How do you find fish oil that doesn't kill your stomach? Doesn't seem to matter if it's "burpless."
1. Try enteric coated fish oil. I think it solves the burp problem.
2. Try a fish oil which is in triglyceride form e.g. https://www.costco.com/Pure-Alaska-Omega-Wild-Salmon-Oil-100...
You might want to ask a pharmacist about this, I am not aware of any interaction like this that cannot be remedied by changing the supplementation time. Examine is also great at picking out the research.
I remember to take my fish oil more regularly when I'm taking a prescribed medicine. At one point I switched brands, but also hadn't been taking it regularly.
I started a new prescription and had stomach discomfort. I attributed it to the new med. So I stopped taking the new med, and it got better--- but that also meant I wasn't taking the fish oil regularly.
Eventually I got regular about taking the fish oil again without the prescription med and went ... wait! I'm having that symptom that prescription made gave me!
Correlation is not causation!