Does Paxil cause tachycardia? (5+ factors)

In this article, we will discuss whether Paxil increases the rate of heart as a potential side effect or not. We will also discuss what tachycardia is and its implications on the heart, the link between Paxil and tachycardia, what research suggests on this, factors which can contribute to the increase in heart rate while using Paxil and management strategies to overcome this side effect.

Does Paxil cause tachycardia?

Yes, Paxil (paroxetine) can cause tachycardia as a potential side effect. Not everyone who takes Paxil will experience tachycardia, as individuals are different and respond differently to medications. (1,2)

Paxil is an antidepressant primarily used for the treatment of depression and anxiety. It belongs to a class of drugs known as selective serotonin reuptake inhibitors (SSRIs). It works by increasing the levels of serotonin in the brain which is an important chemical for improving mood and emotions. (1)

It is important to remember that, tachycardia associated with Paxil may vary from person to person. Your doctor will consider your individual medical history and specific situation before prescribing the medication.

What does research suggest?

Research and clinical studies have indeed reported that Paxil (paroxetine) can cause an increase in heart rate called tachycardia, as a potential side effect in some individuals. Tachycardia means that your heart is beating faster than it should. (2)

Not everyone who takes Paxil will experience this side effect but it has been documented in some cases. The exact mechanism is not fully understood, changes in serotonin levels can have an impact on the heart rate.

If you are concerned about this potential side effect or if you experience symptoms like rapid or irregular heartbeat while taking Paxil, it is important to consult with your healthcare provider. 

What is tachycardia and its implications on the heart rate?

Tachycardia refers to the condition when your heartbeat is faster than it should be. Normally, your heart beats between 60-100 times per minute when you are at rest. It can vary in severity and can be characterised by different heart rates. (3)

The implications of tachycardia on the heart rate depend on the underlying condition and how long will it last. Some types of tachycardia are not a big concern and may go away on their own, while others can be serious and need medical attention. Here’s what might happen with severe and prolonged tachycardia:

Feeling dizzy and tired:

If your heart beats too quickly, it may not fill with enough blood so it can’t pump blood effectively to the rest of your body. This can make you feel dizzy, short of breath and tired.

Risk of blood clots:

Some types of tachycardia, like atrial fibrillation, can increase the chance of blood clots forming in your heart. These clots can travel to other parts of your body and cause stroke.

Worsening heart problems:

If you already have heart issues, tachycardia can make them worse, leading to chest pain (angina) or heart failure.

Sudden cardiac arrest:

In extreme cases, a specific type of tachycardia called Ventricular tachycardia can lead to a life-threatening heart rhythm called ventricular fibrillation. This can cause sudden cardiac arrest, which is very dangerous. (3)

The impact of tachycardia on your health can vary widely, so if you experience any symptoms or have concerns relating to your heart, it’s essential to consult with a healthcare provider for a proper evaluation, diagnosis and treatment plan.  

What is the link between Paxil and tachycardia?

The link between Paxil (paroxetine) and tachycardia ( an abnormally fast heart rate) is that tachycardia can be a potential side effect of this medication. It means that in some cases, people who take Paxil may experience a faster heart rate than what is considered normal. (4)

The exact mechanism by which Paxil can lead to tachycardia is not fully understood, but it may be related to how Paxil affects the balance of certain chemicals in the brain and its influence on the autonomic nervous system, which controls the heart rate.

It’s important to note that, not everyone taking Paxil will experience this side effect and the likelihood of tachycardia varies from person to person. So, if you are taking Paxil and you are concerned about the changes in your heart rate it’s essential to consult with your healthcare provider. 

What factors could contribute to tachycardia while taking Paxil?

Several factors can make your heart beat faster (tachycardia) when you are taking Paxil. Some of them include: (2,3)

  • Individual variability: People can react differently to medications. What affects one person’s heart rate might not affect another’s. 
  • Dosage: The amount of Paxil you take can make a difference. Higher doses are more likely to speed up your heart rate.
  • Duration of use: Tachycardia may be more common when a person first starts taking Paxil or when your doctor changes your dose. It could be temporary and get better as your body gets used to the medication. 
  • Other medications: If you are taking other medications along with Paxil, they might interact and affect your heart rate. So, your doctor must know about all the medications that you are taking. 
  • Underlying medical conditions: If you have pre-existing heart problems or other medical conditions, Paxil could increase the chances of tachycardia. 
  • Age: Older people may be more sensitive to the effects of Paxil, which can increase the risk of tachycardia and other potential side effects. 

What you should do if you experience Paxil-induced tachycardia?

If you suspect that you are experiencing tachycardia (a rapid heart rate) as a side effect of  taking Paxil, it is important to take the following steps: (3,4)

Contact your healthcare provider: The first and most crucial step is to get in touch with your healthcare provider. They are the best person to assess your situation and determine the appropriate course of action.

Do not stop medication abruptly: Do not suddenly stop taking Paxil by yourself. Your doctor will advise you on how to adjust your medication if needed.

Medical evaluation: Your doctor will conduct a thorough evaluation which may include a physical examination, tests and discussions about your symptoms and medical history.

Medication adjustment: Depending on how serious the tachycardia is, your doctor might change your Paxil dose or switch to a different medication that suits you better.

Lifestyle changes: Your doctor may recommend you to adopt healthy lifestyle habits like, stress reduction techniques, healthy dietary intake and adequate sleep. 

Working closely with your healthcare provider is essential, to manage any issues related to your medication and your health. Always follow their advice and keep them updated on any concerns or side effects you experience.

What are the additional side effects of Paxil?

Some common side effects of Paxil are: (5)

  • Nausea
  • Drowsiness
  • Weight changes (weight gain or weight loss)
  • Sexual dysfunction
  • Dry mouth
  • Dizziness
  • Sweating ( excessive sweating, often at night)
  • Constipation or diarrhoea
  • Restlessness or nervousness
  • Sleep disturbances
  • Headache
  • Tremors
  • Increased anxiety
  • Suicidal thoughts
  • Serotonin syndrome

These side effects can vary in intensity and duration, and not everyone will experience all of them. It’s important to discuss any concerns or side effects with your healthcare provider.


In this article, we have discussed the effect of Paxil on heart rate. We have also discussed tachycardia and its impacts on our overall health and treatment strategies to prevent it.

In my opinion, it’s crucial to consult your healthcare provider before starting Paxil or any other medication. They can provide you with personalized guidance and prepare a treatment plan for you, according to your specific situation.

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