Find out how melatonin can promote sleep and understand possible side medicalcases.eug: purchase lorazepam 1mg. Melatonin is also used for the inability to fall asleep (insomnia); delayed sleep phase Melatonin is also used for some of the side effects of cancer treatment. Feb 8, - The correct dosage of melatonin can be a problem. When taken in the correct dose ( mg), it can be effective for shift workers and people Missing: lorazepam.