Can pregabalin slow the heart rate (bradycardia)?
Pregabalin can affect the nervous system and, in some people, may contribute to abnormal heart rhythms or changes in heart rate. Slower-than-normal heart rate (bradycardia) is reported as a potential adverse effect, along with other cardiovascular events such as dizziness or fainting that can occur alongside heart-rate changes. If you notice a markedly slow pulse or symptoms like fainting, chest pain, or shortness of breath, seek urgent care.
What symptoms suggest pregabalin is affecting your heart rate?
People may notice:
- A pulse that is slower than usual (especially if accompanied by feeling unwell)
- Dizziness or lightheadedness
- Fainting or near-fainting
- Weakness or unusual fatigue
Because pregabalin can also cause dizziness and sedation, it can be hard to tell whether symptoms are from blood pressure changes, the medication’s effects on the nervous system, or a rhythm issue. Persistent symptoms, worsening dizziness, or fainting should be evaluated promptly.
Why might pregabalin cause slow heart rate in some patients?
The exact mechanism for bradycardia with pregabalin is not fully predictable from routine dosing patterns, but risk can increase when pregabalin’s effects overlap with other factors that influence heart rhythm or conduction, such as:
- Other medicines that slow heart rate or affect cardiac conduction (for example, some beta-blockers or certain antiarrhythmics)
- Dehydration or low blood pressure
- Electrolyte problems (like low potassium or magnesium)
- Pre-existing heart conduction problems
What to do if your heart rate drops after starting or increasing pregabalin
If your pulse is slow and you feel symptoms:
- Check your pulse again and note the time relative to your dose
- Contact the prescribing clinician the same day for guidance, especially if you have dizziness, fainting, chest pain, or breathing trouble
- Do not stop pregabalin abruptly without medical advice, but clinicians may recommend dose adjustment or a different regimen if a cardiac issue is suspected
If you have severe symptoms (fainting, chest pain, severe shortness of breath, confusion, or very low heart rate), treat it as an emergency.
Could pregabalin be affecting blood pressure rather than the heart rate?
Sometimes what feels like a “slow heart” can be related to low blood pressure (hypotension), which can cause dizziness or faintness. Pregabalin commonly causes dizziness and sleepiness, and it can contribute to falls or lightheadedness. Clinicians may check both blood pressure and pulse to determine whether the issue is rhythm-related or pressure-related.
What questions to ask your doctor or pharmacist
To connect your symptoms to the medication, ask:
- “Could pregabalin be causing bradycardia in my case?”
- “Should I adjust the dose or pause the medication until I’m checked?”
- “Do any of my other medicines raise my risk?”
- “Would you recommend an ECG or monitoring (Holter)?”
- “What pulse or symptom threshold should make me go to the ER?”
When to get emergency help
Go to the ER or call emergency services if slow heart rate comes with:
- Fainting or inability to stay awake
- Chest pain/pressure
- Severe shortness of breath
- Confusion
- A very low pulse that doesn’t improve and is accompanied by symptoms
If you tell me your dose, how long you’ve been on pregabalin, your typical heart rate vs the current one, and any other meds you take, I can help you think through what might be most likely and what to ask your clinician next.