Is Your Medication Causing Bradycardia? What to Do Next - Psychiatry

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Medication-induced bradycardia?


Due to work-related sleep issues, I sought help from a psychiatrist who prescribed Remeron, Mirtazapine, and Buspirone.
Recently, I underwent surgery and discovered that I have bradycardia (heart rate around 40, with normal blood pressure).
After researching online, I suspect that this may be a side effect of Buspirone.
Should I first consult a cardiologist for a heart examination, or should I discuss this with my psychiatrist? Thank you.

Mr. Hsieh, 60~69 year old female. Ask Date: 2021/01/23

Dr. Lin Mianzhang reply Psychiatry


Hello Mr.
Hsieh: There are many causes of bradycardia.
If you have not experienced this condition before, it is indeed more likely to be caused by medication.
If you only have bradycardia without any other discomfort, you may consider discontinuing Mirtazapine and observe for a few days to see if your heart rate remains slow.
If bradycardia persists after stopping the medication for several days, it is advisable to consult a cardiologist.
If the bradycardia resolves after discontinuation, it indicates that the condition was likely caused by Mirtazapine, and it is not recommended to continue taking this medication.
Additionally, I suggest informing your psychiatrist about this situation during your next appointment.
However, if you experience other symptoms along with bradycardia, it is recommended that you seek medical attention from a cardiologist first.
Wishing you safety and good health!

Reply Date: 2021/01/23

More Info


Bradycardia, defined as a slower than normal heart rate (typically less than 60 beats per minute), can indeed be a side effect of certain medications, including those used in psychiatric treatment. In your case, you mentioned taking medications such as fluoxetine (known as Prozac), which is an SSRI (selective serotonin reuptake inhibitor), and other medications that may have sedative effects. It’s important to address your concerns about bradycardia, especially since you are experiencing a heart rate as low as 40 beats per minute.

First, it is crucial to understand the potential link between your medications and bradycardia. SSRIs, while generally safe, can have side effects, and in rare cases, they may contribute to heart rhythm abnormalities. Other medications you mentioned, particularly those with sedative properties, can also affect heart rate. Therefore, it is wise to consider the possibility that your current medication regimen may be influencing your heart rate.

Given your situation, the best course of action would be to consult both your psychiatrist and a cardiologist. Here’s why:
1. Consulting Your Psychiatrist: Since your psychiatrist prescribed the medications, they are familiar with your mental health history and the rationale behind your treatment plan. Discussing your symptoms of bradycardia with them is essential, as they can evaluate whether the current medications are appropriate or if adjustments are necessary. They may consider switching medications, adjusting dosages, or monitoring your heart rate more closely.

2. Consulting a Cardiologist: A cardiologist can perform a thorough evaluation of your heart health, including an electrocardiogram (ECG) to assess your heart's electrical activity and possibly other tests to determine the cause of your bradycardia. They can help rule out any underlying cardiac issues that may be contributing to your symptoms. If the bradycardia is significant or symptomatic (e.g., causing dizziness, fatigue, or fainting), the cardiologist may recommend further interventions.

3. Monitoring Symptoms: In the meantime, keep track of any symptoms you experience, such as dizziness, fatigue, or palpitations. This information will be helpful for both your psychiatrist and cardiologist in determining the best course of action.

4. Medication Review: It may also be beneficial to review all medications you are currently taking, including over-the-counter drugs and supplements, as they can interact with your prescribed medications and contribute to bradycardia.

5. Lifestyle Considerations: While awaiting your appointments, consider lifestyle factors that may influence your heart rate, such as caffeine intake, hydration, and stress levels. Reducing caffeine and managing stress through relaxation techniques may help improve your overall heart health.

In summary, it is essential to address your concerns about bradycardia with both your psychiatrist and a cardiologist. This collaborative approach will ensure that you receive comprehensive care, addressing both your mental health needs and any potential cardiac issues. Always prioritize your health and communicate openly with your healthcare providers about any changes in your condition or concerns regarding your medications.

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