Gantanol may cause dizziness, headache, lethargy, diarrhea, anorexia, nausea, vomiting, and rash. Gantanol should be stopped at the first appearance of a skin rash since the rash may become severe. Serious rashes include Stevens-Johnson syndrome (aching joints and muscles; redness, blistering, and peeling of the skin); toxic epidermal necrolysis (difficulty in swallowing; peeling, redness, loosening, and blistering of the skin).Gantanol therapy also can cause extensive sunburn, following exposure to sunlight. Patients receiving Gantanol should avoid excessive exposure to sunlight and should wear sunscreen.Gantanol may form crystals in the urine which may damage the kidney and cause bleeding into the urine. It is important to drink additional liquids during sulfonamide therapy to prevent these side effects.
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