Last reviewed: 22 May 2021
Last updated: 11 Jun 2021
11 Jun 2021

US FDA approves aducanumab for Alzheimer's disease

Aducanumab, an antibody directed against amyloid beta, has been approved by the US Food and Drug Administration (FDA) for the treatment of Alzheimer's disease (AD).

Patients with mild AD receiving aducanumab showed a significant dose- and time-dependent reduction of amyloid beta plaque in phase 3 trials; patients in the control arm showed no reduction.[192][193] While a reduction of amyloid beta plaque in the brain, a surrogate endpoint, is reasonably likely to predict a reduction in cognitive decline, the FDA notes that there are residual uncertainties regarding the clinical benefit of aducanumab. The accelerated approval necessitates that post-approval studies are conducted; continued approval is contingent upon verification of clinical benefit in these trials.

See Management: emerging

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History and exam

Key diagnostic factors

  • presence of risk factors
  • memory loss
  • disorientation
  • nominal dysphasia
  • misplacing items/getting lost
  • apathy
  • decline in activities of daily living and instrumental activities of daily living (IADLs)
  • personality change
  • unremarkable initial physical examination

Other diagnostic factors

  • mood changes
  • poor abstract thinking
  • constructional dyspraxia
  • prosopagnosia
  • autoprosopagnosia

Risk factors

  • advanced age
  • family history
  • genetics
  • Down's syndrome
  • cerebrovascular disease
  • lifestyle factors and medications
  • less than secondary school education
  • traumatic brain injury
  • depression
  • hearing loss
  • hyperlipidaemia
  • female sex
  • elevated plasma homocysteine level
  • artificially sweetened soft drink consumption

Diagnostic investigations

1st investigations to order

  • bedside cognitive testing
  • FBC
  • metabolic panel
  • serum thyroid-stimulating hormone (TSH)
  • serum vitamin B12
  • urine drug screen
  • CT
  • MRI

Investigations to consider

  • cerebrospinal fluid (CSF) analysis
  • serum rapid plasma reagin/Venereal Disease Research Laboratory (VDRL)
  • serum HIV
  • formal neuropsychological testing
  • genetic testing
  • fluorodeoxyglucose-PET (FDG-PET)
  • single-photon emission CT (SPECT)
  • electroencephalogram (EEG)

Treatment algorithm


Associate Professor of Psychiatry

Icahn School of Medicine at Mount Sinai

New York



JN declares that she has no competing interests.

Dr Judith Neugroschl would like to gratefully acknowledge Dr Brandy R. Matthews, Dr Asif S. Bhutto, and Dr Julie K. Gammack, the previous contributors to this topic.


BRM, ASB, and JKG declare that they have no competing interests.

Peer reviewersVIEW ALL

Medical Director

Kings Harbor Multicare Center

New York



RJG declares that he has no competing interests.

Professor of Neurology

Department of Neurology/Alzheimer Center

VU University Medical Center


The Netherlands


PS declares that he has no competing interests.

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