Start out with one 500mg. in am and
then 500 when you no longer have the disturbances
. Also drink a cup of Oatstraw tea at bedtime with several heaping tsp. of Peter Gillham's Natural Calm powdered magnesium mixed in.(Health Food Store) Put the mag. in slowly after you heat the water and put the teabag in as it will foam way up. Oatstraw tea will quell the disturbances in your heart rate such as palpitations and the tachycardia will diminish or disappear.