<p>Hypersensitivity to any of the ingredients or excipients; Patients with severe malaria according to WHO definition; First trimester of pregnancy; Patients with a family history of congenital prolongation of the QTc interval or sudden death or with any other clinical condition known to prolong the QTc interval such as patients with a history of symptomatic cardiac arrythmias with clinically relevant bradycardia or with severe cardiac disease; Patients with known disturbance of electrolyte balance e.g. hypokalaemia or hypomagnesemia; Patients taking any drug which is metabolized by the cytochrome enzyme CYP2D6 (e.g. flecainide, metoprolol, imipramine, amitriptyline, clomipramine).</p>