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Check with your doctor as soon as possible if any of the following side effects occur: More common

Bad odor (solution only)
bleeding of treated skin
blistering, crusting, or scabbing of treated skin
bloody urine (solution only)
burning feeling of treated skin
dizziness (solution only)
headache (gel only)
itching of treated skin
pain during sexual intercourse (solution only)
pain of treated skin
problems with foreskin of penis (solution only)
redness or swelling of treated skin
scarring of treated skin (solution only)
skin ulcers of treated skin
vomiting (solution only) 

Symptoms of overdose

Nausea
vomiting
diarrhea
chills
fever
sore throat
unusual bleeding or bruising
oral ulcers

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: More common

Dryness of treated skin
peeling of treated skin
soreness or tenderness of treated skin
stinging or tingling of treated skin
trouble in sleeping (solution only)

Less common

Changes in color of treated skin (gel only)
skin rash (gel only)

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.