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Lysol (also called Lizol) is a brand name of disinfectant household cleaners distributed by Reckitt Benckiser. It is marketed for cleaning, disinfecting food surfaces and odor removal. The name is used on aerosol sprays, pre-saturated tissues and liquid solution. The active ingredient in many of the Lysol products is benzalkonium chloride. This ingredient is highly toxic to fish (LC50 = 280 μg ai/L), very highly toxic to aquatic invertebrates (LC50 = 5.9 μg ai/L), moderately toxic to birds (LD50 = 136 mg/kg-bw), and slightly toxic ("safe") to mammals (LD50 = 430 mg/kg-bw).
The original formulation of Lysol contained cresols. This formulation may still be available commercially in some parts of the world. Formulations containing chlorophenol are still available in the US. 
In 1911, poisoning by drinking lysol was the most common means of suicide in Australia. 
In 1918, during the Spanish flu pandemic, Lehn & Fink, Inc. advertised Lysol disinfectant as an effective countermeasure to the influenza virus. Newspaper ads provided tips for preventing the spread of the disease, including washing sick-rooms and everything that came in contact with patients with Lysol. A small (US50¢) bottle made five gallons (19 litres) of disinfectant solution, and a smaller (US25¢) bottle 2 gallons (7.5 litres). The company also advertised the "unrefined" Lysol F. & F. (Farm & Factory) for use in factories and other large buildings — a 5-gallon (19 litre) can, when diluted as directed, made 50 gallons of disinfecting solution.
In the late 1920s Lysol disinfectant began being marketed by maker Lysol, Incorporated and distributor Lehn & Fink, Inc. as a feminine hygiene product. They intimated that vaginal douching with a diluted Lysol solution prevented infections and vaginal odor, and thereby preserved youth and marital bliss. This Lysol solution was also used as a birth control agent, as post-coital douching was a popular method of preventing pregnancy at that time. The use of Lysol was later discouraged by the medical community as it tended to eliminate the bacteria normal to the healthy vagina, thus allowing more robust, health-threatening bacteria to thrive, and may have masked more serious problems that certain odors indicated in the first place. All the same, Joseph De Lee, a prominent American obstetrician who held great sway over American obstetric practice through his writings, encouraged the use of Lysol during labor. He writes in 1938, "...[J]ust before introducing the hand, the vagina is liberally flushed with 1 per cent lysol solution squeezed from pledgets of cotton, the idea being to reduce the amount of infectious matter unavoidably carried into the puerperal wounds and up into the uterus by the manipulations." 
Different Lysol products contain different active ingredients. Examples of active ingredients used in Lysol products:
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