Lorazepam (Ativan) is thought that excessive activity of nerves in the brain may cause anxiety and other psychological disorders. Gamma-aminobutyric acid (GABA) is a neurotransmitter, a chemical that nerves in the brain use to send messages to one another that reduces the activity of nerves in the brain. Clonazepam is usually used as an add-on medication for people who continue to have seizures while taking other seizure medicines, or sometimes as a medication of last resort after most others have failed. ALL BENZODIAZEPINES ARE NON-SELECTIVE. Professor C Heather Ashton, DM, FRCP April 2001. It is often suggested that the chemical makeup of diazepam [Valium] does not address many of the receptor sites the newer medications (eg alprazolam [Xanax], clonazepam [Klonopin]) have an effect on. 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. As with other benzodiazepines, lorazepam should be used with extreme caution in patients with pulmonary disease and in patients with respiratory insufficiency resulting from chronic obstructive pulmonary disease (COPD), status asthmaticus, abnormal airway anatomy, cyanotic congenital heart disease, or pulmonary hypertension. Teva has obsoleted its clonazepam and will be re-launching the Actavis Clonazepam this week. This is what I was told when I called customer service. Lorazepam, a benzodiazepine with antianxiety, sedative, and anticonvulsant effects, is intended for the intramuscular or intravenous routes of administration. Doctors give trusted answers on uses, effects, side-effects, and cautions: Dr. Cordas on b12 mcg vs mg: Vitamin B12 is more effective and more sure to deliver the vitamin to the body. Klonopin (Clonazepam) is a benzodiazepine drug that is commonly prescribed for management of epileptic seizures as well as anxiety and panic attacks. Ativan (Lorazepam) is a benzodiazepine drug that is most commonly used for the treatment of anxiety disorders. It is among the most potent benzodiazepines on the market and is used for the short-term treatment of anxiety, panic attacks, insomnia, acute seizures, and to sedate aggressive hospital patients.