Over-the-counter Gastrointestinal medications can be purchased without a prescription and are most often used for the treatment that may not require the direct supervision of a physician. If, after the treatment with over-the-counter Gastrointestinal products you aren’t seeing improvement, don’t hesitate to contact your physician. It’s important to learn how over the counter Gastrointestinal products you choose to buy work and what active ingredients should you look for.