If you are not having any other diseases, then you should take the following steps: Dietary changes: Avoid foods causing flatulence. Medications: Two drugs, Asmebeverine (Colofac) and Alverine (Spasmonal) are available Over the counter. You should take one tab. twice daily of either of these drugs.
Gelusil is an antacid that contains a substance called simethicone. This is capable of absorbing gases from the stomach. Take 3 tsf thrice daily.