Can I take Flecainide and Wegovy together?

You should speak to your doctor before taking these two medicines together. Wegovy slows stomach emptying, which can affect how quickly Flecainide is absorbed.

Why this happens

Wegovy is a GLP-1 receptor agonist that delays gastric emptying (the time it takes for food and pills to leave the stomach). This can delay or alter the absorption of oral medications like flecainide.

Furthermore, Wegovy can sometimes increase resting heart rate, which may interact with the heart rhythm effects of flecainide.

What you should do

• Speak to your doctor before taking Flecainide and Wegovy together.

• Your doctor may recommend more frequent ECGs (heart traces) or blood tests when starting or changing your Wegovy dose.

• Contact your doctor immediately if you:

  • Feel dizzy.

  • Faint.

  • Notice any change in your heartbeat.

Important precautions

Heart failure or previous heart attack

Flecainide must not be used if you have heart failure or have previously suffered a heart attack, as it can increase the risk of life-threatening heart rhythm problems.

Permanent atrial fibrillation

Flecainide should not be used if you have long-standing (permanent) atrial fibrillation that has not been corrected, as it can paradoxically cause the heart rate to become dangerously fast.

Mental health changes - Wegovy

You must monitor your mood and tell your doctor immediately if you experience any sudden changes in mental health, including thoughts of suicide or self-harm.

Pancreatitis

Stop using Wegovy and seek immediate medical help if you experience severe and persistent stomach pain, which may reach through to your back, as this can be a sign of acute pancreatitis.

Gallbladder problems

Wegovy can cause gallstones or gallbladder inflammation. Report any sudden, severe pain in your upper right abdomen, yellowing of the skin or eyes (jaundice), or fever to your doctor.

Dehydration - Wegovy

Side effects of Wegovy including nausea and vomiting can cause dehydration. Ensure you drink plenty of fluids to avoid kidney problems, especially when starting treatment or increasing your dose.

Food and drink warnings

Alcohol

It is best to avoid or strictly limit alcohol while taking flecainide. Alcohol can interfere with your heart rhythm and may increase the risk of side effects such as dizziness or blurred vision. Combining alcohol with heart medication can also put extra strain on your heart and liver.

It is best to avoid or strictly limit alcohol while taking Wegovy. Both alcohol and Wegovy can lower your blood sugar levels; combining them increases the risk of severe hypoglycaemia (dangerously low blood sugar). Additionally, alcohol can worsen common Wegovy side effects like nausea, vomiting, and dehydration.

Caffeine (coffee, tea, energy drinks, cola)

Caffeine is a stimulant that can increase your heart rate or cause irregular heart rhythms. Since flecainide is used to treat heart rhythm problems (arrhythmias), consuming high amounts of caffeine may counteract the effects of your medicine or make your condition worse. It is best to limit your intake of caffeine.

Dairy products (milk)

In some cases, particularly in children or patients on a milk-based diet, high intake of milk can affect how flecainide is absorbed. However, for most adults, normal amounts of dairy are fine. If you are making a significant change to your dairy intake, discuss this with your doctor.

Low-salt (low-sodium) diets

A sudden change to a very low-salt diet or using salt substitutes can increase the levels of flecainide in your blood, which may lead to toxicity. Do not make major changes to your salt intake without consulting your doctor.

Large or high-fat meals

Wegovy slows down how quickly your stomach empties. Eating very large meals or foods high in fat can lead to severe nausea, bloating, and discomfort. It is recommended to eat smaller portions and stop eating as soon as you feel full.

Using other medicines

Taking multiple medicines? Our Medicines Interaction Checker helps you check whether your prescriptions, over-the-counter medicines, and supplements are safe to take together. Simply search for your medicines to see potential interactions and what to do about them.

Disclaimer

This information is for general educational purposes only and should not be relied upon as a substitute for professional medical advice. Always consult your GP, pharmacist, or another qualified healthcare professional before making decisions about your medications. Individual circumstances may vary, and only a healthcare professional who knows your medical history can provide personalised guidance.