DESCRIPTION. Klonopin, a benzodiazepine, is available as scored tablets with a K-shaped perforation containing 0.5 mg of clonazepam and unscored tablets with a K-shaped perforation containing 1 mg or 2 mg of clonazepam. When they are removed, the brain may experience a rebound as GABA and dopamine levels decrease. This rebound effect often includes a return of symptoms the drugs may have been treating, and when they return, the symptoms may be more severe than the original symptoms. Learn about the benzodiazepine drug class including their uses, a list of common benzodiazepines, side effects, warnings and withdrawal symptoms. Clonazepam, sold under the brand name Klonopin among others, is a medication used to prevent and treat seizures, panic disorder, and for the movement disorder known as akathisia. It is a tranquilizer of the benzodiazepine class. It is taken by mouth. It begins having an effect within an hour and lasts between 6 and 12 hours. Severity of Withdrawal Symptoms. If you have been using Ativan for 6 months or longer, it may be more difficult to abstain. Research reports that short-term benzodiazepine users are more likely to experience mild symptoms of withdrawal. Benzodiazepines are a class of drugs that act as central nervous system depressants, or sedatives and tranquilizers. Clonazepam, with a trade name of Klonopin, is an anxiolytic drug prescribed to manage seizure disorders and also panic disorders by slowing down some of the bodily and brain functions related to anxiety and stress. Rebound symptoms are also common. These are symptoms of underlying disorders that the Klonopin may have been keeping under control. If you originally began taking Klonopin to treat the symptoms of an anxiety disorder, those symptoms might come back. Klonopin has a long half life which means it takes 4-8 days for your blood to have half of the dose you took. As needed use ( PRN)is for short acting benzodiazepines like Ativan Any taper needs close physician monitoring. Klonopin (Clonazepam) is a benzodiazepine drug that is commonly prescribed for management of epileptic seizures as well as anxiety and panic attacks. It syndrome can be mild and short-lived or severe and sometimes protracted [31]. Symptoms include many that are common to anxiety states in general, as well as.