"be careful. i was prescribed circadin by my psychiatrist to help with insomnia caused by my antidepressant. over a period of around 3 months i became anxious, agitated, and extremely depressed. i felt like i was losing my mind. i then realised that my deterioration coincided with starting the melatonin so i stopped it. within 24 hours by depression was under control and i was back to my normal self. it says on the drug information that it can worsen depression and cause mood changes yet my psychiatrist thought it would be a good idea to prescribe it for someone with severe depression. it also caused awful trapped wind and tummy pain. it&#039;s a shame because as a sleeping tablet it did actually work. back to zopiclone for me!"