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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.