The therapeutic use of cannabis follows the maxim: Start low, go slow! That is how to reach the optimum dose and efficacy with minimum side effects. But this balancing act requires relevant information. Our authors, recognised cannabis experts, have put everything important together in one place: - Indications and routes of administration - Effects, interactions and side effects - Selection and prescription of suitable cannabis-based medicines - Practical tips, e.g. about travelling or driving and road use The 4th edition includes updates on the legal situation, the pharmacology of the endocannabinoid system and of cannabidiol. Directions for use and tips for patients taking cannabis have been added, together with the new prescribing modalities for physicians as well as a list of available cannabis products. This prescribing aid covers the expanded range of cannabis-based medicines and the current legal position.