Rythmol Sr
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Questions & Answers
Side Effects & Adverse Reactions
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FDA Safety Alerts
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Manufacturer Warnings
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FDA Labeling Changes
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Uses
RYTHMOL SR® is indicated to prolong the time to recurrence of symptomatic atrial fibrillation (AF) in patients with episodic (most likely paroxysmal or persistent) AF who do not have structural heart disease.
Usage Considerations:
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- The use of RYTHMOL SR in patients with permanent AF or in patients exclusively with atrial flutter or paroxysmal supraventricular tachycardia (PSVT) has not been evaluated. Do not use RYTHMOL SR to control ventricular rate during AF.
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- Some patients with atrial flutter treated with propafenone have developed 1:1 conduction, producing an increase in ventricular rate. Concomitant treatment with drugs that increase the functional atrioventricular (AV) nodal refractory period is recommended.
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- The effect of propafenone on mortality has not been determined [see Boxed Warning].
History
There is currently no drug history available for this drug.
Other Information
RYTHMOL SR (propafenone hydrochloride) is an antiarrhythmic drug supplied in extended-release capsules of 225, 325 and 425 mg for oral administration.
Chemically, propafenone hydrochloride is 2’-[2-Hydroxy-3-(propylamino)-propoxy]-3-phenylpropiophenone hydrochloride, with a molecular weight of 377.92. The molecular formula is C21H27NO3•HCl.
Propafenone HCl has some structural similarities to beta-blocking agents. The structural formula of propafenone HCl is given below:
Propafenone HCl occurs as colorless crystals or white crystalline powder with a very bitter taste. It is slightly soluble in water (20°C), chloroform and ethanol. RYTHMOL SR capsules are filled with cylindrical-shaped 2 x 2 mm microtablets containing propafenone and the following inactive ingredients: antifoam, gelatin, hypromellose, magnesium stearate, red iron oxide, shellac, sodium dodecyl sulfate, sodium lauryl sulfate, soy lecithin, and titanium dioxide.
Sources
Rythmol Sr Manufacturers
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Glaxosmithkline Llc
![Rythmol Sr (Propafenone Hydrochloride) Capsule, Extended Release [Glaxosmithkline Llc]](/wp-content/themes/bootstrap/assets/img/loading2.gif)
Rythmol Sr | Glaxosmithkline Llc
RYTHMOL SR can be taken with or without food. Do not crush or further divide the contents of the capsule.
The dose of RYTHMOL SR must be individually titrated on the basis of response and tolerance. Initiate therapy with RYTHMOL SR 225 mg given every 12 hours. Dosage may be increased at a minimum of 5-day intervals to 325 mg given every 12 hours. If additional therapeutic effect is needed, the dose of RYTHMOL SR may be increased to 425 mg given every 12 hours.
In patients with hepatic impairment or those with significant widening of the QRS complex or second-or third-degree AV block, consider reducing the dose.
The combination of CYP3A4 inhibition and either CYP2D6 deficiency or CYP2D6 inhibition with the simultaneous administration of propafenone may significantly increase the concentration of propafenone and thereby increase the risk of proarrhythmia and other adverse events. Therefore, avoid simultaneous use of RYTHMOL SR with both a CYP2D6 inhibitor and a CYP3A4 inhibitor [see Warnings and Precautions (5.4), Drug Interactions (7.1)].
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