What are your thoughts on Cymbalta with elders?

On 5-1-12 the dr put my grandma on cymbalta. She doesnt do well with meds..clonazapam effected her severely..she is taking 30mg of cymbalta ...just wondering if the minor side effects will get better with time. She has dry mouth and tired. Was also wondering if it has helped anyone with the pain from fibromyalgia and neuropathy?...btw i really like this site get some great advice :-)