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| A Study to Assess the Efficacy and Safety of 20, 40, and 80mg of Sildenafil Three Times a Day in the Treatment of Pulmonary Arterial Hypertension |
| A Multinational, Multi-centre, Randomised, Double-blind, Double-dummy, Placebo-controlled Study to Assess the Efficacy and Safety of 20, 40, and 80mg TID Sildenafil in the Treatment of Pulmonary Arterial Hypertension in Subjects Aged 18 Years and Over |
| To evaluate the effect of three doses of oral sildenafil (20, 40 and 80 mg three times a day [TID]) on exercise capacity, as measured by the 6-Minute Walk test, as well as the safety and tolerability, after 12 weeks of treatment in subjects with pulmonary arterial hypertension who are aged 18 years and over. To investigate the plasma concentration-effect relationship and to determine the population pharmacokinetic (PK) parameters. |
| Not Provided |
| Interventional |
| Phase 3 |
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Double (Participant, Investigator)
Primary Purpose: Treatment |
| Hypertension, Pulmonary |
- Drug: sildenafil
sildenafil 40 mg by mouth three times daily (TID), with doses at least 6 hours apart, for 12 weeks - Drug: sildenafil
sildenafil 80 mg by mouth three times daily (TID), with doses at least 6 hours apart, for 12 weeks; initially, patients received 40mg TID for one week and were then up-titrated to 80mg TID - Drug: placebo
placebo by mouth three times daily (TID), with doses at least 6 hours apart, for 12 weeks - Drug: sildenafil
sildenafil 20 mg by mouth three times daily (TID), with doses at least 6 hours apart, for 12 weeks
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- Active Comparator: Arm 1
Intervention: Drug: sildenafil - Active Comparator: Arm 2
Intervention: Drug: sildenafil - Active Comparator: Arm 3
Intervention: Drug: sildenafil - Placebo Comparator: Arm 4
Intervention: Drug: placebo
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| Wirostko BM, Tressler C, Hwang LJ, Burgess G, Laties AM. Ocular safety of sildenafil citrate when administered chronically for pulmonary arterial hypertension: results from phase III, randomised, double masked, placebo controlled trial and open label extension. BMJ. 2012 Feb 21;344:e554. doi: 10.1136/bmj.e554. |
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| Completed |
| 275 |
| Same as current |
| November 2003 |
| Not Provided |
Inclusion Criteria: Included patients had primary pulmonary arterial hypertension, pulmonary hypertension secondary to connective tissue disease, or pulmonary hypertension with surgical repair at least 5 years previously; a mean pulmonary artery pressure greater than or equal to 25 mmHg and a pulmonary artery wedge pressure of less than or equal to 15 mmHg at rest, via right heart catheterisation within 21 days prior to randomisation; and a baseline 6-Minute Walk test distance of 100 m to 450 m. Exclusion Criteria: Subjects with congenital heart disease, pulmonary hypertension due to thromboembolism, HIV, chronic obstructive airway disease, congestive heart failure or schistosomiasis; subjects with significant (ie > 2+) valvular disease other than tricuspid regurgitation or pulmonary regurgitation; and acutely decompensated heart failure within the previous 30 days; subjects with pulmonary hypertension secondary to any other etiology other than those specified in the inclusion criteria. |
| Sexes Eligible for Study: | All |
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| 18 Years and older (Adult, Older Adult) |
| No |
| Contact information is only displayed when the study is recruiting subjects |
| Australia, Belgium, Brazil, Czech Republic, Denmark, France, Germany, Hong Kong, Hungary, Israel, Italy, Korea, Republic of, Malaysia, Mexico, Netherlands, Norway, Poland, Singapore, South Africa, Spain, Sweden, United Kingdom, United States |
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| NCT00644605 |
| A1481140 |
| No |
| Not Provided |
| Not Provided |
| Director, Clinical Trial Disclosure Group, Pfizer, Inc. |
| Pfizer |
| Not Provided |
| Study Director: | Pfizer CT.gov Call Center | Pfizer |
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| Pfizer |
| April 2015 |
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