Call emergency services immediately if tachycardia occurs with chest pain, fainting, severe shortness of breath, confusion, or signs of shock
Sit or lie down and rest
Stop physical activity
Try slow, deep breathing
Perform vagal maneuvers only if advised by a clinician and if appropriate for the situation
Drink water if dehydration is suspected and swallowing is safe
Avoid caffeine, nicotine, alcohol, and stimulant drugs
Check for and treat fever, pain, anxiety, or dehydration
Take prescribed heart medicines exactly as directed
Seek urgent medical evaluation for persistent, recurrent, or unexplained tachycardia
Treat the underlying cause, such as infection, anemia, thyroid disease, electrolyte imbalance, or medication side effects
Follow up with a healthcare professional for diagnosis and long-term management