This portable book is an essential guide for those prescribing two or more drugs for simultaneous use. Providing critical information on potential adverse effects, the book is organized by drug class in a convenient, user-friendly format. Interactions that are likely to give rise to life-threatening conditions and which must therefore be completely avoided are clearly highlighted. The book also details less threatening, but nonetheless important interactions necessitating practical measures such as frequent monitoring and advice to patients. The range of coverage includes not only prescription drugs but also over-the-counter medications, herbal remedies, and dietary supplements.