There is no exact estimate available for a lethal dose of Zopiclone
alone. You have consumed 150mg of the drug and you are still able to write a question on this website. It gives me an indication that either you have taken the pills just now and waiting for something to happen, or you have taken the tablets some time back and wondering if there are any long term effects.
When taken alone, Zopiclone at 150mg does not seem to pose a threat to life. But it might make you sleep for a long time and affect your cognition.
Please contact your primary care
physician for more help. Take care.
Abhijeet Deshmukh, MD