Sit or lie down and rest quietly
Take slow, deep breaths
Avoid caffeine, nicotine, and energy drinks
Drink water if you may be dehydrated
Cool down if you are overheated
Reduce stress and anxiety
Avoid strenuous activity until your pulse settles
Try vagal maneuvers only if advised by a clinician
Check whether any medicines or supplements may be increasing your pulse
Seek medical care if the fast pulse is persistent, severe, or comes with chest pain, shortness of breath, dizziness, or fainting