Sodium Bicarbonate Powder? 100g? This antacid powder is to be mixed with water and provides effective relief of heartburn? acid indigestion? sour stomach and symptoms of upset stomach associated with these conditions? or overindulgence in food or drink.Relieves heartburnRelieves sour stomachRelieves acid indigestionRelieves overindulgence in food or drinkRelieves upset stomach due to these symptoms