The best way to prevent an allergic reaction is to avoid the substance that you are allergic to altogether. Advice for any major allergy is widely available online. As you might expect, the NHS website is a good starting point in this regard. Those at risk of severe allergic reactions like anaphylaxis should carry at least two adrenaline auto-injectors at all times. Make friends, family and colleagues aware of your allergy so that they can administer your adrenaline injections if the worst happens. For when you are alone and in public, consider wearing a MedicAlert or Medi-Tag medallion or bracelet to make strangers aware of the severity of your allergy at just the right moment.