for people ages 12 years and up (full criteria)
at La Jolla, California and other locations
study started
estimated completion



The main objective of the AC 055 303/SERAPHIN OL study, which will follow the AC 055 302/SERAPHIN study, will be to assess the long-term safety and tolerability of ACT 064992 in patients with symptomatic PAH.

Official Title

Long-term Single-arm Open-label Extension Study of the SERAPHIN Study, to Assess the Safety and Tolerability of ACT 064992 in Patients With Symptomatic Pulmonary Arterial Hypertension


Pulmonary Arterial Hypertension SERAPHIN ACT-064992 Familial Primary Pulmonary Hypertension Hypertension Macitentan


You can join if…

Open to people ages 12 years and up

  • Signed informed consent prior to initiation of any study-mandated procedure.
  • Patients with pulmonary arterial hypertension and having completed the event-driven study, AC 055 302/SERAPHIN, or Patients who have experienced a clinical worsening of PAH in AC 055 302/SERAPHIN and for whom a written approval to roll over into this study has been obtained from the Sponsor.
  • Women of childbearing potential must have a negative pre-treatment serum pregnancy test and must use a reliable method of contraception during study treatment and for at least 28 days after study treatment termination.

You CAN'T join if...

  • Any major violation of protocol AC 055 302/SERAPHIN.
  • Pregnancy or breast-feeding.
  • AST and/or ALT > 3 times the upper limit of the normal range.
  • Any known factor or disease that might interfere with treatment compliance, study conduct or interpretation of the results, such as drug or alcohol dependence or psychiatric disease.
  • Known hypersensitivity to ACT 064992 or any of the excipients.


  • University of California, San Diego
    La Jolla California 92037-2006 United States
  • Liu Center for Pulmonary Hypertension
    Torrance California 90502 United States


in progress, not accepting new patients
Start Date
Completion Date
Phase 3
Study Type
Last Updated