• Hypersensitivity to the active substance or to any of the excipients • Child-Pugh Class B or C, i. e., moderate to severe hepatic impairment (see section 5.2) • Baseline values of liver aminotransferases, i. e., aspartate aminotransferases (AST) and/ or alanine aminotransferases (ALT), greater than 3 times the upper limit of normal (see section 4.4) • Concomitant use of cyclosporine A (see section 4.5) • Pregnancy • Women of childbearing potential who are not using reliable methods of contraception (see sections 4.4, 4.5 and 4.6)