Long-term side effects of drugs, and lack of accountability of these companies is certainly an issue and sometimes takes decades to come out.
https://www.health.harvard.edu/blog/benzodiazepine-use-may-r...
2014 - People who had taken a benzodiazepine for three months or less had about the same dementia risk as those who had never taken one. Taking the drug for three to six months raised the risk of developing Alzheimer’s by 32%, and taking it for more than six months boosted the risk by 84%.
https://www.aarp.org/health/dementia/info-2019/dementia-slee...
2019 - The study, released today at the Alzheimer's Association International Conference 2019, included a racially diverse group of 3,068 people, ages 70 to 79, who were cognitively healthy when the study began. Researchers questioned the participants about their use of sleeping pills and culled information about them from medical records and tests of brain function over a 15-year period.