I've been taking Clonazepam for over 20 years. I started on 1 mg. twice a day. The morning Clonazepam made me sleepy throughout the day. The next visit, he changed it to 1 mg. at night. I have epilepsy and it controlled my night-time seizures. The last visit, I started noting I wasn't sleeping as well. I requested to have the Clonazepam adjusted to 2mg. at night. He didn't hesitate to prescribe 2mg. tablet for me. I've checked the side effects of the drugs I take online pretty religiously. I have never seen an article stating that long term use of Clonazepam causing dementia or Alzheimer. If you already have dementia or Alzheimer, then it is not prescribed. I have been started on Lexipro. (5mg. 1 morning, 1 evening) for anxiety and has been working very well. I take a supplement, Kava, in the afternoon usually with lunch and also find it very helpful.