Cannabis is believed to be one of the oldest cultivated plants dating back 12,000 years and demonstrates medicinal properties including immune support, anti-inflammatory effects, and cancer fighting potential. As cannabis is getting regulatory approval in the United States, clinicians need guidelines to prescribe medical marijuana for various conditions. This book presents information to healthcare professionals on cannabis with focus on medical cannabis. It is a science-based overview including dosing needs for practitioners to advise patients appropriately. Attention is given to regulatory status, limits to research, and pathogenic issues needed to provide a safe, therapeutic product.