insomnia
"I have been on Lunesta since 2010. Worked like a charm. Definitely left a metallic taste even the next morning, but I did not care because I could sleep and wake refreshed.  I immediately switched to the generic once available and had no issues. However, earlier this year I noticed that the medication no longer had the metallic taste BUT I also noticed that it stopped working.  It is obvious that the manufacturer has changed the inactive ingredients to do away with the side effect of the metallic taste but now the medication is NOT working and I don't know what I am going to do."