Active substance
Anhydrous Citric Acid, Sodium Bicarbonate (heat-Treated)
3 products from 2 companies contain this in United States.
3 without prescriptionTablet, Effervescent
Available without a prescription
Alka-Seltzer Heartburn1000 mg + 1940 mgWithout prescription Bayer HealthCare LLC. · Anhydrous Citric Acid, Sodium Bicarbonate (heat-Treated)Alka-Seltzer Heartburn Relief Extra Strength1976 mg + 1000 mgWithout prescription Bayer Healthcare LLC · Anhydrous Citric Acid, Sodium Bicarbonate (heat-Treated)Alka-Seltzer Heartburn Relief Lemon Lime1650 mg + 1000 mgWithout prescription Bayer Healthcare LLC · Anhydrous Citric Acid, Sodium Bicarbonate (heat-Treated)
Same substance is not the same product. Strength, form, release mechanism and other ingredients all differ. Whether one can replace another is a decision for a pharmacist.