Ativan (lorazepam) and Klonopin (clonazepam) are benzodiazepines but differ in duration and uses. Ativan has a shorter onset and intermediate duration, often used for acute anxiety or insomnia. Klonopin acts longer, making it useful for chronic anxiety and seizure disorders. Ativan is more sedating, while Klonopin provides steadier control. Dependence risk exists with both, but dosing frequency is typically lower with Klonopin due to its longer half-life.