The article offers information on medicinal cannabis. The plant originated in central Asia or western China where it was used for its alleged healing properties for millennia. It dates back to 2800 BC when it was listed in the pharmacopoeia of Emperor Shen Nung, known as the father of Chinese medicine. Its three recognized species are CAnnabis Sativa, Cannabis Indica and Cannabis Ruderalis. Its active ingredients are cannabinoids, terpenes and flavonoids.