ENO Regular that's ayurvedic proprietary medicine (Especially for Relieving Acidity). The acidity reliever powder is soft and gentle on your stomach and can do its magic in 6 seconds. Eno regulator has a fruit salt regulator which helps you feel better and relieves acidity. Eno is India's No. 1 Antacid Brand. Eno Regular Antacid Sachet is used for the symptomatic relief of acidity, heartburn, acid indigestion, sour stomach, and an upset stomach. Eno Regular Antacid provides fast relief from acidity & gets to work in 6 secs by neutralizing excess stomach acid.