In large amounts, ginkgo may cause diarrhea, irritability and restlessness. Horehound is best known as a treatment for coughs and colds because the two key compounds it contains, marrubiin and marrubic acid, are good expectorants. But these compounds also have a normalizing effect on heart rhythm. You can make a tea using two to three teaspoons of the herb and drink a cup after lunch and dinner. With a name like cardiaca , this herb might be expected to help heart problems, and science confirms that it does.
Chinese studies show that it slows a rapid heartbeat, generally improving cardiac activity.
It also helps tranquilize the nervous system, reducing the anxiety, nervous tension and stress that may accompany or trigger heart problems. That sounds like a bit much to me. I'd suggest trying about a half-ounce in three cups of boiling water for two or three days to see if it helps. According to estimates I've seen, more than 70 percent of Americans may get insufficient magnesium . Maybe that's why we have so much arrhythmia.