Hydroquinone Information
Hydroquinone ()
Hydroquinone () Description
Each gram of Hydroquinone () USP, 4% Skin Bleaching Cream contains 40 mg Hydroquinone () USP, in a vanishing cream base of glyceryl monostearate, mineral oil, PEG-25 propylene glycol stearate, polyoxyl 40 stearate, propylene glycol, propylparaben, purified water, sodium metabisulfite, squalane and stearic acid. Chemically, Hydroquinone () is CHO and has a molecular weight of 110.11. The chemical name is 1,4 dihydroxybenzene, and the structural formula of Hydroquinone () is:
Hydroquinone () Clinical Pharmacology
Topical application of Hydroquinone () produces a reversible depigmentation of the skin by inhibition of the enzymatic oxidation of tyrosine to 3,4-dihydroxyphenylalanine (dopa) (Denton, C. et al., 1952) and suppression of other melanocyte metabolic processes (Jimbow, K. et al., 1974). Exposure to sunlight or ultraviolet light will cause repigmentation of bleached areas (Parrish, J.A. et al., 1978).
Hydroquinone () Indications And Usage
Hydroquinone () USP, 4% Skin Bleaching Cream is indicated for the gradual bleaching of hyperpigmented skin conditions such as chloasma, melasma, freckles, senile lentigines, and other unwanted areas of melanin hyperpigmentation.
Hydroquinone () Contraindications
Prior history of sensitivity or allergic reaction to Hydroquinone () or to any of the ingredients of the product. The safety of topical Hydroquinone () use during pregnancy or for children (12 years and under) has not been established.
Hydroquinone () Warnings
Contains sodium metabisulfite, a sulfite that may cause allergic-type reactions including anaphylactic symptoms and life-threatening or less severe asthmatic episodes in certain susceptible people. 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 non-asthmatic people.
Since this product contains no sunscreen, an effective broad spectrum sun blocking agent should be used and unnecessary solar exposure avoided, or protective clothing should be worn to cover bleached skin in order to prevent repigmentation from occurring.
Hydroquinone () may produce exogenous ochronosis, a gradual blue-black darkening of the skin. If this condition occurs, discontinue treatment and consult your physician. The majority of patients developing this condition are Black, but it may also occur in Caucasians and Hispanics.
Hydroquinone () Precautions
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Test for skin sensitivity before using by applying a small amount to an unbroken patch of skin; check within 24 hours. Minor redness is not a contraindication, but where there is itching or vesicle formation or excessive inflammatory response further treatment is not advised. Close patient supervision is recommended.
Hydroquinone () is a skin bleaching agent which may produce unwanted cosmetic effects if not used as directed. The physician should be familiar with the contents of this insert before prescribing or dispensing this medication.
Sunscreen use is an essential aspect of Hydroquinone () therapy because even minimal sunlight sustains melanocytic activity. To prevent repigmentation, during treatment and maintenance therapy, sun exposure on treated skin should be avoided by application of a broad spectrum sunscreen (SPF 15 or greater) or by use of protective clothing.
Avoid contact with eyes and mucous membranes.
Keep this and all medications out of reach of children. In case of accidental ingestion, call a physician or a poison control center immediately.
Studies of Hydroquinone () in animals have demonstrated some evidence of carcinogenicity. The carcinogenic potential of Hydroquinone () in humans is unknown.
Published studies have demonstrated that Hydroquinone () is a mutagen and a clastogen. Treatment with Hydroquinone () has resulted in positive findings for genetic toxicity in the Ames assay in bacterial strains sensitive to oxidizing mutagens, in studies in mammalian cells, and in the mouse micronucleus assay.
Hydroquinone () Adverse Reactions
The following adverse reactions have been reported: dryness and fissuring of paranasal and infraorbital areas, erythema, and stinging. Occasional hypersensitivity (localized contact dermatitis) may develop. If this occurs, the medication should be discontinued and the physician notified immediately.
Hydroquinone () Overdosage
There have been no systemic reactions reported from the use of topical Hydroquinone () . However, treatment should be limited to relatively small areas of the body at one time, since some patients experience a transient skin reddening and a mild burning sensation which does not preclude treatment.
Hydroquinone () Dosage And Administration
Hydroquinone () USP, 4% Skin Bleaching Cream should be applied to affected areas and rubbed in well twice daily, in the morning and before bedtime, or as directed by a physician. If no improvement is seen after 2 months of treatment, use of this product should be discontinued. There is no recommended dosage for pediatric patients under 12 years of age except under the advice and supervision of a physician.
Hydroquinone () How Supplied
Hydroquinone () USP, 4% Skin Bleaching Cream is available as follows:
1 oz (28.35 g) tube (NDC 45802--64)
Hydroquinone ()
Hydroquinone ()
Hydroquinone () Principal Display Panel - Oz Carton
Rx Only
Hydroquinone () USP, 4%
Skin Bleaching Cream
Hydroquinone () Principal Display Panel - Oz Tube
Rx Only
Hydroquinone () USP, 4%
Skin Bleaching Cream
