A Long Term Extension Study Evaluating Safety Of Sildenafil Citrate When Used To Treat Pulmonary Arterial Hypertension (PAH) In Children

This study has been completed.
Information provided by (Responsible Party):
ClinicalTrials.gov Identifier:
First received: September 8, 2005
Last updated: January 28, 2013
Last verified: January 2013

Active treatment, dose-blinded extension study evaluating the safety and long term efficacy of sildenafil citrate in children with PAH.

Condition Intervention Phase
Pulmonary Arterial Hypertension
Drug: Sildenafil citrate
Phase 3

Study Type: Interventional
Study Design: Allocation: Randomized
Endpoint Classification: Safety/Efficacy Study
Intervention Model: Parallel Assignment
Masking: Open Label
Primary Purpose: Treatment
Official Title: A Multicenter, Long-Term Extension Study to Assess Safety of Oral Sildenafil Citrate In The Treatment Of Subjects Who Have Completed Study A1481131

Resource links provided by NLM:

Further study details as provided by Pfizer:

Primary Outcome Measures:
  • Standard Safety tests. Ocular safety measures at Week 36, need for down-titration or discontinuation due to intolerability [ Time Frame: >1 year ] [ Designated as safety issue: Yes ]

Secondary Outcome Measures:
  • Assess 1 year efficacy data [ Time Frame: > 1 year ] [ Designated as safety issue: No ]

Enrollment: 221
Study Start Date: January 2004
Study Completion Date: December 2012
Primary Completion Date: December 2012 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Experimental: Sildenafil high dose
As per Protocol Amendment 8 (Aug 2011), all doses in the high dose treatment group were discontinued. Subjects who were receiving these doses and continued in the study were requested to down titrate.
Drug: Sildenafil citrate
Oral, subjects with body weight ≥8 - 20 kg: 20 mg 3 times a day (tid) subjects with body weight >20 - 45 kg: 40 mg 3 times a day (tid) subjects with body weight >45 kg: 80 mg 3 times a day (tid)
Experimental: Sildenafil Low dose Drug: Sildenafil citrate
Oral,10 mg 3 times a day (tid), only subjects with body weight >20 kg
Experimental: Sildenafil medium dose
As per Protocol Amendment 8 (August 2011), the dose 40 mg TID in the medium dose treatment group was discontinued. Subjects who were receiving this dose and continued in the study were requested to down titrate.
Drug: Sildenafil citrate
Oral, subjects with body weight ≥8 - 20 kg: 10 mg 3 times a day (tid); subjects with body weight >20 - 45 kg: 20 mg 3 times a day (tid); subjects with body weight >45 kg: 40 mg 3 times a day (tid)


Ages Eligible for Study:   1 Year to 17 Years
Genders Eligible for Study:   Both
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  • Patients must complete the 16 Week double-blind efficacy study A1481131.

Exclusion Criteria:

  • Any patient who did not complete Study A1481131.
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Please refer to this study by its ClinicalTrials.gov identifier: NCT00159874

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Sponsors and Collaborators
Study Director: Pfizer CT.gov Call Center Pfizer
  More Information

Additional Information:
No publications provided by Pfizer

Additional publications automatically indexed to this study by ClinicalTrials.gov Identifier (NCT Number):
Responsible Party: Pfizer
ClinicalTrials.gov Identifier: NCT00159874     History of Changes
Other Study ID Numbers: A1481156
Study First Received: September 8, 2005
Last Updated: January 28, 2013
Health Authority: United States: Food and Drug Administration

Keywords provided by Pfizer:

Additional relevant MeSH terms:
Hypertension, Pulmonary
Lung Diseases
Respiratory Tract Diseases
Vascular Diseases
Cardiovascular Diseases
Citric Acid
Hematologic Agents
Therapeutic Uses
Pharmacologic Actions
Chelating Agents
Molecular Mechanisms of Pharmacological Action
Vasodilator Agents
Cardiovascular Agents
Phosphodiesterase 5 Inhibitors
Phosphodiesterase Inhibitors
Enzyme Inhibitors

ClinicalTrials.gov processed this record on July 22, 2014