I made this book in a simple way to assist and upgrade the pharmacological concepts and its details that should be well known for healthcare students and professionals including nurses, pharmacists and physicians. To understand pharmacology, we have to understand the concepts first, so after that we can understand the drugs complex details. To make a perfect reading, try to see the references and use the network to assist you. Hope to you an enjoyable reading. Your brother Abdullah Naji Al.Kattan.