Leflunomide
The mere existence of the entity 'leflunomide pneumonitis' is disputed (PMID 26980577). Somes cases were receiving methotrexate concomitantly. The condition is rare if it at all exists outside Japan (PMID 26980577)
The Drug-Induced Cardiotoxicity Website and App
Frequency - Incidence
Incidence of cardiac adverse event(s) due to the specific drug as assessed by number of reported/published cases in the literature. Red digits in stars indicate: 0 = Very rare, questionable signal · 1 = < 10 cases · 2 = 10-50 cases · 3 = 50–100 cases · 4 = 100-200 cases · 5 = >200 cases
Evidence level/grade
Evidence level for cardiac adverse event(s) due to the specific drug as estimated using Hill’s (1965), Naranjo’s (1981), and Bégaud’s (1985) criteria applied to published cases. Blue digits in stars indicate: 0 = Questionable · 1 = Low · 2 = Moderate · 3 = Robust · 4 = Definite · 5 = Unquestionable, pathognomonic