People who experience certain types of epileptic seizures or panic disorder may benefit from Klonopin^® (clonazepam). This prescription drug works to cause a calming effect by acting on a certain type of chemical in the brain. Klonopin is available as a tablet or an orally disintegrating tablet, and is usually taken two or three times daily. Some of the common side effects seen with this drug include drowsiness, coordination problems, and behavior problems. Seek medical attention immediately if you happen to overdose on Klonopin. Symptoms of a Klonopin overdose can include slow reflexes, confusion, or a coma.