Eye damage, cataracts, skin aging and skin cancer are risks of this medication and UVA therapy. Protect eyes by using goggles during UVA therapy. Notify your doctor if you develop any of the following: stomach upset, nausea, headache, dizziness, nervousness, sleeplessness, rash, mouth sores, fever blisters, fluid retention, leg cramps. This medication causes changes in skin color that appear after a few weeks and up to 9 months. If you notice other effects not listed above, contact your doctor or pharmacist.