panic disorde
"Have been taking Klonopin for nearly 20 years. At one point my doctor was prescribing 3mg per day. The past couple years I've been taking .25mg (1/4) mg per day. It has been very helpful in preventing panic attacks and reducing my anxiety in general. My only side effect has been mild drowsiness. 

My doctor has tried to help me go off this medication completely on 2 occasions. The 1st time I developed muscle spasms throughout my body including rapid heartbeat. The 2nd time I became unable to sleep and anxiety attacks resumed. Both times my dosage was decreased gradually over a period of 2 to 3 months after I'd been taking 1 mg per day. Since then, when my doctor suggested trying to ween me off it again I reminded him of the prior problems."