While drugs in the class amoxicillin is in can cause severe allergic reactions, more mild allergy symptoms, such as a
rash, can occur at any time during
treatment, even up to a week after
treatment has ceased. For some people who are allergic to amoxicillin the side-effects can be deadly. If you take this drug again, the reaction could be worse, so you need this drug listed as an allergy for you forever.