This is Dr. David
I am sorry your father has bad nausea
most nausea is caused by excessive stomach acid in the stomach causing gastritis inflammation.
there are over the counter stomach acid reducing agents like maalox, mylanta, zantac, prilosec which can help decrease stomach acid.
these often can help decrease stomach nausea.
pepto bismal can help some patients as well
let me know if you have other questions.
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