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Bosentan PK in PAH Patients Concentrations after 62.5 mg Single Dose. 9409.01. Interaction with Ketoconazole Bosentan Trough Plasma Levels. 9416.01. Choice of Doses for Clinical Trials. Maintenance / Target Dose
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Bosentan PK in PAH PatientsConcentrations after 62.5 mg Single Dose 9409.01
Interaction with KetoconazoleBosentan Trough Plasma Levels 9416.01
Choice of Doses for Clinical Trials Maintenance / Target Dose • 100/125 mg bid – top of hemodynamic dose response (decrease BP) • Higher doses – higher incidence of elevated LFTs • 250 mg bid – exploratory Starting dose • 62.5 mg bid for 4 weeks(due to increased worsening HF with high starting doses and rapid up-titration in CHF patients) 9459.01
Long-term Exposureto Bosentan Exposure (years) Total pt-yrs Range Mean SD Studies N PAH Studies NC15462+OL ENABLE* 235 267 1613 0.58 0.37 0.87 1.16 1.13 0.48 0.07 – 1.71 0.00 – 4.11 0.00 – 1.93 137.2 233.5 1824.2 * Treatment still blinded (approximately 807 patients on bosentan) 9511.01
Change in WBC and Platelets8 Placebo-controlled Studies Placebo Bosentan Mean change from BL WBC Platelets Marked decrease [n (%)] WBC Platelets 0.0% 3.2% 2/273 (0.7%) 2/262 (0.8%) 9.3% 0.9% 7/640 (1.1%) 3/600 (0.5%) 9837.01
“1-800-ACTELION” • Central clearing house • Patient + physician database • PHYSICIAN • Liver Monitoring reminder • Spontaneous AE reporting • PATIENT • Ship drug • Liver monitoring reminder • Follow-up discontinuations/ AE reporting Patient Registry(To Be Discussed with the FDA) Specialty pharmacy network 9858.01