As of 2015, there have been no reports of Gas-X producing side effects, although patients should inform their doctors if they notice any unpleasant symptoms after taking it, according to WebMD. On rare occasions, an allergic reaction to Gas-X produces symptoms such as swelling, itching, difficulty breathing and dizziness.
Gas-X is taken to address unpleasant symptoms associated with gas, such as stomach discomfort, flatulence, burping and bloating, states WebMD. Its main ingredient is simethicone, which works by bursting gas bubbles in the gastrointestinal tract so that the body can handle the gas in a more natural manner. The fact that simethicone is not absorbed into the bloodstream contributes to the product's safety, according to the Gas-X website. Although it is a largely safe drug, women who are pregnant or nursing should consult with their doctors before taking Gas-X, as is the case with any other medication.
Gas-X provides relief from gas-related symptoms within a few minutes for most people, although it can take longer for some people to experience relief due to differences in biochemistry, notes the Gas-X website. The medication is available in three forms: chewable tablets, dissolvable strips and softgels. The directions for taking the drug vary depending on the form and are available on the product package as well as the company's website.