<p>Treatment with bosentan has been associated with dose dependent elevations in liver aminotransferases and decreases in haemoglobin concentration. Other side effects include Anaemia, haemoglobin decrease, Thrombocytopenia, Neutropenia, leucopenia, Hypersensitivity reactions, Headache, Syncope, Palpitations, Flushing, Hypotension, Gastroesophageal reflux disease, Aminotransferase elevations associated with hepatitis and/or jaundice, Liver cirrhosis, liver failure (rarely), Erythema, Diarrhoea, Oedema, fluid retention.</p>