This book entitled, "Exploring Potential Drug Interactions in PAH and Diabetes" was produced with the goal of assisting UG and PG in understanding drug interactions in PAH and Diabetes. Pharmacokinetic and pharmacodynamic drug interactions are two common classifications. It may be advantageous for patients or harmful for them. This book was prepared with the intension of covering various drug interactions in diabetes and PAH. We attempt to collect all possible drug interactions of anti diabetics and PAH drugs in one book. To sustain the flow of information the contents are further organized theoretically and logically, We hope that this book proves to be very valuable to pharmacy students, lecturers, as well as researchers.