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Hello, my name is***** and I have over 20 years of experience as a veterinarian.
I'm sorry to hear that your fellow with megaesophagus has been experiencing painful reflux.
You can absolutely give these pups acid reducing medication like Pepcid (famotidine) or Prilosec (omeprazole).
Prilosec might be better for him as it has some promotility properties.
You can try either:
1) Pepcid-ac (famotidine) at a dose of one 10mg tablet per 20 to 40 pounds of body weight every 12 hours.
2) Prilosec (omeprazole) at a dose of one 20mg tablet per 40 to 80 pounds of body weight every 24 hours.
I would also extend the time that he is held upright.
Best of luck with your fellow, please let me know if you have any further questions.