Key takeaways<\/h2>\n\n- \n
Flecainide is used to treat or prevent serious heart rhythm problems but can cause severe side effects including new or worsened arrhythmias, heart failure, and an increased risk of death after a heart attack.<\/p>\n<\/li>\n
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Common side effects of flecainide include dizziness, visual impairment, trouble breathing, headaches, nausea, fatigue, and others, with serious heart-related side effects being potentially life-threatening.<\/p>\n<\/li>\n
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Flecainide carries a black box warning due to its potential to increase the risk of death or nonfatal cardiac arrest in certain patients, emphasizing the importance of careful patient selection and monitoring.<\/p>\n<\/li>\n
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To avoid flecainide side effects, patients are advised to follow their prescription carefully, avoid drug interactions, and attend regular follow-up visits for monitoring by healthcare professionals.<\/p>\n<\/li>\n<\/ul>\n<\/div>\n<\/div>\n
Common flecainide side effects<\/a> | Serious side effects<\/a> | Irregular heartbeat<\/a> | Heart failure<\/a> | Increased risk of fatal heart attack<\/a> |\u00a0 Side effects timeline<\/a>\u00a0| Contraindications<\/a> | Warnings<\/a> | Interactions<\/a> | How to avoid side effects<\/a> | How to treat side effects<\/a><\/span><\/p>\nFlecainide<\/span> is a generic prescription drug used to treat or prevent serious and life-threatening heartbeat abnormalities. These abnormalities include chaotic, fast heartbeats of the upper chambers of the heart (paroxysmal <\/span>atrial fibrillation<\/span> and atrial flutter) and fast or irregular heartbeats of the lower chambers (ventricular tachycardia and other ventricular arrhythmias). As an <\/span>antiarrhythmic<\/span>, flecainide slows and stabilizes heartbeats by weakening nerve activity.\u00a0<\/span><\/p>\nAlthough it is an effective drug, flecainide can cause side effects, some of which can be severe. Because of the possibility of severe side effects on the heart, flecainide should only be reserved for serious heart rhythm problems.\u00a0<\/span><\/p>\nCommon side effects of flecainide<\/span><\/h2>\nFlecainide can cause various side effects, including side effects on the heart, lungs, and digestive system. Consult a healthcare provider if you experience any side effects or if side effects persist or worsen. The most common side effects of flecainide include:<\/span><\/p>\n\n- Dizziness, lightheadedness, feeling faint, or unsteadiness<\/span><\/li>\n
- Visual impairment, such as blurred vision and seeing spots<\/span><\/li>\n
- Trouble breathing<\/span><\/li>\n
- Headache<\/span><\/li>\n
- Nausea<\/span><\/li>\n
- Fatigue<\/span><\/li>\n
- Palpitations<\/span><\/li>\n
- Chest pain<\/span><\/li>\n
- Weakness<\/span><\/li>\n
- Tremor<\/span><\/li>\n
- Constipation<\/span><\/li>\n
- Fluid retention and swelling<\/span><\/li>\n
- Abdominal pain<\/span><\/li>\n<\/ul>\n
Serious side effects of flecainide<\/span><\/h2>\nSome of the <\/span>most serious side effects of flecainide<\/span><\/a> include:<\/span><\/p>\n\n- New or worsened arrhythmias<\/span><\/li>\n
- Heart block<\/span><\/li>\n
- Heart failure<\/span><\/li>\n
- Cardiac arrest<\/span><\/li>\n
- Liver problems, such as liver damage or liver failure<\/span><\/li>\n
- Low blood cell counts<\/span><\/li>\n
- Lung problems<\/span><\/li>\n
- Allergic reactions<\/span><\/li>\n<\/ul>\n
Flecainide and irregular heartbeats<\/span><\/h3>\nOne important thing to know is that flecainide, an antiarrhythmic, can have proarrhythmic effects. That is, flecainide can cause arrhythmias or irregular heartbeats even though it\u2019s prescribed to treat irregular heartbeats. In some people, the drug may cause worsened or new irregular heartbeats, which can be life-threatening. Heart rhythm changes can include PR, QRS, and QT prolongation.\u00a0<\/span><\/p>\nThe incidence of new or worsened arrhythmias in clinical trials ranges from <\/span>1% to 7%<\/span><\/a> of patients, depending on the underlying condition being treated. About 80% of heart rhythm problems occur in the first two weeks of treatment for a certain type of ventricular arrhythmia. To prevent serious problems, healthcare professionals typically start flecainide treatment in a hospital where they can monitor the heart and intervene if there\u2019s trouble. People who take flecainide at home are recommended to keep up with regular office visits to monitor heart rate and heart rhythm.\u00a0<\/span><\/p>\nFlecainide and heart failure<\/span><\/h3>\nThe use of flecainide also carries a risk of new or worsened <\/span>heart failure<\/span>, a condition in which the heart cannot pump enough blood to the body. Heart failure is not uncommon in people with arrhythmias. In clinical trials, the incidence of new or worsened heart failure ranges from <\/span>0.4% to 26%<\/span><\/a> of participants, depending on the heart condition being treated and whether the patient has pre-existing heart failure. It is important for people taking flecainide to be familiar with the symptoms of heart failure and immediately report them to the prescriber or other healthcare professional.<\/span><\/p>\nIncreased risk of death after a heart attack<\/span><\/h3>\nAccording to results from the National Heart Lung and Blood Institute\u2019s Cardiac Arrhythmia Suppression Trial (CAST), the use of flecainide may cause an increased risk of death or cardiac arrest in certain patients. An increased risk of death was observed in patients who experienced a recent heart attack. Consult a healthcare provider for appropriate treatment options before taking flecainide after a recent heart attack.\u00a0<\/span><\/p>\nHow soon do flecainide side effects start?<\/span><\/h2>\nFlecainide begins affecting the heart after the very first dose. Many of flecainide\u2019s most common side effects, such as dizziness, headache, fatigue, stomach pain, and tremor, occur early in treatment. Heart rhythm problems have mostly occurred during the first two weeks of treatment for sustained ventricular tachycardia. However, rapid or slow heartbeats may occur after taking the first dose. Other serious side effects, including liver problems, lung problems, and blood cell problems, may develop within a few days, a few weeks, or longer.<\/span><\/p>\nHow long do flecainide side effects last?<\/span><\/h2>\nMild side effects generally subside over time as the body gets used to the medication. Those that don\u2019t typically resolve once the medicine is stopped. However, flecainide is often taken with other heart medicines. Some of the problems caused by flecainide may persist while continuing or switching to similar medications. Heart problems may require that flecainide be stopped.<\/span><\/p>\nWhat are the long-term side effects of flecainide?<\/span><\/h2>\nFlecainide treatment is usually long-term and can last for months. While flecainide is not linked to serious long-term side effects, worsening heart failure symptoms, for example, may be more likely to develop in people with pre-existing heart failure. <\/span>Some clinical studies<\/span><\/a> have suggested that long-term use may cause various types of lung diseases, including inflammation in the lungs (pneumonitis) and scarring (fibrosis). However, <\/span>other clinical studies<\/span><\/a> have found that lung problems can start early in flecainide treatment.<\/span><\/p>\n\t\t<\/p>\n
Flecainide is used to treat or prevent serious heart rhythm problems but can cause severe side effects including new or worsened arrhythmias, heart failure, and an increased risk of death after a heart attack.<\/p>\n<\/li>\n
Common side effects of flecainide include dizziness, visual impairment, trouble breathing, headaches, nausea, fatigue, and others, with serious heart-related side effects being potentially life-threatening.<\/p>\n<\/li>\n
Flecainide carries a black box warning due to its potential to increase the risk of death or nonfatal cardiac arrest in certain patients, emphasizing the importance of careful patient selection and monitoring.<\/p>\n<\/li>\n
To avoid flecainide side effects, patients are advised to follow their prescription carefully, avoid drug interactions, and attend regular follow-up visits for monitoring by healthcare professionals.<\/p>\n<\/li>\n<\/ul>\n<\/div>\n<\/div>\n
Common flecainide side effects<\/a> | Serious side effects<\/a> | Irregular heartbeat<\/a> | Heart failure<\/a> | Increased risk of fatal heart attack<\/a> |\u00a0 Side effects timeline<\/a>\u00a0| Contraindications<\/a> | Warnings<\/a> | Interactions<\/a> | How to avoid side effects<\/a> | How to treat side effects<\/a><\/span><\/p>\n Flecainide<\/span> is a generic prescription drug used to treat or prevent serious and life-threatening heartbeat abnormalities. These abnormalities include chaotic, fast heartbeats of the upper chambers of the heart (paroxysmal <\/span>atrial fibrillation<\/span> and atrial flutter) and fast or irregular heartbeats of the lower chambers (ventricular tachycardia and other ventricular arrhythmias). As an <\/span>antiarrhythmic<\/span>, flecainide slows and stabilizes heartbeats by weakening nerve activity.\u00a0<\/span><\/p>\n Although it is an effective drug, flecainide can cause side effects, some of which can be severe. Because of the possibility of severe side effects on the heart, flecainide should only be reserved for serious heart rhythm problems.\u00a0<\/span><\/p>\n Flecainide can cause various side effects, including side effects on the heart, lungs, and digestive system. Consult a healthcare provider if you experience any side effects or if side effects persist or worsen. The most common side effects of flecainide include:<\/span><\/p>\n Some of the <\/span>most serious side effects of flecainide<\/span><\/a> include:<\/span><\/p>\n One important thing to know is that flecainide, an antiarrhythmic, can have proarrhythmic effects. That is, flecainide can cause arrhythmias or irregular heartbeats even though it\u2019s prescribed to treat irregular heartbeats. In some people, the drug may cause worsened or new irregular heartbeats, which can be life-threatening. Heart rhythm changes can include PR, QRS, and QT prolongation.\u00a0<\/span><\/p>\n The incidence of new or worsened arrhythmias in clinical trials ranges from <\/span>1% to 7%<\/span><\/a> of patients, depending on the underlying condition being treated. About 80% of heart rhythm problems occur in the first two weeks of treatment for a certain type of ventricular arrhythmia. To prevent serious problems, healthcare professionals typically start flecainide treatment in a hospital where they can monitor the heart and intervene if there\u2019s trouble. People who take flecainide at home are recommended to keep up with regular office visits to monitor heart rate and heart rhythm.\u00a0<\/span><\/p>\n The use of flecainide also carries a risk of new or worsened <\/span>heart failure<\/span>, a condition in which the heart cannot pump enough blood to the body. Heart failure is not uncommon in people with arrhythmias. In clinical trials, the incidence of new or worsened heart failure ranges from <\/span>0.4% to 26%<\/span><\/a> of participants, depending on the heart condition being treated and whether the patient has pre-existing heart failure. It is important for people taking flecainide to be familiar with the symptoms of heart failure and immediately report them to the prescriber or other healthcare professional.<\/span><\/p>\n According to results from the National Heart Lung and Blood Institute\u2019s Cardiac Arrhythmia Suppression Trial (CAST), the use of flecainide may cause an increased risk of death or cardiac arrest in certain patients. An increased risk of death was observed in patients who experienced a recent heart attack. Consult a healthcare provider for appropriate treatment options before taking flecainide after a recent heart attack.\u00a0<\/span><\/p>\n Flecainide begins affecting the heart after the very first dose. Many of flecainide\u2019s most common side effects, such as dizziness, headache, fatigue, stomach pain, and tremor, occur early in treatment. Heart rhythm problems have mostly occurred during the first two weeks of treatment for sustained ventricular tachycardia. However, rapid or slow heartbeats may occur after taking the first dose. Other serious side effects, including liver problems, lung problems, and blood cell problems, may develop within a few days, a few weeks, or longer.<\/span><\/p>\n Mild side effects generally subside over time as the body gets used to the medication. Those that don\u2019t typically resolve once the medicine is stopped. However, flecainide is often taken with other heart medicines. Some of the problems caused by flecainide may persist while continuing or switching to similar medications. Heart problems may require that flecainide be stopped.<\/span><\/p>\n Flecainide treatment is usually long-term and can last for months. While flecainide is not linked to serious long-term side effects, worsening heart failure symptoms, for example, may be more likely to develop in people with pre-existing heart failure. <\/span>Some clinical studies<\/span><\/a> have suggested that long-term use may cause various types of lung diseases, including inflammation in the lungs (pneumonitis) and scarring (fibrosis). However, <\/span>other clinical studies<\/span><\/a> have found that lung problems can start early in flecainide treatment.<\/span><\/p>\n \t\t<\/p>\nCommon side effects of flecainide<\/span><\/h2>\n
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Serious side effects of flecainide<\/span><\/h2>\n
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Flecainide and irregular heartbeats<\/span><\/h3>\n
Flecainide and heart failure<\/span><\/h3>\n
Increased risk of death after a heart attack<\/span><\/h3>\n
How soon do flecainide side effects start?<\/span><\/h2>\n
How long do flecainide side effects last?<\/span><\/h2>\n
What are the long-term side effects of flecainide?<\/span><\/h2>\n