H2 Blockers
nizatidine
ranitidine
famotidine
cimetidine
PPIs
Omeprazole (Prilosec),
Esomeprazole (Nexium),
Lansoprazole (Prevacid),
Rabeprazole (AcipHex)
Pantoprazole (Protonix)
Dexlansoprazole (Dexilant)
All are listed by Drugs.com as having a drug interactiuon with Cymbalta. They effect the absorbtion of antidepressants. This position is upheld by medical journal reports. It should also be mentioned that many compete with Cymbalta for degradation in the liver and thiis can cause a change in blood levels of the antidepressant.
My suggestion would be Lansoprazole (Prevacid), as it does not compete with Cymbalta for degradation in the liver. As a short term treatment I would consider sodium bicarbonate. It does not contain magnesium, aluminum or calcium and therefore can be taken at the same time as other meds. Be aware that the use of sodium bicarbonate will generate salt in the stomach as a byproduct of acid neutralization. Some individuals are sensative to salt intake and it increases anxiety. If salt in your foods does not cause a problem then this may be an opotion.
Antacids
Of the three classes, antacids are the fastest acting. They start providing relief to the patient within five minutes. As such, should be used as needed (on-demand) for breakthrough symptoms that occur ideally less than once per week. They don’t prevent GERD. They simply neutralize stomach pH decreasing the exposure of the esophageal mucosa to acid from the stomach during episodes of reflux. Antacids only work for 30 to 60 minutes and may cause side effects like constipation or diarrhea depending on which antacid you use.
Over the counter antacids
aluminum hydroxide
magnesium hydroxide
magnesium carbonate
sodium bicarbonate
calcium carbonate
Antacids containing magnesium and calcium should not ve taken within 2 hours of another medication. Calcium compounds may cause constipation and magnesium compounds mat cause diarrhea. Aluminum hydroxide does not have that effect but aluminum increases the risk of Alzheimer's Disease.