I have been taking Doxepin since 1978. My dosage started at 10mg and over the years increased to 75mg. I have two questions: 1. Is there any long term side effects such as memory loss. 2. I'm not sure if the drug is still working. I'm considering reducing the dosage from 75mg to 50mg and then from 50mg to 25mg until I am off the drug. I view this process taking up to one year. Any thoughts regarding my 2 questions.