Hi I Was Told That I Have A Specific Allergy

hi i was told that I have a specific allergy to a bi-polar medication ( which I was told to stop using ) cannot remember what it was called. I need the information to update my allergy list... It starts with the letters AR
symptoms are: nerve ending in head, face, neck and shoulders all feel like ant bites hurt and itch at the same time if you could help me with this it would be appreciated