Given the task definition and input, reply with output. In this task, you will be given sentences in which your task is to recognize the name of the drug or medicine. Drugs are substances that change a person's mental or physical state. They can affect how your brain works, how you feel and behave, your understanding, and your senses. Although there might be several correct answers, you need to write one of them.

The failure of therapy with disopyramide and mexiletine to reproduce this observation suggests either a previously unreported electrophysiologic effect of, or idiosyncratic response to, procainamide.
procainamide