HomeAnswersCardiologypalpitationsI have irregular heartbeat after taking higher dose of stimulant. Please help.

Do I need emergency care for palpitations due to high stimulant dose?


The following is an actual conversation between an iCliniq user and a doctor that has been reviewed and published as a Premium Q&A.

Medically reviewed by

Dr. K. Shobana

Published At November 12, 2015
Reviewed AtMay 31, 2023

Patient's Query

Hi doctor,

I took my usual stimulant this morning, but at a higher dose (Vyvanse 50 mg, rather than the usual 30 mg). In addition to the usual coffee, I have tried for the first time a dietary supplement with caffeine (200 mg), Niacin (10 mg, 50% daily value), and vitamin B12 (1000 mcg, 16,667% daily value). Now, I am experiencing accelerated heart rate and irregular heartbeat. It was usual with what I have taken so far, and I will not repeat this mistake. However, I would like to understand whether I need urgent care or not. I have attached the ECG reports, and I have recorded them with my mobile as it has a heartbeat sensor.


Welcome to icliniq.com.

I have thoroughly gone through your case and can understand your health concerns. I want to assure you that everything will be fine if proper care and treatment are opted in for. I have seen the heart beat monitored through your smartphone (attachment removed to protect the patient's identity). I do not think this is a medical emergency and you need not worry much. Relax and sit calm. I am happy to know that you will not do it again. It is necessary to know that if you will do it again and again it will have very dangerous effect on the heart and may cause severe damage or heart failure due to enlargement or sudden cardiac death which occurs in severe cases when heart gets an abnormal rhythm (arrhythmia). The heart beats in the mobile sensor are not reliable but I have seen hundreds of them. So when I decode yours, it is harmless for now. There is nothing significant. When there is a high dose of stimulants, there is an increase in the heart rate due to the effect of the drugs. It is sensed by the sensors and leads to an increase in parasympathetic activity. This causes a decrease in the heart rate, and thus heartbeats become normal. This is a natural reflex activity that happens in all. It is necessary to know if you do it again, this will result in dangerous effects on the heart due to cardiac enlargement or sudden cardiac death. The heartbeats in the mobile sensor are not reliable. I suggest taking good rest and plenty of water and refraining from caffeinated drinks.

Same symptoms don't mean you have the same problem. Consult a doctor now!

Dr. Muhammad Majid Hanif
Dr. Muhammad Majid Hanif


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