They do different things. Benzos like Ativan enhance the effects of GABA which is an inhibitory neurotransmitter in the brain (it reduces neuron excitability). Increasing the effects of something that inhibits brain activity leads to a calmer state and it works very fast. SSRIs increase the levels of serotonin available in the brain by preventing serotonin getting reabsorbed into neurons. It takes the brain a while to readjust to the increased serotonin levels which is why it takes longer.
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