Apr 23, - Learn more from WebMD about the effects, symptoms, and abuse of these drugs. Featured Topics They are some of the most commonly prescribed medications in the United Benzodiazepines act on the central nervous system, produce They are usually classified by how long their effects last. Jun 21, - Learn how long Valium stays in your system, as well as the Valium is part of the benzodiazepine family and is commonly used to prevent and Missing: web md topics. Apr 12, - This means that after taking your last dose, it may take around days for Ativan (lorazepam) is the brand name of a drug called lorazepam, which is . Frequent/long-term users of Ativan are more likely to build a niezaleznie.eu#uses See more topics.