Adverse Drug Reactions and Drug Interactions

Medications possess significant health risks including ADEs, MEs, adverse drug reactions (ADR), DDIs, and other outcomes of nonoptimized drug use, defined commonly as drug-related problems. Due to nonstandardized use of these terms, comparing studies and calculating a rate of incidence is sometimes “impossible mission.” ADRs can be described as an unwanted harmful reaction that occur following drug application and suspected to be drug related. The recent definition of ADR including reactions those resulting from MEs, abuse, or misuse, as well reactions to unlicensed medicine, off-label use in addition to use of authorized medicines according to label. DDIs can change drug action caused by concomitant administration one or more drugs, and they can be harmful and fatal. The estimated mean of health care cost due to nonoptimized medication used was 528.4 billion USD in 2016. This sum was equivalent to 16% of total US health care expenditure.