Food increases the bioavailability of propafenone

Area of Science:

• Pharmacology
• Clinical Pharmacy

Background:

• Propafenone is an antiarrhythmic medication.
• Understanding drug bioavailability is crucial for effective therapeutic outcomes.

Purpose of the Study:

• To evaluate the effect of food intake on propafenone bioavailability.
• To compare propafenone pharmacokinetics in fasted versus fed states.

Main Methods:

• 24 healthy volunteers participated in the study.
• Propafenone kinetics were assessed in both fasted and fed (post-breakfast) states.
• Plasma drug concentrations and area under the concentration-time curve (AUCo) were analyzed.

Main Results:

• Food intake led to earlier and significantly increased maximum plasma propafenone concentrations.
• Excluding slow metabolizers, AUCo increased by an average of 147% after a meal.
• A strong correlation was observed between the relative increase in AUCo and fasted-state propafenone intrinsic clearance.
• Propafenone bioavailability was not significantly affected in slow metabolizers.

Conclusions:

• Food intake significantly enhances propafenone bioavailability, particularly in non-slow metabolizers.
• Consistent administration of propafenone with food is recommended to ensure predictable drug levels.
• Dosage adjustments may be considered based on individual metabolic status and food intake.