Occasionally patients can experience an allergic reaction when taking certain medications such as antibiotics. If allergic reaction symptoms appear such as; itching, raised bumps or blotchy areas on the skin, mild swelling, or nausea, discontinue your medication and take an antihistamine immediately. If your symptoms worsen, or if you have difficulty breathing, and/or vomiting etc. you should seek medical care immediately. A severe allergic reaction can be fatal. If you are experiencing severe symptoms, especially difficulty breathing, call 911.