Little evidence that cannabis harms cognition in people with HIV

What the researchers found

The review found little evidence supporting harmful effects of cannabis on cognition in people with HIV. Where effects were observed, they were function-dependent (varying by cognitive domain) and confounded by age, frequency of use, and other factors. Anti-inflammatory mechanisms were proposed as a potential beneficial pathway.

Why it matters

People with HIV have high rates of both cannabis use and neurocognitive impairment. If cannabis is not worsening cognition (and may have anti-inflammatory benefits), this changes the risk-benefit calculation for HIV patients who use cannabis.

The numbers in context

Limited eligible preclinical data existed. Effects varied by cognitive function domain studied.

How the study worked

Systematic scoping review of clinical and preclinical studies evaluating effects of cannabinoid exposure on cognition in HIV. Included discussion of potential mechanisms and screening considerations.

What this study cannot tell us

Few preclinical studies available. Clinical studies confounded by multiple factors. "Function-dependent" effects make broad conclusions difficult. Cannot determine whether cannabis is truly neutral or whether positive and negative effects cancel out.

How to read the evidence

Systematic scoping review with limited available evidence, providing a useful overview but not definitive conclusions.

When this study was published

2024 systematic scoping review of clinical and preclinical evidence

The bigger picture

HIV-associated neuroinflammation is a major driver of cognitive impairment in people living with HIV. Cannabis's anti-inflammatory properties could theoretically reduce this neuroinflammation, creating a scenario where the net cognitive effect differs from the general population.

Questions still open

• Could specific cannabinoid formulations improve cognition in people with HIV? Should cognitive screening protocols differ for HIV patients who use cannabis?

Common questions

Read the original research

The Impact of Cannabis Use on Cognition in People with HIV: Evidence of Function-Dependent Effects and Mechanisms from Clinical and Preclinical Studies.

Current HIV/AIDS reports, 21(3), 87-115

Citation

Ayoub, Samantha M; Holloway, Breanna M; Miranda, Alannah H; Roberts, Benjamin Z; Young, Jared W; Minassian, Arpi; Ellis, Ronald J. (2024). The Impact of Cannabis Use on Cognition in People with HIV: Evidence of Function-Dependent Effects and Mechanisms from Clinical and Preclinical Studies.. Current HIV/AIDS reports, 21(3), 87-115. https://doi.org/10.1007/s11904-024-00698-w

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