A sudden thud in your chest. A fluttering that feels like a trapped bird. A heartbeat so loud you can hear it in your ears as you lie in bed. Palpitations are unsettling at the best of times, and when they start while you’re taking a strong pain medicine like oxycodone, it’s natural to worry that something is wrong with your heart.
Palpitations are listed as an uncommon adverse reaction to oxycodone, reported in up to about 3% of people in the PDR drug summary for OxyContin. Opioids more often slow the heart slightly than speed it up, so when palpitations happen, there is usually an identifiable trigger. This article helps you find that trigger, shows you how to check your pulse properly, explains one important drug interaction, and makes clear when to get help. For an overview of how oxycodone affects heart rate in general, see oxycodone and heart rate.
What Palpitations Feel Like
“Palpitations” simply means being unusually aware of your own heartbeat. People describe them in different ways, and the description can hint at the cause:
- Pounding: a strong, forceful beat, often during anxiety, after caffeine, or when lying on your left side.
- Racing: a fast, regular heartbeat, common with withdrawal, dehydration, low blood pressure or fever.
- Fluttering: a rapid, shallow, quivering sensation.
- Skipping or flip-flopping: a pause followed by a strong beat. These are usually harmless extra beats (ectopic beats), but they become more noticeable when you’re anxious or tired.
- Irregular: a beat that feels chaotic with no steady rhythm, which needs medical assessment because it may be atrial fibrillation.
Trigger Finder: What’s Behind Your Palpitations?
Use this table to match your situation to the most likely cause.
| If your palpitations… | Possible cause | Next step |
|---|---|---|
| Start as a dose wears off, with sweating, yawning or restlessness | End-of-dose withdrawal | Discuss timing or formulation with your prescriber |
| Begin a day or two after missing, reducing or stopping doses | Withdrawal | Contact your prescriber; see the withdrawal guide |
| Come on when you stand up, with light-headedness | Low blood pressure; the heart speeds up to compensate | Rise slowly, stay hydrated, tell your doctor |
| Started after adding an antidepressant, triptan or other serotonin-affecting medicine | Possible serotonin syndrome | Seek urgent advice, especially with other symptoms (see below) |
| Follow coffee, energy drinks, decongestants or nicotine | Stimulant effect | Cut back and see if they settle |
| Come with worry, racing thoughts or a sense of dread | Anxiety or panic | Breathing techniques; talk to your doctor about anxiety |
| Occur with fever, sweats or feeling generally unwell | Infection or dehydration | Check temperature, drink fluids, see a doctor |
Withdrawal and wearing-off
When you’ve taken oxycodone regularly, your body adjusts to it. As the level falls, the nervous system can swing into an overactive state, raising heart rate and blood pressure. This is one of the most common reasons for palpitations in people taking oxycodone, and it often follows a predictable pattern before each dose. See early signs of oxycodone withdrawal and oxycodone withdrawal and anxiety.
Low blood pressure
Oxycodone can lower blood pressure, particularly when you go from lying or sitting to standing. To keep blood flowing to the brain, the heart beats faster, which you may feel as a racing pulse. See can oxycodone lower blood pressure.
Caffeine and other stimulants
Many people drink extra coffee to counter oxycodone drowsiness. Combined with decongestant cold remedies or nicotine, this can easily trigger palpitations. Read drinking coffee with oxycodone and allergy medicine with oxycodone.
Anxiety
Living with pain, worrying about a medicine’s risks, and poor sleep all raise anxiety, and anxiety makes the heartbeat more noticeable. See can oxycodone cause anxiety.
The Interaction to Know About: Serotonin Syndrome
Serotonin syndrome is a rare but potentially serious reaction that can happen when oxycodone is taken with medicines that increase serotonin in the brain. A fast heartbeat is one of its features. Medicines that can contribute include:
- SSRI antidepressants, such as sertraline, fluoxetine, citalopram and escitalopram
- SNRI antidepressants, such as duloxetine and venlafaxine
- Tricyclic antidepressants and MAO inhibitors
- Triptans for migraine
- Some other pain medicines, such as tramadol
- Certain anti-nausea medicines and the antibiotic linezolid
- Supplements such as St John’s wort
Taking these together isn’t automatically unsafe; many people do so under medical supervision. The key is knowing the warning signs, which usually appear within hours of starting or increasing one of the medicines:
- Fast heartbeat and high blood pressure
- Agitation, restlessness or confusion
- Heavy sweating, shivering or goosebumps
- Muscle twitching, jerking or stiffness, and overactive reflexes
- Diarrhea
- High fever
If you develop several of these together, seek emergency care. Our article on oxycodone and antidepressants explains this interaction in detail.
How to Check Your Pulse During Palpitations
Recording what your heart is doing during an episode is enormously helpful to a doctor. Here’s how:
- Sit down and rest for a moment.
- Place two fingers (not your thumb) on the inside of your wrist, just below the base of your thumb.
- Count the beats for 30 seconds and double the number to get beats per minute.
- Notice whether the rhythm is steady, like a clock, or irregular.
- Write down the time, your pulse, the rhythm, what you were doing, and when you last took oxycodone.
A smartwatch or home blood pressure monitor can record your heart rate, and some watches can also take a simple ECG tracing. These are useful but not a substitute for a medical assessment. A typical resting heart rate in adults is between 60 and 100 beats per minute.
What Your Doctor May Do
If you report palpitations, your doctor will usually:
- Ask about the pattern, timing relative to your doses, and every medicine and supplement you take
- Check your pulse, blood pressure (lying and standing) and oxygen level
- Arrange an ECG (a tracing of the heart’s electrical activity)
- Order blood tests for anemia, thyroid function and salts such as potassium
- Possibly suggest a wearable monitor that records your heart rhythm over a day or longer
Oxycodone is not generally known for disturbing heart rhythm in the way some other opioids can. Methadone, for example, is known to affect the heart’s electrical activity. See oxycodone vs methadone. Our guide on how to talk to your doctor about oxycodone can help you prepare.
Calming an Episode at Home
For brief, mild palpitations with no warning signs, these steps often help:
- Sit or lie down and breathe slowly: in for four counts, hold for a moment, out for six.
- Drink a glass of water, especially if you’ve been sweating.
- Stop any caffeine or nicotine for the rest of the day.
- Avoid lying on your left side if that makes your heartbeat more noticeable.
- Don’t take an extra oxycodone dose to calm withdrawal-type symptoms. Talk to your prescriber instead.
When to Call Emergency Services
Get emergency help straight away if palpitations come with:
- Chest pain, pressure or tightness. See oxycodone and chest tightness.
- Fainting or nearly fainting
- Severe shortness of breath. See can oxycodone cause shortness of breath.
- A heart rate that stays above about 120–150 beats per minute at rest, or a very irregular rhythm
- Confusion, high fever, muscle stiffness or twitching (possible serotonin syndrome)
- Slow or shallow breathing or extreme drowsiness (possible overdose)
If you have known heart disease, report any new palpitations to your doctor promptly, even if they seem mild.
Frequently Asked Questions
Can oxycodone cause a racing heart?
Oxycodone more commonly slows the heart slightly. A racing heart is more often caused by withdrawal, low blood pressure, stimulants, anxiety, infection or a drug interaction.
Why do I get palpitations at night on oxycodone?
At night, you’re lying still in a quiet room, so you notice your heartbeat more. Doses wearing off overnight can also trigger withdrawal-related palpitations. See taking oxycodone at night.
Can I take a beta-blocker with oxycodone?
Many people take both, but the combination can lower blood pressure further. Only take one if prescribed, and see blood pressure medicine with oxycodone.
Will palpitations stop if I stop oxycodone?
If they’re caused by low blood pressure from oxycodone, they should improve. But stopping suddenly can trigger withdrawal, which itself causes palpitations. Any change should be planned with your prescriber.
The Bottom Line
Palpitations are an uncommon oxycodone side effect, and they usually have a specific trigger: wearing-off or withdrawal, low blood pressure, stimulants, anxiety, infection, or a serotonin-related drug interaction. Note when they happen relative to your doses, check your pulse and rhythm, and share the details with your doctor. Never ignore palpitations with chest pain, fainting, breathlessness or confusion. For related effects, see our guide to uncommon oxycodone side effects.
Medical disclaimer: This article is for general education and does not replace advice from your doctor, pharmacist or other qualified health professional. Do not start, stop or change any medicine without speaking to your prescriber.