I took penicillin but I have an augmentin (amoxicillin and clavulanate) allergy, and now have rask?

Augmentin (amoxicillin and clavulanate) This is a brand name for a drug which contains Amoxicillin and clavulanic acid. Amoxicillin is a derivative of penicillin and is 100% cross-allergenic. Be very careful and if you get worse see a doctor asap - and hopefully not the same one who gave this to you if they knew you were penicillin allegic.