A timely primer on the new reality of antisense and RNA inhibition for treating a broad range of diseases. The authors show how antisense oligonucleotides are being designed and studied in relation to hypertension, various cancers, inflammatory bowel disease, brain disorders, the blood-brain barrier, and drug delivery. Highlights include RNA-based therapies for many diseases, up-to-date methods and applications, and insight into the enormous potential to provide a new generation of drugs.