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In a new study, men who took phosphodiesterase type 5 inhibitors (PDE5Is), such as Viagra (sildenafil; Pfizer), for treatment of erectile dysfunction, were found to be 18 per cent less likely to develop Alzheimer's compared to those who did not take the drugs. The results of the population-based cohort study were published in Neurology on 7 February 2024. Researchers at University of Oxford examined IQVIA Medical Research Data UK records of 269,725 men, who were diagnosed with erectile dysfunction between January 2000 and March 2017. None of the participants had any memory or thinking problems at the start of the study and they were followed for an average of 5.1 years. During the study, 749 out of 1,119 participants taking erectile dysfunction drugs developed Alzheimer's disease.

The first big breakthrough in 30 years of Alzheimer's research is providing momentum for clinical trials of "cocktail" treatments targeting the two hallmark proteins associated with the mind-robbing disease, according to interviews with researchers and pharmaceutical executives. Drugmakers Eisai and Biogen reported in September that their therapy lecanemab could slow progress of the disease by 27% over 18 months compared with a placebo. The finding validates the theory that clearing the amyloid protein that forms clumps in the brains of Alzheimer's patients could slow or halt the disease and has strengthened the support from some scientists for simultaneously targeting another notorious protein linked to Alzheimer's: tau. Eisai and Biogen are scheduled to present full data from their lecanemab study on Tuesday at the Clinical Trials on Alzheimer's Disease conference in San Francisco. The U.S. Food and Drug Administration is expected to make a decision by early January on the companies' application for accelerated approval. If approved on an accelerated basis, the companies said they would immediately apply for full U.S. regulatory approval which could help secure Medicare coverage.