Been on it for several years and have also developed a tolerance. Take l-lysine with it to help with mouth sores. just live with dry mouth. Now I have to take another muscle relaxant, chlorzoxazone, and ambien. rotating ambien with other things. ready for new dr and evaluation. i'm glad you've found a good combination. still looking. tessie b. I'll get a maid someday but till then I'm Queen of the House!