insomnia
"Zolpidem worked well at the 5mg dose for about 3 or 4 nights.  Then I noticed my lips were dry, mildly cracked, and tender.  Gradually I noticed that the tip of my tongue felt as though it had been burnt. I ignored that as I drink hot coffee.  On the 4th day I used a Listerine-like mouthwash; the result was an immediate and severe reaction:  the inside of my mouth became bright red and swollen. My face broke out in scattered red spots or streaks. Once I had spat out the mouthwash and the pain had gone down, I noticed that my eyes, or the tissue around my eyes, also felt dry and sore.  Two days later, the reaction is gradually clearing."