Sikkerhed og effekt af sildenafil ved samtidig anvendelse af andre lægemidler for pulmonal arteriel hypertension (f. eks bosentan, iloprost) er ikke undersøgt i kontrollerede kliniske studier.
The efficacy and safety of sildenafil co-administered with other treatments for pulmonary arterial hypertension (eg. bosentan, iloprost) has not been studied in controlled clinical trials.