Lexapro (escitalopram) is not a benzodiazepine. It belongs to a completely different drug class called selective serotonin reuptake inhibitors, or SSRIs. The two types of medication work through different brain chemicals, carry different risks, and are used in different ways, even though both can treat anxiety.
How Lexapro Actually Works
Lexapro increases the amount of serotonin available in your brain. It does this by blocking a transporter protein that normally pulls serotonin back into nerve cells after it’s been released. With that recycling process slowed down, serotonin stays active in the gaps between neurons for longer, which gradually improves mood and reduces anxiety.
The FDA has approved Lexapro for two conditions: major depressive disorder (in adults and adolescents 12 and older) and generalized anxiety disorder in adults. It is not a controlled substance. The DEA assigns it no schedule, and premarketing studies found no evidence of drug-seeking behavior among people who took it.
How Benzodiazepines Work Differently
Benzodiazepines target an entirely different system. Instead of serotonin, they act on GABA, the brain’s main calming neurotransmitter. A benzodiazepine binds to a spot on the GABA receptor that’s separate from where GABA itself attaches, and nudges the receptor into a state where it responds more strongly to GABA. The result is rapid sedation, muscle relaxation, and anxiety relief, often within 30 to 60 minutes of taking a dose.
Common benzodiazepines include alprazolam (Xanax), lorazepam (Ativan), and diazepam (Valium). All are classified as Schedule IV controlled substances because of their potential for misuse and dependence.
Speed of Relief
One of the biggest practical differences is how quickly each drug works. Benzodiazepines produce noticeable calm within an hour, which is why they’re sometimes prescribed for acute panic or situational anxiety. Lexapro, on the other hand, takes weeks to build its full effect. During those first weeks, you may actually experience temporary side effects like nausea, dizziness, headaches, jitteriness, and sleep difficulties before the benefits kick in.
This slow ramp-up is one reason some people are prescribed both drugs at the same time. A benzodiazepine can provide short-term relief while the SSRI is still building up in the system. The benzodiazepine is then tapered off once the SSRI starts working. This combination can also help manage the early-treatment jitteriness or agitation that SSRIs sometimes cause.
Addiction and Dependence Risk
Benzodiazepines can be addictive, though the risk varies from person to person. Shorter-acting versions like alprazolam carry a higher dependence risk than longer-acting ones like diazepam. Because of this, benzodiazepines are not recommended for people with a history of substance abuse and are generally not meant to be taken indefinitely.
Lexapro does not carry the same addiction risk. Animal studies suggest its abuse potential is low, and clinical experience has not revealed patterns of dependence or drug-seeking. That said, stopping Lexapro abruptly can cause discontinuation symptoms, including dizziness, irritability, and flu-like feelings. Both drug classes benefit from a gradual taper rather than a sudden stop.
Long-Term Side Effects
The side effect profiles diverge significantly over time. Benzodiazepines have been linked to over-sedation, problems with coordination, and cognitive impairment that can compound with prolonged use. Long-term benzodiazepine use has also been associated with an increased risk of developing dementia.
Lexapro’s early side effects, like nausea and headaches, tend to fade within the first few weeks. Longer-term side effects can include sexual dysfunction and weight changes, but it does not carry the same cognitive risks associated with extended benzodiazepine use. For these reasons, SSRIs like Lexapro are typically considered better suited for ongoing, daily treatment of anxiety and depression, while benzodiazepines are better reserved for short-term or as-needed use.
Why the Confusion Happens
The mix-up is understandable. Both Lexapro and benzodiazepines are commonly prescribed for anxiety, and a person who receives either one from their doctor may not know the distinction. But they are fundamentally different tools. Lexapro works slowly by raising serotonin levels over weeks, is not a controlled substance, and is designed for daily long-term use. Benzodiazepines work rapidly by enhancing GABA activity, are controlled substances with real addiction potential, and are best used for short periods. Knowing which category your medication falls into helps you understand what to expect from it and how to use it safely.