A THERAPEUTIC CLASSIFICATION OF USEFUL DRUGS Drugs Used to Contract the Blood-vessels: Vasoconstrictors. Drugs Used to Dilate the Blood-vessels: Vasodilators . DRUGS USED FOR ACTION ON THE CENTRAL NERVOUS SYSTEM Drugs Used to Stimulate the Brain and Spinal Cord Drugs Used to Depress the Brain and Spinal Cord. Drugs Used to Cause Sleep: Hypnotics Drugs Used to Cause General Anesthesia: Anesthetics |