Klonopin^® (clonazepam) is a prescription drug that has been approved to treat panic disorder and certain types of epileptic seizures. As with any drug, there are possible side effects with Klonopin. Some of the common side effects seen with this drug include drowsiness, coordination problems, and behavior problems. The dosage of Klonopin that your healthcare provider recommends will vary, depending on several factors, such as your age, other medical conditions you have, other medications you are taking, and the condition being treated. Prior to taking Klonopin, be sure to talk to your healthcare provider about your medical history and any other medicines you are taking (including vitamins and herbal supplements).