Allergic to Airitis (cetrizine) Please facilitate?

I had developed some rashes on my left knees which increased while itching. i went to a local doctor, where she precribed be to take Airitis which is your company product. i took it as advise (one at night). the problem started from here, within half an hour after taking this my leg fingers started paining (burning sensation) and within few mins (2or3 mins) it turned red (dark red) and started swelling near itching sensation, same kind of swelling, pain (burning sensation), and turning red happened surrounded by few places of my palm and on lips and lower part of my toe/foot. it was totally intolerable and i could not sleep adjectives the night due to this.
anted to know why this kind of allergic reaction has happened to me? Am i allergic to Airitis? if i am allergic to Airitis what component of Airitis causes this class of reaction so that i can avoid other medicine which contains this component.

please help me out near this problem so that it wont occur again and again.
Answers:    You might not be allergic to cetirizine, there are other ingredients in the medication as in good health.
Read the list and check if you know you are allergic to any one of them.
It is possible to be allergic to cetirizine...

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