Drug interactions

[Jason Yan]

The effect a drug has on a person may be different than expected because that drug interacts with

Another drug the person is taking (drug-drug interaction)
Food, beverages, or supplements the person is consuming (drug-nutrient interaction)
Another disease the person has (drug-disease interaction)

The effects of drug interactions are usually unwanted and sometimes harmful. Interactions may

Increase the actions of one or more drugs, resulting in side effects or toxicity
Decrease the actions of one or more drugs, resulting in failed treatment