Pictures of Klonopin (Clonazepam), drug imprint information, side effects for the patient. 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. Farmacologia. Il clonazepam come tutte le altre benzodiazepine è dotato di spiccate proprietà ansiolitiche, sedative, antiepilettiche e miorilassanti e viene classificato assieme all'alprazolam e al flunitrazepam come benzodiazepina ad alta potenza (1 mg di clonazepam equivale a circa 20 mg di diazepam). Clonazepam has many side effects. The most common ones in people treated for seizures are drowsiness, ataxia (a type of clumsiness), and behavior changes. Find patient medical information for Clonazepam Oral on WebMD including its uses, side effects and safety, interactions, pictures, warnings and user ratings. 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. WARNINGS: Taking clonazepam with opioid medications (such as codeine, hydrocodone) may increase your risk of very serious side effects, including death. It depends on the patient. In some patients who are new to clonazepam 1 mg is enough to make you very drowsy. In other patients who take it on a regular basis, 1 mg will relax you and relieve anxiety. Clonazepam Tablets USP, a benzodiazepine, is available as scored tablets containing 0.5 mg of Clonazepam and unscored tablets containing 1 mg or 2 mg of Clonazepam. Clonazepam oral tablet is available as a generic drug and a brand-name drug. Brand name: Klonopin. Clonazepam comes as both an oral tablet and an oral disintegrating (dissolving) tablet.