It is very important that your doctor check your progress at regular visits to make sure that this medicine is working properly. Blood tests may be needed to check for unwanted effects.
This medicine may increase your risk of having cutaneous squamous cell carcinoma (cuSCC). This is more likely to occur if you are more than 65 years of age, have too much sun exposure, or a history of skin cancer. Your doctor may want your skin to be tested and checked for any new skin lesions before treatment and every 2 months while you are using this medicine.
This medicine may cause serious types of allergic reactions, including anaphylaxis. Anaphylaxis can be life-threatening and requires immediate medical attention. Stop using this medicine and call your doctor right away if you have a rash; itching; hoarseness; lightheadedness or dizziness; trouble breathing; trouble swallowing; or any swelling of your hands, face, or mouth while you are using this medicine.
Serious skin reactions can occur with this medicine. Stop using this medicine and check with your doctor right away if you have blistering, peeling, or loosening of the skin; red skin lesions; severe acne or skin rash; sores or ulcers on the skin; or fever or chills while you are using this medicine.
Using this medicine while you are pregnant can harm your unborn baby. Use an effective form of birth control to keep from getting pregnant. If you think you have become pregnant while using the medicine, tell your doctor right away.
This medicine can cause changes in heart rhythms, such as a condition called QT prolongation. It may change the way your heart beats and cause fainting or serious side effects in some patients. Contact your doctor right away if you have any symptoms of heart rhythm problems, such as fast, pounding, or uneven heartbeats.
Make sure any doctor or dentist who treats you knows that you are using this medicine. This medicine may affect the results of certain medical tests (e.g., liver enzymes and bilirubin).
This medicine may make your skin more sensitive to sunlight. Avoid overexposing your skin to sunlight. Use sunscreen or sunblock lotions and lip balms with a sun protection factor (SPF) of at least 30 on a regular basis when you are outdoors. Wear protective clothing and hats and stay out of direct sunlight, especially between the hours of 10 AM and 3 PM. Avoid sunlamps and tanning beds.
Check with your doctor right away if blurred vision, difficulty with reading, eye pain, or any other change in vision occurs while you are receiving this medicine. Your doctor may want you to have your eyes checked by an ophthalmologist (eye doctor).
Do not take other medicines unless they have been discussed with your doctor. This includes prescription or nonprescription (over-the-counter [OTC]) medicines and herbal or vitamin supplements.