The most common side effects with Lysodren (seen in more than 1 patient in 10) are increased blood levels of liver enzymes, cholesterol and triglycerides (a type of fat), leucopenia (low white blood cell counts), prolonged bleeding time, ataxia (difficulty co-ordinating movements), paraesthesia (abnormal sensations like pins and needles), vertigo (a spinning sensation), sleepiness, mucositis (inflammation of the mucous membranes, such as the lining of the mouth), vomiting, diarrhoea, nausea (feeling sick), epigastric discomfort (discomfort around the stomach), skin rash, myasthenia (muscle weakness), adrenal insufficiency (reduced adrenal gland activity), anorexia (loss of appetite), asthenia (weakness), gynaecomastia (breast enlargement) and confusion.