Drug- or Toxin-Induced Pulmonary Arterial Hypertension, also known as drug- or toxin-induced pah, is related to pulmonary hypertension, primary, 1. An important gene associated with Drug- or Toxin-Induced Pulmonary Arterial Hypertension is BMPR2 (Bone Morphogenetic Protein Receptor Type 2). Affiliated tissues include heart.