adverse effects
[/ˈædvɜːrs ɪˈfɛkts/]
noun phrasepl: N/A (plural noun)
efeitos adversos
1. Negative or harmful consequences, particularly unwanted reactions or outcomes caused by a medication, treatment, or action
The medication may cause adverse effects such as dizziness and nausea.
O medicamento pode causar efeitos adversos como tontura e náusea.
2. In medical and pharmaceutical contexts, undesirable reactions that occur as a result of medical intervention
Patients should be informed about potential adverse effects before starting treatment.
Os pacientes devem ser informados sobre possíveis efeitos adversos antes de iniciar o tratamento.
3. Negative impacts or consequences on health, environment, or well-being
Pollution has adverse effects on public health.
A poluição tem efeitos adversos na saúde pública.
In both Brazilian and American medical contexts, 'adverse effects' is formal, technical terminology commonly used in pharmaceutical labeling, clinical research, and healthcare documentation. In Brazil, 'efeitos colaterais' (side effects) is also widely used colloquially alongside the more formal 'efeitos adversos'. Healthcare professionals and patients increasingly use 'adverse effects' in formal medical communications due to regulatory standards and international pharmaceutical guidelines.
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