Alcoholic beverages are currently exempt from mandatory labeling of major allergens.
Typically contains barley, yeast, and hops. It is fermented but not really separated in any way except sedimentation.
Wine and various fining agents
Potentially allergenic fining agents include: casein (milk), egg white, chitosan (crustaceans), isinglass (fish). According to this paper (Vassilopoulou et al. Clinical and Translational Allergy 2011, 1:10), trace amounts of fining agents were not detectable in the finished wine but did cause positive skin prick test results in allergic individuals and may cause mild reactions.
Vegan wine, since almost all organic fining agents are derived from animals. (barnivore.com is a searchable database for vegan booze.)
Distilled spirits such as vodka, brandy (wine), tequila (agave).
Aside from allergies, there are many pathways that alcohol can cause problems. You might have an issue with alcohol itself, or its amines or other chemical content.
As for us, we avoid alcohol. For me it causes headaches and a low mood that I just don’t want to deal with anymore and my partner flushes (common genes in Asians) and also has bruxism and GI issues when he has a drink.