Actelion Ltd, the Swiss specialist pharmaceutical company, reported a 26.1% increase to CHF 405.6 million in net revenues for the first quarter as a result of continuing strong sales of Tracleer (bosentan), a treatment for pulmonary arterial hypertension (PAH). Tracleer sales rose by 22.5% to CHF 352.2 million and accounted for about 87% of first quarter revenue.
