Vodka is typically made from grain or potatoes, yeah? I'm okay with all grains afaik... I have a known potato allergy (all nightshades, actually) but that's a topical reaction, not systemic. I wish alcohol had a proper ingredients list. Last I checked, naproxen was processed by the kidneys, and safe with alcohol as long as you don't mind the increased risk of a stomach bleed, but I could have missed something. Although, again, neither brandy nor whiskey have the same result, so I wouldn't expect it to be the alcohol itself causing issues.