Most frequent complaints reported(multiple complaints per patient are possible)

Adverse effect may be due to disease and/or other underlying condition and medication/treatment may not be causative factor

DRUG RATING DETAILS (RANK BASED ON RATINGS OF SIMILAR DRUGS; SEE TABLE AT BOTTOM)

Drug Brand Name	Obagi C Rx System C Clarifying Serum
Drug Substance/Generic Name	hydroquinone
Number of Patients Complaining	1,432,380
Serious Reactions to Substance	1,079,950
Non Serious Reactions to Substance	440,583
Substance Not Effective Complaints	81,094
At-Ray Ratio (NSR/SR); Safety indicator, higher is safer	0.41
PP Ratio (Patients Complaining/Not Effective), higher is more effective	17.66
Drug Rating = PP Ratio* At-Ray Ratio	6.80

Summary (from Wikipedia)

Hydroquinone, also benzene-1,4-diol or quinol, is an aromatic organic compound that is a type of phenol, a derivative of benzene, having the chemical formula C6H4(OH)2. It has two hydroxyl groups bonded to a benzene ring in a para position. It is a white granular solid. Substituted derivatives of this parent compound are also referred to as hydroquinones. The name hydroquinone was coined by Friedrich Wöhler in 1843.

Indications and Usage (from FDA label)

INDICATIONS AND USAGE The gradual bleaching of hyperpigmented skin conditions such as chloasma, melasma, freckles, senile lentigines, and other unwanted areas of melanin hyperpigmentation.

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Other dermatologicals

(42) Similar Drugs to Obagi C Rx System C Clarifying Serum ; Comparison Table Below
(Best drugs have high rating/ranking,high safety ratio and high effectivity ratio)

Brand Name (Click for details)	Active Ingredient	Drug ATC Class	Price Found (US $)	OVERALL Drug Rating