Side effects
Some patients who take pharmaceutical preparations of digitalis may experience such side effects as too much muscle tone in the stomach and intestines, diarrhea, headache, loss of appetite, and vomiting. These side effects are the same as some symptoms of a foxglove overdose. Digitalis preparations can have toxic side effects due to overdose or other conditions. The most serious are arrhythmias, abnormal heart rhythms that can be life-threatening.