Safety and Treatment Satisfaction in Adults With Chronic ITP After Switching to Avatrombopag From Eltrombopag or Romiplostim

Inclusion Criteria: * Subject has been undergoing treatment for primary ITP with eltrombopag or romiplostim for at least 90 days prior to the Screening Visit/Visit 1. * Subject has had a previous response (at any time) to either eltrombopag or romiplostim, defined as at least 2 platelet counts ≥50×10⁹/L. Subject is willing and able to comply with all aspects of the protocol, including completing the self-administered Treatment Satisfaction Medication Questionnaire (TSQM). Exclusion Criteria: * Subject is currently receiving chemotherapy or radiation for any form of cancer. * Subject with conditions that are likely to prevent them from accurately and reliably completing study assessments, including evidence of moderate to severe dementia, and/or severe and progressive medical illness, as determined by the Investigator. * Any previous avatrombopag use. * Previous participation in this study; a subject may not re-enroll after prior discontinuation or completion. * Enrollment in another clinical study with any investigational drug or device within 30 days of Baseline (or 5 half-lives, whichever is longer); however, participation in observational studies within the previous 30 days is permitted.