to develop faster in humans.

Along with its needed effects, a medicine 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 as soon as possible if any of the following side effects occur:

• Burning feeling or stinging skin (severe)
• Itching (severe)
• Peeling of skin (severe)
• Redness of skin (severe)

• Allergic reaction
• Large blisters on the skin

Some side effects 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:

• Burning feeling, stinging, or tingling of skin (mild)—lasting for a short time after first applying the medicine
• Itching (mild)
• Chapping or slight peeling of skin (mild)
• Lightening of skin around treated area
• Lightening of skin on treated area
• Redness of skin (mild)
• Skin irritation
• Unusually warm skin (mild)

• Crusting of skin
• Dry skin
• Skin rash

Other side effects not listed may also occur in some patients. If you notice any other effects, check with your healthcare professional.

Call your doctor for medical advice about side effects. You may report side effects to the FDA at 1-800-FDA-1088.

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