Hydroxyzine and Xanax both reduce anxiety, but they are fundamentally different medications. They belong to separate drug classes, work through entirely different brain pathways, and carry very different risks. The most important distinction: Xanax can cause physical dependence and withdrawal, while hydroxyzine generally does not.
How Each Drug Works
Hydroxyzine is an antihistamine. It blocks histamine receptors in the brain, which creates a sedating, calming effect that happens to reduce anxiety. It’s the same basic mechanism behind allergy medications like Benadryl, though hydroxyzine is more potent in the brain.
Xanax (alprazolam) is a benzodiazepine. It works by boosting the activity of GABA, a neurotransmitter that slows brain activity and promotes relaxation. This is a much more direct route to calming the nervous system, which is why Xanax tends to feel stronger and faster, but it’s also why it carries addiction risk.
Think of it this way: hydroxyzine calms you down as a side effect of blocking histamine. Xanax calms you down because that’s exactly what it was designed to do at the neurotransmitter level.
How They Compare for Anxiety
Despite their different mechanisms, clinical evidence suggests hydroxyzine performs about as well as benzodiazepines for generalized anxiety disorder. A review of five studies with 884 total participants found hydroxyzine was equivalent to benzodiazepines in efficacy, acceptability, and tolerability. That said, the researchers noted the studies were small and had a high risk of bias, so the evidence isn’t strong enough to call hydroxyzine a reliable first-line treatment on its own.
Where they differ more clearly is in scope. Xanax is commonly prescribed for both generalized anxiety and panic disorder, where its fast onset is especially useful during acute panic attacks. Hydroxyzine is used more broadly: anxiety, itching, allergic reactions, and as a pre-surgery sedative. It’s often chosen when a prescriber wants to treat anxiety without reaching for a controlled substance.
Addiction and Dependence Risk
This is the biggest practical difference between the two. Xanax is a DEA Schedule IV controlled substance, meaning it has a recognized potential for abuse and dependence. In user reports on Drugs.com, 4.8% of alprazolam reviewers mentioned addiction and 4.5% mentioned withdrawal as notable side effects.
Hydroxyzine is not a controlled substance at all. It does not appear on any DEA scheduling list. Your body does not develop the same kind of physical dependence on hydroxyzine that it does on benzodiazepines, and stopping it does not trigger dangerous withdrawal symptoms. In fact, hydroxyzine is sometimes prescribed specifically to help manage the anxiety and symptoms that come with tapering off Xanax.
Withdrawal: A Critical Difference
Stopping Xanax abruptly after regular use can be medically dangerous. People who quit cold turkey have reported severe spikes in blood pressure, intense headaches, nausea, muscle weakness, insomnia, paranoia, and worsening anxiety and depression. These symptoms can appear within days of the last dose, and the risk is worse for people who take it daily. Xanax should always be tapered gradually under medical supervision.
Hydroxyzine does not carry this risk. You may notice your anxiety returns when you stop taking it, since the calming effect goes away, but there’s no rebound withdrawal syndrome comparable to what benzodiazepines produce.
Side Effects
Both medications cause drowsiness, but hydroxyzine is significantly more sedating. In user-reported data, 21.8% of hydroxyzine users flagged drowsiness as a notable side effect, compared to 4.3% for alprazolam. Tiredness was reported by 10.6% of hydroxyzine users versus 2.3% for alprazolam. Hydroxyzine also commonly causes dry mouth, dizziness, and nausea, all tied to its antihistamine and anticholinergic properties.
Xanax’s side effect profile looks different. Beyond drowsiness, its most commonly reported issues are addiction, withdrawal symptoms, and paradoxically, ongoing anxiety and panic attacks (likely from rebound effects between doses). Xanax also interacts dangerously with alcohol, potentially causing severe respiratory depression.
Safety Concerns for Older Adults
Neither medication is considered ideal for adults over 65. The American Geriatrics Society’s Beers Criteria, a widely used safety guideline, flags both drug classes as potentially inappropriate for older adults. Benzodiazepines like Xanax are flagged for impaired metabolism, cognitive impairment, and unsteady gait, all of which increase fall risk. Antihistamines like hydroxyzine are flagged for confusion, cognitive impairment, and delirium.
If either medication is prescribed to an older adult, it typically requires closer monitoring and possibly lower doses.
Why Prescribers Choose One Over the Other
The choice often comes down to the clinical situation and the patient’s history. Hydroxyzine is a common first choice when a prescriber wants to avoid the risks of a controlled substance. It’s favored for people with a history of substance use, for long-term anxiety management, and for situations where the sedating side effect is actually welcome (like insomnia alongside anxiety). It’s also used freely in combination with other medications since it doesn’t carry the same interaction risks as benzodiazepines.
Xanax is typically reserved for situations where fast, potent relief is needed, particularly panic disorder or severe acute anxiety episodes. Because of its dependence risk, it’s generally prescribed at the lowest effective dose for the shortest possible time. Many prescribers view it as a short-term tool rather than an ongoing treatment.
So while both medications can reduce anxiety, they are not interchangeable. Hydroxyzine is a milder, safer option with no addiction potential but more sedation. Xanax is a more powerful anxiolytic that works faster but comes with significant risks around dependence and withdrawal.