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One of the most common symptoms of an allergic reaction is an itchy rash
A lamictal rash is an allergic reaction. Like all allergic reactions, Stevens-Johnson Syndrome can occur. This is potentially fatal. So the lamictal rash is as serious as rash can get. After checking with a doctor to make sure you really do have the lamictal rash, you need to quit taking lamictal immediately. If you don't the chances of you developing Stevens-Johnson Syndrome increases greatly.
itchy rash
Atarax, a prescribed medication.
According to RX List:A very serious allergic reaction to this drug is rare. However, get medical help right away if you notice any symptoms of a serious allergic reaction, including: rash, itching/swelling (especially of the face/tongue/throat), severe dizziness, trouble breathing.
If you have a skin rash due to food intoxication, it will likely be raised, red and itchy. You should see a doctor if you think it could be an allergic reaction.
rash
Skin
Some people are allergic to penicillin and can develop a rash, or more serious problems.
Benadryl is OK but be very careful some patients have a reaction to penicillin called Anaphylaxis that is a serious allergic reaction that is rapid in onset and may cause death. It typically results in a number of symptoms including an itchy rash, throat swelling, and low blood pressure.
A caffeine could possibly cause a rash, but only if you have some kind of allergic reaction to caffeine.
It's very very possible. It could also be an allergic reaction.