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Flecainide is a prescription antiarrhythmic medication used to treat paroxysmal supraventricular tachycardia (PSVT), a potentially life-threatening irregular heartbeat. While it is an effective drug, it can cause various side effects, including muscle pain or myalgia, which is considered a rare adverse reaction. Other common side effects include dizziness, lightheadedness, visual impairment, nausea, fatigue, and chest pain. In rare cases, it can also cause serious heart problems, especially in patients with pre-existing heart conditions. Due to the potential for severe side effects, it is crucial to consult a healthcare provider before taking flecainide and to carefully follow the prescription instructions.
| Characteristics | Values |
|---|---|
| Muscle Aches | Neuromuscular adverse effects of flecainide include muscle pain or sensory neuropathy. Myalgias are a rare adverse effect that should be considered in patients prescribed flecainide. |
| Cause of Muscle Aches | Increasing flecainide dosages caused more myalgias, especially in patients taking 300 mg/day. |
| Treatment | In most cases, symptoms disappeared once therapy was discontinued or switched. A patient had improvement in symptoms within 24 hours of discontinuation of the therapy. |
| Precautions | Healthcare providers should be aware of flecainide’s rare, reversible neurological adverse effect profile, as this may prevent extensive and potentially invasive inflammatory, infectious or neuromuscular disease investigations. |
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What You'll Learn
Muscle pain and myalgia
Myalgia is the medical term for muscle pain. It is usually temporary and not serious, but sometimes it can be a sign of a long-term condition that needs attention. Myalgia can be classified as either localized (in one spot) or diffuse (all over). Localized muscle pain or soreness in one spot is often related to an injury or recent stress on that muscle group. On the other hand, diffuse, all-over body aches are more likely to be related to something affecting your whole body, like a disease.
The most common causes of myalgia are overuse, injury, and strain. Muscle pain can also be caused by dehydration, especially for people involved in extensive physical activity. Other common causes include viral infections, metabolic myopathy, nutritional deficiencies, fibromyalgia, and amplified musculoskeletal pain syndrome. Myalgia might also be caused by allergies, medications, or as a response to a vaccination.
Flecainide is a class 1C antiarrhythmic drug that is used to prevent paroxysmal atrial fibrillation, ventricular arrhythmia, and paroxysmal supraventricular tachycardia. It has been known to cause several cardiac and non-cardiac adverse reactions. While rare, myalgia is one of the adverse reactions that have been observed in patients taking flecainide. In most cases, symptoms disappeared once the medication was discontinued or switched.
If you are experiencing muscle pain, it is important to take it seriously and seek medical attention if it does not improve with home care.
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Rare adverse reaction
Flecainide is an antiarrhythmic medication that treats paroxysmal supraventricular tachycardia (PSVT), a potentially life-threatening irregular heartbeat. It is known to cause several cardiac and non-cardiac adverse reactions.
One rare adverse reaction to the drug is myalgia, or muscle pain, and weakness. A Naranjo probability score of 7 suggested flecainide as the probable cause of myalgias in a 62-year-old woman with atrial fibrillation. The patient's symptoms started to normalise within 24 hours of discontinuing the medication. Increasing flecainide dosages were also found to cause more myalgias, especially in patients taking 300 mg/day.
Other neuromuscular adverse effects of flecainide include sensory neuropathy. Electromyographic studies and nerve biopsies can be considered for diagnosis, but they provide non-specific findings of nerve damage.
Flecainide may also cause or exacerbate arrhythmias in 1% of patients with pre-existing paroxysmal supraventricular tachycardia and in 7% of patients with paroxysmal atrial fibrillation. In some people, the drug may cause worsened or new irregular heartbeats, which can be life-threatening.
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Dose-dependent effects
Flecainide is an anti-arrhythmic medication that treats paroxysmal supraventricular tachycardia (PSVT), a potentially life-threatening irregular heartbeat. It works by blocking specific electrical signals in the heart that cause an irregular heartbeat.
Flecainide has a dose-dependent effect on preventing arrhythmias. However, its adverse effects, including myalgias, are also dose-dependent. Increasing the dosage of flecainide can cause more myalgias, especially in patients taking 300 mg/day. In most cases, symptoms disappear once the medication is discontinued or switched.
A Naranjo score of 7 or higher suggests a probable link between flecainide and myalgias. The Collaborative Group for the Study of Polyneuropathy found that out of 20 subjects on flecainide, one had clinical polyneuropathy and five had electrophysiological polyneuropathy. Other neuromuscular adverse effects of flecainide include muscle pain or sensory neuropathy.
It is important to note that side effects of flecainide can vary depending on the individual. Patients taking flecainide should be closely monitored for problems with the heart, liver, and kidneys. A detailed medication history is crucial in evaluating any adverse effects. Early discontinuation of flecainide can resolve myalgias and prevent long-term complications.
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Potential drug interactions
While muscle pain is a rare adverse effect of taking flecainide, the drug can cause several other side effects, including cardiac and non-cardiac complications. It is important to consult a healthcare provider before taking flecainide, especially if you have other medical conditions, particularly heart conditions.
- Beta-blockers: Using beta-blockers such as propranolol (Ineral LA) with flecainide can increase the levels of both medications in the body. However, this combination does not increase the risk of side effects from either medication.
- Digoxin: Flecainide increases the levels of digoxin in the body, but it does not increase the risk of side effects.
- Other antiarrhythmic medications: As flecainide is an antiarrhythmic drug, taking it with other medications in the same class, such as propafenone or quinidine, may lead to an increased risk of side effects or potential drug interactions.
- Herbal supplements and vitamins: It is important to consult a healthcare provider before taking any herbal supplements or vitamins concurrently with flecainide, as they may interact with the medication and impact its effectiveness.
- Over-the-counter medications: Over-the-counter medications should also be discussed with a doctor before taking them with flecainide to avoid potential drug interactions.
Additionally, it is important to note that the side effects of flecainide can vary depending on the individual. Some of the more common side effects include dizziness, lightheadedness, visual impairment, tremors, headaches, nausea, fatigue, and stomach problems. However, more severe side effects may occur, including abnormal heart rhythms, heart failure, and an increased risk of death after a heart attack. Therefore, it is crucial to closely monitor patients taking flecainide and report any new or worsening symptoms to a healthcare provider.
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Cardiac and non-cardiac effects
Flecainide is a class 1C antiarrhythmic drug that works by blocking specific electrical signals in the heart that cause an irregular heartbeat. It is used to treat or prevent serious heart rhythm problems. However, it can also cause cardiac and non-cardiac adverse reactions.
Cardiac Effects
Flecainide can cause or worsen arrhythmias, which are irregular heartbeats. This can include sinus bradycardia or arrest, bundle branch blocks, increased premature ventricular contractions, ventricular tachycardia or fibrillation, and even sudden death. In patients with preexisting paroxysmal supraventricular tachycardia, flecainide may cause or exacerbate arrhythmias in 1% of cases. This number increases to 7% in patients with paroxysmal atrial fibrillation and 7%-13% in patients with preexisting sustained or nonsustained ventricular arrhythmias. New ventricular arrhythmias have been reported in 3.4% of patients. Additionally, flecainide can cause prolongation of the PR, QRS, and corrected QT intervals, which can lead to heart failure. Other cardiac side effects include chest pain, shortness of breath, and swelling of the hands, ankles, or feet. These symptoms may indicate heart failure or other serious conditions.
Non-Cardiac Effects
Flecainide can also cause non-cardiac side effects, such as dizziness, lightheadedness, feeling faint, or unsteadiness. It may also lead to visual impairment, blurred vision, or seeing spots. Other non-cardiac effects include constipation, stomach pain, tremors (shaking), cough, extreme fatigue, headache, nausea, weight gain, and allergic reactions such as itchy skin or swelling of the face, lips, tongue, or throat. It is important to note that increasing the dosage of flecainide can increase the incidence and severity of these side effects.
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Frequently asked questions
Flecainide is a prescription antiarrhythmic medication. It treats paroxysmal supraventricular tachycardia (PSVT), a potentially life-threatening irregular heartbeat.
Yes, muscle pain is a rare adverse effect of taking flecainide. Other neuromuscular adverse effects include sensory neuropathy and weakness.
If you experience any side effects, consult a healthcare provider. In most cases, symptoms disappear once therapy is discontinued or switched.
