Adverse effects of medication
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Definitions and Classification of Adverse Effects of Medication
Adverse effects of medication, also called adverse drug reactions (ADRs), are harmful or unpleasant responses to drugs that can occur at normal doses used for prevention, diagnosis, or treatment of disease. These reactions can be dose-related, non-dose-related, time-related, or related to withdrawal or therapy failure, and may require changes in treatment or stopping the medication altogether 2510. ADRs are distinct from side effects, which are unintended but sometimes beneficial actions of a drug, and from adverse events, which may not be directly linked to medication use .
Prevalence and Impact of Adverse Drug Reactions
ADRs are common in both hospital and primary care settings, affecting a significant proportion of patients. Studies have shown that 14.7% of adults in a health center and 17% of hospital inpatients reported adverse reactions to drugs, with fatal reactions occurring in a small but notable percentage of cases . ADRs are a leading cause of morbidity and mortality worldwide, especially as medication regimens become more complex and populations age 3468+1 MORE. They also contribute to increased healthcare costs and can significantly reduce patients’ quality of life 346.
Common Types and Systems Affected
The most frequently reported ADRs involve the central nervous system, gastrointestinal system, and cardiovascular system . In psychiatry, common adverse effects include extrapyramidal symptoms (such as dystonia, parkinsonism, akathisia, and tardive dyskinesia), neuroleptic malignant syndrome, hyperprolactinaemia, arrhythmias, sexual dysfunction, hyponatraemia, serotonin syndrome, and increased bleeding risk with certain antidepressants 17. Antibiotics and non-steroidal anti-inflammatory drugs are often implicated in serious reactions, including those that occur during anesthesia .
Risk Factors for Adverse Effects
Several factors increase the risk of experiencing ADRs. Elderly patients, those with impaired liver or kidney function, individuals taking multiple medications (polypharmacy), and those with multiple health conditions are at higher risk 36. The use of high-risk medications and certain care situations also contribute to the likelihood of adverse events . Some reactions, such as drug allergies, occur only in susceptible individuals, while others can affect anyone 24.
Management and Prevention Strategies
Managing ADRs involves identifying and withdrawing the offending drug if possible, treating the symptoms, and reporting the reaction for pharmacovigilance purposes 589. For antipsychotic-induced side effects, strategies include dose reduction, switching medications, behavioral interventions, or using additional medications to counteract specific adverse effects 17. Prevention relies on careful medication selection, monitoring, and awareness of patient-specific risk factors 3689. Pharmacovigilance systems play a crucial role in detecting, assessing, and preventing adverse effects .
Conclusion
Adverse effects of medication are a significant challenge in healthcare, affecting many patients and leading to serious health and economic consequences. They can involve various organ systems and are influenced by patient characteristics, drug properties, and healthcare settings. Effective management and prevention require vigilance, individualized care, and robust reporting systems to minimize harm and improve patient outcomes 1234+6 MORE.
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