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Information on neurological and psychiatric adverse events following immunization (AEFIs) with COVID-19 vaccines is limited. We examined and compared neurological and psychiatric AEFIS reports related to BNT162b2 (Pfizer-BioNTech) and ChAdOx1 (Oxford-AstraZeneca) COVID-19 vaccines and recorded in the United Kingdom Medicines and Healthcare products Regulatory Agency between 9 December 2020 and 30 June 2021. As of 30 June 2021, 46.1 million doses of ChAdOx1 and 30.3 million doses of BNT162b2 had been administered. The most frequently reported AEFI was headache with 1,686 and 575 cases per million doses of ChAdOx1 and BNT162b2, respectively. AEFIs more frequently reported after CHAdOx1 compared with BNT162b2 vaccination were Guillain-Barré syndrome (OR, 95% CI = 2.53, 1.82–3.51), freezing (6.66, 3.12–14.22), cluster headache (1.53, 1.28–1.84), migraine (1.23,1.17–1.30), postural dizziness (1.24,1.13–1.37), tremor (2.86, 2.68–3.05), headache (1.40, 1.38–1.43), paresthesia (1.11, 1.06–1.16), delirium (1.85, 1.45–2.36), hallucination (2.20, 1.82–2.66), poor quality sleep (1.53, 1.26–1.85), and nervousness (1.54, 1.26–1.89) Reactions less frequently reported with ChAdOx1 than with BNT162b2 were Bell’s palsy (0.47, 0.41–0.55), anosmia (0.58, 0.47–0.71), facial paralysis (0.35, 0.29–0.41), dysgeusia (0.68, 0.62–0.73), presyncope (0.48, 0.42–0.55), syncope (0.63, 0.58–0.67), and anxiety (0.75 (0.67–0.85). Neurological and psychiatric AEFIs were relatively infrequent, but each vaccine was associated with a distinctive toxic profile.

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Disproportionality analysis of adverse neurological and psychiatric reactions with the ChAdOx1 (Oxford-AstraZeneca) and BNT162b2 (Pfizer-BioNTech) COVID-19 vaccines in the United Kingdom