You can read detailed info at health.howstuffworks or allergy-central but my own personal reaction might be useful. I have a severe shellfish allergy that didn't begin until I was about 14. Until then I had minor problems after eating shrimp but now if I had the slightest exposure I suffer from anaphylaxis. My lips tingle and swell up first, this is usually my first warning sign and I have to immediately take Benadryl. I take the childrens elixir since it seems to work much faster. Then my heart speeds up and I have increased difficulty in breathing. The first time this occurred I nearly died since no one knew what was happening or why. Like I said, I'd eaten shellfish all my life without any problems like this. Eventually my breathing was resticted to a tiny space about the size of a dime and it was quite frightening. Now I carry benadryl or a generic equivalent with me in my backpack and car since I never know when someone will use lobster or crab juice as a seasoning without telling me. I tend to perspire when this happens but that might be more due to nerves than to any specific response to the allergy.
People who are allergic to penicillin can experience allergic reactions in different ways. Some examples of an allergic reaction to penicillin can include: -hives -rash -itchy skin -wheezing -swelling of the lips, tongue, or face The most serious allergic reaction to penicillin is an anaphylactic response, which can be life-threatening. Anaphylactic reactions develop immediately after penicillin exposure in highly sensitive people. Anaphylactic reactions cause the airways to constrict and lower blood pressure. Signs and symptoms include: -constriction of the airways -shock associated with a marked decrease in blood pressure -weak and rapid pulse -hives and itching -dizziness or fainting -flushed or pale skin -nausea, vomiting, or diarrhea
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