The only way to avoid alcohol intolerance symptoms or an allergic reaction is to avoid alcohol or the particular beverage or ingredients that cause the problem. For a minor reaction, over-the-counter or prescription antihistamines may help reduce symptoms, such as itching or hives. However, antihistamines can't treat a serious allergic reaction.
If you've had a severe allergic reaction to a certain food, wear a medical alert bracelet or necklace to let others know you have an allergy, in case you're unable to communicate during a severe reaction. Ask your doctor if you need to carry emergency epinephrine (adrenaline) in the form of an autoinjector (EpiPen, Auvi-Q). This prescription device has a concealed needle that injects a single dose of epinephrine when you press it against your thigh.