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warnings
V. WARNINGS A. Contains sodium metabisulfite, a sulfite that may cause allergic-type reactions (e.g. hives, itching, wheezing, anaphylaxis, severe asthma attack) in certain susceptible persons. The overall prevalence of sulfite sensitivity in the general population is unknown and probably low. Sulfite sensitivity is seen more frequently in asthmatic than in nonasthmatic people. B. May produce exogenous ochronosis, a gradual blue-black darkening of the skin, the occurrence of which should prompt discontinuation of treatment. C. Sunscreen use is an essential aspect of hydroquinone therapy because minimal sunlight sustains melanocytic activity. The sunscreen agents in Glytone SunVanish provide sun protection during skin lightening therapy. During the day, supplement therapy by using an effective broad spectrum sunscreen and avoiding unnecessary sun exposure, or wear sun-protective clothing to cover treated areas in order to prevent repigmentation from occurring.
VII. ADVERSE REACTIONS No systemic adverse reactions to hydroquinone have been reported. Occasional hypersensitivity (localized contact dermatitis) may occur in which case the medication should be discontinued and the physician notified immediately. Sensitivity to sodium metabisulfite is a potential. See WARNINGS.