swelling of the face, lips, mouth, tongue or throat, wheezing or difficulty breathing; difficulty swallowing − Bleeding of the stomach or intestines (can lead to bloody stools or vomiting), inflammation of the intestine or colon, inflammation of the pancreas, nausea (feeling sick) − Serious skin conditions such as Stevens-Johnson syndrome, exfoliative dermatitis and toxic epidermal necrolysis (can cause rash, blistering or peeling of the skin) − Liver failure, liver damage and severe liver inflammation (sometimes fatal or requiring liver transplant).