Dioxin? There is no single compound known as dioxin.
Digitalis (DIJ'ih-TAL'is) is also known as digoxin (di-JOKS'in) and digitoxin (dij"ih-TOKS'in). It's a drug that strengthens the contraction of the heart muscle, slows the heart rate and helps eliminate fluid from body tissues. It's often used to treat congestive heart failure and is also used to treat certain arrhythmias (ah-RITH'me-ahz).
Digitalis has been described in medical literature for over 200 years. It's derived from the foxglove plant.