Samtidig anvendelse af bosentan (en moderat induktor af CYP3A4, CYP2C9 og muligvis af CYP2C19) 125 mg 2 gange dagligt og sildenafil 80 mg 3 gange dagligt (ved steady state) i 6 dage gav et fald i sildenafils AUC på 63% hos raske frivillige forsøgspersoner.
Co-administration of bosentan (a moderate inducer of CYP3A4, CYP2C9 and possibly of CYP2C19) 125mg twice daily with sildenafil 80 mg three times a day (at steady state) concomitantly administered during 6 days in healthy volunteers resulted in a 63% decrease of sildenafil AUC.