Visitors to the CredibleMeds® website can use Quick Search to find drugs that are in the QTDrugs lists. Access to download the lists of QTdrugs REQUIRES REGISTRATION so that users can be notified when the lists have been revised. Individuals with Barth syndrome are an increased risk of experiencing ventricular arrhythmia. Therefore it is advised that whenever possible individuals with Barth syndrome not be prescribed drugs that are on the drugs to avoid list for long QT. The information provided through the CredibleMeds® website is intended to help patients, family members and healthcare providers to make these informed decisions when prescribing or taking medications.