Co-administration with PDE5 inhibitors (such as sildenafil, tadalafil, vardenafil) (see Dosage & Administration and Interactions).
Severe hepatic impairment (Child Pugh C).
Hypersensitivity to the active substance or to any of the excipients listed in Description.
Pregnancy (see Precautions, Interactions, and Use in Pregnancy & Lactation).
Co-administration with nitrates or nitric oxide donors (such as amyl nitrite) in any form including recreational drugs called 'poppers' (see Interactions).
Concomitant use with other soluble guanylate cyclase stimulators.
Patients with systolic blood pressure < 95 mm Hg at treatment initiation.
Patients with pulmonary hypertension associated with idiopathic interstitial pneumonias (PH-IIP) (see Pharmacology: Pharmacodynamics under Actions).