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The latest in medicinal cannabis research

Medicinal cannabis research continues to span an increasingly diverse range of conditions. These latest studies examine real-world adverse event data, patient-reported outcomes and early laboratory findings across epilepsy, anxiety, Alzheimer’s disease and glioblastoma. 

CBD for drug-resistant epilepsy  

Drawing on seven randomised controlled trials (1,154 participants), this systematic review evaluated CBD as an adjunct treatment for drug-resistant epilepsy. Findings suggest oral CBD was associated with reduced seizure frequency across hard-to-treat epilepsy types, with 20mg/kg per day producing the most consistent results. Side effects were generally mild, though elevated liver enzymes and drowsiness occurred more frequently in patients taking certain concomitant medications. The authors note that alternative formulations, including liposomal and transdermal, showed more variable results and require further investigation. 

High-THC cannabis: what patients are reporting to the TGA 

Analysing 614 TGA adverse event reports submitted between mid-2022 and 2025, this retrospective study found that mood and mental health-related events, including anxiety, psychosis and paranoia, were the most frequently reported side effects of medicinal cannabis. 

Higher- THC products accounted for more than half of all reports, coinciding with an increase in prescriptions for inhaled, higher-strength THC products. The authors highlight the importance of patient screening and ongoing monitoring. 

Medicinal cannabis and anxiety 

This qualitative study explored the experiences of nine Australian adults prescribed medicinal cannabis for anxiety disorders Participants reported perceived improvements in sleep, emotional regulation and daily functioning, alongside g challenges such as stigma and concerns around roadside drug testing laws. The findings suggest that quality of life may be an important consideration alongside symptom change when evaluating treatment outcomes. 

Alzheimer’s and the use of cannabis flower extracts 

Using an in vitro model, researchers investigated whether whole cannabis flower extracts could block key enzymes associated with Alzheimer’s disease progression. The extracts showed enzyme-blocking activity and appeared to protect cells under Alzheimer’s-like conditions. The findings add to preclinical research on whole cannabis extracts, though results remain limited to laboratory models and require further investigation. 

 

References:

  1. Pratama, R., Muhaimin, M., Khairinisa, M.A. et al. Adjunctive cannabidiol for drug-resistant epilepsy: a systematic review and meta-analysis of randomized trials across syndromes, formulations, and dose ranges. Ther Clin Risk Manag (2026). https://doi.org/10.2147/TCRM.S601774
  2. Graham, M., Tisdale, C., Nielsen, S. A retrospective analysis of voluntary adverse event reports to the TGA with higher THC medicinal cannabis products. Aust N Z J Psychiatry 60, 699–703 (2026). https://doi.org/10.1177/00048674261445267
  3. Roberts, L., Cumming, C., Budgeon, C.A. et al. Beyond symptom change: a qualitative descriptive study of reported quality of life experiences among adults prescribed medicinal cannabis for anxiety disorders. Int J Clin Pharm (2026). https://doi.org/10.1007/s11096-026-02176-2
  4. Shitrit, A., Khattib, A. & Khatib, S. Cannabis flower extracts as a multi-target agent in Alzheimer’s disease: Inhibition of AChE, BChE, and BACE1 with cell-protective effects in a PC12 cell model. J Cannabis Res (2026). https://doi.org/10.1186/s42238-026-00479-9
  5. Barciszewska, AM., Belter, A., Barciszewski, J.F. et al. Phytocannabinoids as epigenetic regulators: bridging DNA methylation and redox homeostasis in glioblastoma. J Appl Genetics (2026). https://doi.org/10.1007/s13353-026-01070-x