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Gas-X® relieves multiple gas symptoms, like pressure, bloating and possibly belching or
burping So the users can relax, refocus, and get back on track. Gas-X contains
Simethicone which is a doctor recommended ingredient to treat gas, and it's available
without a prescription. Gas-X comes in three dosage forms for users to take: softgel,
chewable, and the new Thin Strips® form.
What is the function of simethicone in Gas-X?
Simethicone is an anti-foaming agent. Simethicone is described in the NATIONAL
FORMULARY, 14th Edition, American Pharmaceutical Association, Washington, D.C.,
1975, at page 648, as a mixture of not less than 93% and not more than 99% of
dimethylpolysiloxane and not less than 4% and not more than 4.5% of silicon dioxide.
Other characteristics of simethicone are described in the aforementioned publication at
the page indicated, and that description is incorporated herein by reference. 
Dimethylpolysiloxane is sometimes referred to as polysiloxane or organopolysiloxane.
Related mixtures can also be used, e.g., another mixture of polydimethylsiloxane and a
high surface area silica. 
In colonoscopy examination, luminal visibility is frequently limited due to intraluminal
bubbles. A study shows that taking simethicone after an oral polyethylene glycol or sodium
phosphate preparation can improve colonic visibility by diminishing colonic bubbles. 
 US Patent Application Publication No. 20060193845
 Park JJ, Lee SK, Jang JY, Kim HJ, Kim NH. The effectiveness of simethicone in
improving visibility during colonoscopy. Hepatogastroenterology. 2009