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Norpace (Disopyramide Phosphate) - Summary




In the National Heart, Lung and Blood Institute's Cardiac Arrhythmia Suppression Trial (CAST), a long-term, multi-center, randomized, double-blind study in patients with asymptomatic non-life-threatening ventricular arrhythmias who had had a myocardial infarction more than 6 days but less than 2 years previously, an excessive mortality or non-fatal cardiac arrest rate (7.7%) was seen in patients treated with encainide or flecainide compared with that seen in patients assigned to carefully matched placebo-treated groups (3.0%). The average duration of treatment with encainide or flecainide in this study was 10 months.

The applicability of the CAST results to other populations (e.g., those without recent myocardial infarction) is uncertain. Considering the known proarrhythmic properties of Norpace or Norpace CR and the lack of evidence of improved survival for any antiarrhythmic drug in patients without life-threatening arrhythmias, the use of Norpace or Norpace CR as well as other antiarrhythmic agents should be reserved for patients with life-threatening ventricular arrhythmias.



disopyramide phosphate capsules

Norpace® CR
disopyramide phosphate
extended-release capsules

Norpace (disopyramide phosphate) is an antiarrhythmic drug available for oral administration in immediate-release and controlled-release capsules containing 100 mg or 150 mg of disopyramide base, present as the phosphate. The base content of the phosphate salt is 77.6%.

Norpace and Norpace CR are indicated for the treatment of documented ventricular arrhythmias, such as sustained ventricular tachycardia, that, in the judgment of the physician, are life-threatening. Because of the proarrhythmic effects of Norpace and Norpace CR, their use with lesser arrhythmias is generally not recommended. Treatment of patients with asymptomatic ventricular premature contractions should be avoided.

Initiation of Norpace or Norpace CR treatment, as with other antiarrhythmic agents used to treat life-threatening arrhythmias, should be carried out in the hospital. Norpace CR should not be used initially if rapid establishment of disopyramide plasma levels is desired.

Antiarrhythmic drugs have not been shown to enhance survival in patients with ventricular arrhythmias.

See all Norpace indications & dosage >>


Published Studies Related to Norpace (Disopyramide)

Prospective comparative study of intravenous cibenzoline and disopyramide therapy in the treatment of paroxysmal atrial fibrillation after cardiovascular surgery. [2010.09]
CONCLUSIONS: The efficacy of iv cibenzoline for the termination of postoperative paroxysmal AF was significantly better than that of disopyramide, especially in patients with pre-administration of oral beta-adrenergic blockers and those with smaller left atrium.

Comparison of acute reduction in left ventricular outflow tract pressure gradient in obstructive hypertrophic cardiomyopathy by disopyramide versus pilsicainide versus cibenzoline. [2010.11.01]
Negative inotropic agents are often administered to decrease the left ventricular (LV) pressure gradient in patients with obstructive hypertrophic cardiomyopathy (HC)... Accordingly, sodium channel blockade might be more important for reducing the LV pressure gradient at rest in patients with obstructive HC than calcium channel blockade or beta blockade.

High efficacy of disopyramide in the management of ventricular fibrillation storms in a patient with Brugada syndrome. [2010.06.01]
The patient was a 57-year-old man with Brugada syndrome, who had been implanted with a implantable cardioverter defibrillator (ICD). The frequency of ventricular fibrillation (VF) started to increase about 4 years after ICD implantation, occurring, at worst, six times in one night.Findings observed in our case suggest that disopyramide could be added in our arsenal of medications for treating arrhythmic storms in patient with Brugada syndrome.

Torsades de Pointes induced by a combination of garenoxacin and disopyramide and other cytochrome P450, family 3, subfamily A polypeptide-4-influencing drugs during hypokalemia due to licorice. [2010.04]
We report an 82-year-old man who developed ventricular tachycardia and Torsades de Pointes (TdP) after oral administration of garenoxacin, a novel quinolone antibiotic agent that differs from the third-generation quinolones, for pneumonia... Therefore, although garenoxacin reportedly causes fewer adverse reactions for cardiac rhythms than third-generation quinolone antibiotics, one must be cautious of the interference of other drugs during hypokalemia in order to prevent TdP.

Possible acute and chronic synergistic effect of dual chamber pacing and disopyramide in obstructive hypertrophic cardiomyopathy: a case report. [2010.01]
It remains unclear whether the combination of dual-chamber (DDD) pacing and disopyramide can achieve prolonged left ventricular outflow tract (LVOT) gradient reduction and symptom relief in patients with obstructive hypertrophic cardiomyopathy (HCM)... This combination might enable physicians to treat and manage elderly symptomatic obstructive HCM patients with a severe LVOT gradient more effectively and less invasively.

more studies >>

Clinical Trials Related to Norpace (Disopyramide)

Atrial Fibrillation Follow-Up Investigation of Rhythm Management (AFFIRM) [Completed]
To compare two standard treatment strategies for atrial fibrillation: ventricular rate control and anticoagulation vs. rhythm control and anticoagulation.

AV Node Ablation and Pacemaker Therapy Compared to Drug Therapy for Atrial Fibrillation - Pilot Study [Recruiting]
The purpose of this study is to determine whether early atrioventricular node (AVN) ablation with pacing device therapy will reduce death and hospitalization when compared to the conventional drug therapy in elderly patients with recurrent and symptomatic atrial fibrillation (AF).

more trials >>

Reports of Suspected Norpace (Disopyramide) Side Effects

Femur Fracture (6)Pain (6)Fall (6)DRY Mouth (6)Blood Cholesterol Increased (6)Anaemia (6)HIP Fracture (6)Palpitations (3)Myocardial Infarction (3)Thoracic Vertebral Fracture (3)more >>

Page last updated: 2011-12-09

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