"i take about 10 milligrams of doxaprin about four nights a week. i&#039;ve been doing this for about 8 months now .i don&#039;t have trouble falling asleep i have trouble staying asleep and doxaprin keeps me asleep. i now sleep like a baby on this 4 nights. i don&#039;t really build a tolerance up to it like i did with xanax. i find virtually no side effects other than i don&#039;t want to get out of bed in the morning but a cup of coffee solves that. unless there is some long term side effects i don&#039;t know about i can&#039;t say anything negative about this substance good luck."