Fast Relief. Aspirin , Citric Acid, Sodium Bicarbonate. Relives: Heartburn. Acid Indigestion. Upset Stomach with Headache. Body Aches & Pains Take this product any time-morning, noon, or night-when you need fast relief from heartburn, acid indigestion, upset stomach with headache, body aches and pains. 100% Satisfaction guaranteed with all Walgreens products or your money back.