"i have been taking amitriptyline for 3 and a half years since i was 12 (now 15), due to sleeping problems. i started on 10mg doses every night for the first couple of months but that didn&#039;t work so the doctors gradually increased me up to 50 mg (current dosage). they started working for a couple of months however they no longer work but i have never had any side affects. now i get little sleep and am often feeling sick due to lack of sleep and often can no longer concentrate at school. hope this doesn&#039;t happen to you at work."