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Fatigue (6)
Anxiety (3)
Nausea (2)
Neuropothy (1)
Pulmonary Hypertension (1)
Stomach Pain (1)
Suicide (1)
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Flecainide Side Effects and Adverse Effects reported to US Food and Drug Administration (FDA)

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Showing 1-25 of 361 

Hypoaesthesia, Dizziness, Paraesthesia, Hyperhidrosis, Chest Discomfort, Headache (8286355-9)
on Apr 11, 2012 Female from UNITED STATES , 76 years of age, weighting 155.0 lb, was diagnosed with
  • atrial fibrillation
and was treated with Flecainide Acetate. Directly after, patient experienced the unwanted or unexpected Flecainide side effects: hypoaesthesia, dizziness, paraesthesia, hyperhidrosis, chest discomfort, headache. Flecainide Acetate dosage: 50 Mg 1every 12 Hours Oral. Patient was hospitalized.

Pain (8261784-8)
Patient was taking Flecainide Acetate. Patient felt the following Flecainide side effects: pain on Mar 29, 2012 from UNITED STATES Additional patient health information: Female , 80 years of age, weighting 170.0 lb, . Flecainide Acetate dosage: N/A.
Multiple prescriptions taken:
  • Aleve (caplet) (Unk)
  • Verapamil


Eye Swelling, Plantar Erythema, Hypoaesthesia, Choking Sensation, Palmar Erythema, Erythema Of Eyelid (8231166-3)
Adverse event was reported on Mar 23, 2012 by a Female taking Flecainide Acetate (Dosage: 100.0 Mg) . Location: UNITED STATES , 71 years of age, weighting 185.0 lb, After Flecainide was administered, patient encountered several Flecainide side effects: eye swelling, plantar erythema, hypoaesthesia, choking sensation, palmar erythema, erythema of eyelid. Patient was hospitalized.

Toxicity To Various Agents, Arteriosclerosis Coronary Artery, Renal Failure, Dry Skin (8221495-1)
on Mar 16, 2012 Male from SWITZERLAND , 69 years of age, weighting 152.1 lb, was diagnosed with
  • supraventricular tachycardia
and was treated with Flecainide Acetate. Directly after, patient experienced the unwanted or unexpected Flecainide side effects: toxicity to various agents, arteriosclerosis coronary artery, renal failure, dry skin. Flecainide Acetate dosage: 100 Mg, Unk.


Hepatitis (8219979-5)
on Mar 12, 2012 Female from SPAIN , 44 years of age, was treated with Flecainide Acetate. Patient felt the following Flecainide side effects: hepatitis. Flecainide Acetate dosage: 100 Mg.
Multiple prescriptions taken:
  • Citicolina (1 G)
  • Vesicare (5 Mg)
  • Pradaxa (220 Mg)
  • Clopidogrel (75 Mg)
  • Keppra (3000 Mg)
  • Ranitidine Hcl (150 Mg)
  • Paroxetine Hcl (20 Mg)
Patient was hospitalized.

Renal Cancer, Lactic Acidosis, Hypotension, Transfusion-related Acute Lung Injury, Hypoxia, Oliguria, Coagulopathy, Thrombocytopenia, Procedural Haemorrhage (8214496-0)
Patient was taking Flecainide Acetate. After Flecainide was administered, patient encountered several Flecainide side effects: renal cancer, lactic acidosis, hypotension, transfusion-related acute lung injury, hypoxia, oliguria, coagulopathy, thrombocytopenia, procedural haemorrhage on Mar 16, 2012 from UNITED STATES Additional patient health information: Male , 65 years of age, weighting 218.3 lb, . Flecainide Acetate dosage: N/A.
Multiple concurrent drugs taken:
  • Prednisone Tab
  • Omeprazole
  • Vitamin D
  • Levothyroxine Sodium
  • Metformin Hcl
  • Cartia Xt
  • Metformin Hcl
  • Dabigatran (150mg)


Abdominal Pain Upper, Oropharyngeal Blistering, Dysuria, Feeling Abnormal (8189898-1)
Adverse event was reported on Feb 21, 2012 by a Female taking Flecainide Acetate (Dosage: 1 Dosage Forms (1 Dosage Forms, 1 In 1 D), Oral) was diagnosed with
  • atrial fibrillation
  • insomnia
and. Location: FRANCE , 74 years of age, Directly after, patient experienced the unwanted or unexpected Flecainide side effects: abdominal pain upper, oropharyngeal blistering, dysuria, feeling abnormal.
Associated medications used:
  • Zolpidem (1 Dosage Forms (1 Dosage Forms, 1 In 1 D), Oral)
  • Previscan (fluindione) (1 Dosage Forms (1 Dosage Forms, 1 In 1 D))
  • Temeritduo (nebivolol, Hydrochlorothiazide) (1 Dosage Forms (1 Dosage Forms, 1 In 1 D), Oral)


Cerebral Haematoma, Fall (8189620-9)
on Feb 29, 2012 Male from FRANCE , 75 years of age, was treated with Flecainide Acetate. Patient felt the following Flecainide side effects: cerebral haematoma, fall. Flecainide Acetate dosage: 1 Df : 100 Units Nos.
Multiple prescriptions taken:
  • Coumadin (1 Df : 1.25 Units Nos)
  • Monicor Lp (1 Df : 60 Units Nos)
  • Folic Acid
  • Lexomil (1 Df : 0.5 Units Nos)
  • Atorvastatin
  • Polyethylene Glycol (1 Df : 4000 Units Nos)
  • Acetaminophen (1 Df : 500 Units Nos)
Patient was hospitalized.

Blood Creatine Phosphokinase Increased, Myoglobin Blood Increased (8189342-4)
on Feb 23, 2012 Male from FRANCE , 79 years of age, was treated with Flecainide Acetate. After Flecainide was administered, patient encountered several Flecainide side effects: blood creatine phosphokinase increased, myoglobin blood increased. Flecainide Acetate dosage: N/A.
Multiple concurrent drugs taken:
  • Avodart (dutasteride) (dutasteride)
  • Exforge (amlodipine W/valsartan) (amlodipine W/valsartan)
  • Levothyroxine Sodium (1 Df (1 Df, 1 In 1 D) Oral)
  • Previscan (fluindione) (tablet) (fluindione) (1/4 Day 1; 3/4 Dosage Form Day 2 Oral)
  • Allopurinol
Patient was hospitalized.

Anuria, Coma, Dyspnoea, Ventricular Tachycardia, Cyanosis (8183470-5)
Patient was taking Flecainide Acetate. Directly after, patient experienced the unwanted or unexpected Flecainide side effects: anuria, coma, dyspnoea, ventricular tachycardia, cyanosis on Feb 28, 2012 from FRANCE Additional patient health information: Male , 68 years of age, . Flecainide Acetate dosage: N/A.
Associated medications used:
  • Allopurinol
  • Etopophos Preservative Free
  • Vitamin K Tab
  • Lovenox
  • Piperacillin And Tazobactam
  • Amikacin
  • Previscan
  • Corticosteroid Nos
Patient was hospitalized.

Fall, Nerve Compression (8175897-2)
Adverse event was reported on Feb 22, 2012 by a Female taking Flecainide Acetate (Dosage: N/A) . Location: UNITED STATES , weighting 158.7 lb, Patient felt the following Flecainide side effects: fall, nerve compression.
Multiple prescriptions taken:
  • Verapamil
  • Lipitor
  • Rebif
  • Xanax
Patient was hospitalized.

Weight Increased, Constipation (8157307-4)
on Sep 30, 2011 Female from UNITED STATES , 64 years of age, weighting 200.0 lb, was treated with Flecainide Acetate. After Flecainide was administered, patient encountered several Flecainide side effects: weight increased, constipation. Flecainide Acetate dosage: N/A.
Multiple concurrent drugs taken:
  • Pegasys
  • Ribasphere
  • Lasix (lasix)
  • Multivitamin
  • Ondansetron
  • Catapres
  • Potassium Chloride
  • Vitamin D


Heart Rate Irregular, Chest Discomfort, Headache, Body Temperature Decreased, Cardiac Flutter, Body Temperature Fluctuation, Hypoaesthesia, Migraine, Nausea (8150365-2)
on Feb 18, 2012 Female from UNITED STATES , weighting 173.0 lb, was diagnosed with
  • atrial fibrillation
and was treated with Flecainide. Directly after, patient experienced the unwanted or unexpected Flecainide side effects: heart rate irregular, chest discomfort, headache, body temperature decreased, cardiac flutter, body temperature fluctuation, hypoaesthesia, migraine, nausea. Flecainide dosage: 100 Mg, 2x/day.
Associated medications used:
  • Chantix (0.5 Mg, 1x/day)
  • Aspirin (Unk)
  • Acebutolol (200 Mg, 2x/day)


Dizziness, Headache, Muscle Strain, Malaise (8140645-9)
Patient was taking Flecainide Acetate. Patient felt the following Flecainide side effects: dizziness, headache, muscle strain, malaise on Jan 23, 2012 from UNITED STATES Additional patient health information: Female , 58 years of age, was diagnosed with
  • supraventricular tachycardia
and. Flecainide Acetate dosage: 200 Mg.

Atrioventricular Block First Degree, Supraventricular Extrasystoles, Presyncope, Asthenia, Catheterisation Cardiac Abnormal, Left Ventricular Hypertrophy, Hypoaesthesia Oral, Ventricular Hypokinesia (8133514-1)
Adverse event was reported on Feb 01, 2012 by a Male taking Flecainide (Dosage: N/A) . Location: UNITED STATES , weighting 183.0 lb, After Flecainide was administered, patient encountered several Flecainide side effects: atrioventricular block first degree, supraventricular extrasystoles, presyncope, asthenia, catheterisation cardiac abnormal, left ventricular hypertrophy, hypoaesthesia oral, ventricular hypokinesia.
Multiple concurrent drugs taken:
  • Lovaza
  • Ferrous Sulfate Tab
  • Bystolic
  • Nitroglycerin
  • Plavix
  • Actos
  • Crestor
  • Starlix
Patient was hospitalized.

Toxicity To Various Agents (8133482-2)
on Feb 08, 2012 Male from CUBA , child 2 years of age, was treated with Flecainide. Directly after, patient experienced the unwanted or unexpected Flecainide side effects: toxicity to various agents. Flecainide dosage: 1 G. Patient was hospitalized.

Aortic Aneurysm Rupture, Aortic Dissection, Lower Respiratory Tract Infection (8130558-0)
on Feb 06, 2012 Patient from UNITED KINGDOM , weighting 180.1 lb, was diagnosed with
  • supraventricular tachycardia
and was treated with Flecainide. Patient felt the following Flecainide side effects: aortic aneurysm rupture, aortic dissection, lower respiratory tract infection. Flecainide dosage: 50 Mg, Qd.
Multiple prescriptions taken:
  • Securon (120 Mg, Qd)
  • Calcium Carbonate W/vitamin D Nos (125g/10mcg Qd)
  • Simvastatin (20 Mg, Qd)
  • Anastrozole (1 Mg, Unk)
  • Acetylsalicylic Acid Srt (2.5 Mg, Qd)
  • Valsartan (500 Mg, Qd)
  • Bendroflumethiazide (25 Mg, Qd)
Patient was hospitalized.

Autoimmune Thrombocytopenia (8119996-X)
Patient was taking Flecainide Acetate. After Flecainide was administered, patient encountered several Flecainide side effects: autoimmune thrombocytopenia on Feb 03, 2012 from ITALY Additional patient health information: Male , 91 years of age, . Flecainide Acetate dosage: Unk.
Multiple concurrent drugs taken:
  • Aspirin (100 Mg, Qd)
  • Adalat
  • Enalapril Maleate (Daily Dose 20 Mg)
  • Torsemide (Daily Dose 10 Mg)
Patient was hospitalized.

Feeling Hot, Chills, Arthralgia (8079698-5)
Adverse event was reported on Aug 10, 2011 by a Female taking Flecainide Acetate (Dosage: N/A) was diagnosed with
  • atrial fibrillation
  • heart valve replacement
  • psoriatic arthropathy
and. Location: UNITED STATES , 61 years of age, Directly after, patient experienced the unwanted or unexpected Flecainide side effects: feeling hot, chills, arthralgia.
Associated medications used:
  • Coumadin (3 And 4 Mg Alternating Days)
  • Humira
  • Methotrexate
  • Simvastatin
  • Paxil


Osteoporosis, Skin Lesion, Pubis Fracture, Fall (8073073-5)
on Jan 18, 2012 Female from FRANCE , 72 years of age, was diagnosed with
  • ventricular arrhythmia
  • prophylaxis
  • eczema
and was treated with Flecainide Acetate. Patient felt the following Flecainide side effects: osteoporosis, skin lesion, pubis fracture, fall. Flecainide Acetate dosage: Long-term,scored Tabs,flecaine 100 Sr.
Multiple prescriptions taken:
  • Aspirin (Powder For Oral Solution In Sachet,long-term)
  • Kenacort (1 Df : 0.0111 Units Nos,1 Inj,for The Past 8 Years,long-term)
Patient was hospitalized.

Atrial Flutter, Atrial Fibrillation, Electrocardiogram Abnormal (8051221-0)
on Jan 12, 2012 Male from UNITED STATES , 58 years of age, was diagnosed with
  • atrial flutter
and was treated with Flecainide Acetate. After Flecainide was administered, patient encountered several Flecainide side effects: atrial flutter, atrial fibrillation, electrocardiogram abnormal. Flecainide Acetate dosage: 100 Mg.

Product Taste Abnormal, Product Solubility Abnormal (8046666-9)
Patient was taking Flecainide Acetate. Directly after, patient experienced the unwanted or unexpected Flecainide side effects: product taste abnormal, product solubility abnormal on Dec 20, 2011 from UNITED STATES Additional patient health information: Female , 74 years of age, was diagnosed with
  • atrial fibrillation
and. Flecainide Acetate dosage: 200 Mg.
Associated medications used:
  • Restor
  • Vitamin D


Gastrointestinal Disorder, Vomiting (8019747-3)
Adverse event was reported on Dec 20, 2011 by a Female taking Flecainide Acetate (Dosage: N/A) was diagnosed with
  • arrhythmia
  • leiomyosarcoma
  • nausea
  • abdominal pain upper
and. Location: FRANCE , weighting 108.0 lb, Patient felt the following Flecainide side effects: gastrointestinal disorder, vomiting.
Multiple prescriptions taken:
  • Pazopanib (4600mg Cumulative Dose)
  • Motilium
  • Nexium
  • Aspirin
  • Gemcitabine (3080mg Cumulative Dose)
Patient was hospitalized.

Abasia, Atrial Flutter, Haemorrhage, Pulmonary Vein Stenosis (8013814-6)
on Dec 15, 2011 Female from , 66 years of age, was treated with Flecainide Acetate. After Flecainide was administered, patient encountered several Flecainide side effects: abasia, atrial flutter, haemorrhage, pulmonary vein stenosis. Flecainide Acetate dosage: N/A.
Multiple concurrent drugs taken:
  • Bisoprolol Fumarate
  • Digoxin


Overdose, Menorrhagia, Anaemia (8011299-7)
on Dec 21, 2011 Female from UNITED STATES , weighting 170.0 lb, was diagnosed with
  • atrial fibrillation
and was treated with Flecainide Acetate. Directly after, patient experienced the unwanted or unexpected Flecainide side effects: overdose, menorrhagia, anaemia. Flecainide Acetate dosage: N/A.
Associated medications used:
  • Toprol-xl
  • Digoxin
  • Synthroid
  • Xarelto
  • Xarelto


Showing 1-25 of 361 

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Most drugs have a large list of nonsevere or mild adverse effects which do not rule out continued usage. These effects depend on individual sensitivity, and can include nausea, dizziness, diarrhea, malaise, vomiting, headache, dermatitis, dry mouth, etc. Check commonly reported side effects . These can be considered a form of pseudo-allergic reaction, as not all users experience these effects; many users experience none at all.

You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088.

Flecainide Information

Alternative FLECAINIDE Names:FLECAINID

Active Ingredient: FLECAINID

More About Flecainide

Side Effects reported to FDA: 361. View Flecainide Adverse Reports

Flecainide safety alerts: No

Reported deaths: 41

Reported hospitalizations: 179

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