Drug Interactions

Drug interactions with hawthorn are theoretically possible with cardioactive medications, but have not been documented (2). In addition, the flavonoid constituents have been shown to have inhibitory and inducible effects on the cytochrome P-450 enzyme system, making other drug interactions possible (20). However, an in vivo study of a potential pharmacokinetic interaction of digoxin and hawthorn demonstrated that concurrent administration had no effect on digoxin pharmacokinetics, suggesting that the two could be safely administered together from a pharmacokinetic point of view (21). However, one must be mindful of additive effects and a potential pharmacodynamic interaction.

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