Can Hydroxyzine Get You High? Effects and Risks Explained

Hydroxyzine produces sedation and a drowsy, calming sensation, but the experience falls well short of what most people mean by “getting high.” It is a first-generation antihistamine that crosses into the brain readily, which is why it can make you feel noticeably altered, but it does not trigger the rush of euphoria associated with drugs that are commonly abused. Research among people with opioid dependence found that misuse of antihistaminergic anxiolytics like hydroxyzine was relatively uncommon and rarely involved illicit acquisition, suggesting the drug holds limited appeal as a recreational substance. That said, the sedation is real, the impairment is measurable, and the risks of misuse or overdose are not zero.

What Hydroxyzine Actually Does in the Brain

Hydroxyzine belongs to the older, first-generation class of antihistamines. Unlike newer antihistamines designed to stay out of the central nervous system, hydroxyzine crosses the blood-brain barrier in significant amounts and blocks histamine receptors in the brain itself.¹ That is why it makes you drowsy. It also has anticholinergic properties, meaning it interferes with the neurotransmitter acetylcholine, and it affects serotonin signaling to some degree. Together, these actions produce the sedation, muscle relaxation, and mild anxiolytic effect that doctors prescribe it for.

The “high” question comes from the fact that these brain effects are perceptible. You feel something when you take hydroxyzine, especially at higher doses. The feeling is typically described as heavy-headed drowsiness, a sense of calm or detachment, and sometimes mild euphoria layered into the sedation. But this is qualitatively different from the reward-circuit activation caused by opioids, benzodiazepines, or stimulants. There is no dopamine surge, no rush, and no intense pleasure. People who take hydroxyzine expecting something recreational tend to be disappointed, which is probably why misuse rates stay low.

How Sedating Is It, and Can You Tell You Are Impaired?

Hydroxyzine’s sedation is not subtle. In a controlled comparison against placebo and several other antihistamines, hydroxyzine at just 25 mg caused the greatest psychomotor impairment of any drug tested, and participants could clearly distinguish it from placebo.² That study also found something worth noting: after repeated doses over several days, the impairment lessened somewhat, suggesting partial tolerance develops. But the tolerance was incomplete, meaning the drug kept affecting performance even after days of regular use.

One of the more troubling findings is that people taking sedating antihistamines like hydroxyzine may not realize how impaired they are. A driving study found that subjects on hydroxyzine had significantly slower brake reaction times than those on a non-sedating antihistamine, yet the drivers themselves did not always perceive the impairment.³ This mismatch between how impaired you feel and how impaired you actually are is a genuine safety concern, especially because hydroxyzine is often prescribed casually for allergies or mild anxiety with little warning about next-day effects.

Why Hydroxyzine Makes Driving Dangerous

The driving impairment is worth its own discussion because the evidence is strong and the implications are practical. In an actual on-road driving study, hydroxyzine at 50 mg significantly increased lane-weaving on both day one and day eight of treatment.⁴ The researchers concluded that hydroxyzine produces “severe driving impairment” after a single dose and that this impairment only partly fades with continued use. The word “severe” in a clinical paper is not used lightly.

Adding alcohol to the mix makes things dramatically worse. In a separate placebo-controlled study, hydroxyzine alone impaired critical flicker fusion, recognition reaction time, and total reaction time compared to placebo. When alcohol was added on top of hydroxyzine, performance collapsed across every measure tested.⁵ If you are taking hydroxyzine and drinking even moderately, you should not be behind the wheel. The combination impairs you more than either substance alone, and you are unlikely to gauge the severity of that impairment accurately.

Is There Real Abuse Potential?

Compared to the drugs people actually seek out recreationally, hydroxyzine ranks low. A study of people in opioid maintenance treatment in Sweden, a group already prone to misusing other prescriptions, found that only about 12 to 15 percent reported ever using antihistaminergic anxiolytics like hydroxyzine non-medically. That sounds like a concerning number until you compare it to the 60 percent who reported non-medical use of sleeping pills or the 21 percent for pregabalin. Even more telling, only 6 to 10 percent of those who did misuse antihistaminergic anxiolytics obtained them illicitly, compared to 61 percent for sleeping pills.⁶ The researchers concluded that non-medical use of these antihistamines did not appear to be a major clinical problem in that population.

This does not mean hydroxyzine is never misused. People sometimes take higher-than-prescribed doses chasing deeper sedation, or they combine it with other substances to amplify effects. The drug is sometimes taken alongside opioids with the belief that it boosts the opioid high or helps manage withdrawal symptoms. There is some clinical evidence that hydroxyzine, combined with the anti-nausea drug palonosetron, can reduce objective signs of acute opioid withdrawal.⁷ But the street-level practice of combining hydroxyzine with opioids to intensify the experience is a different and riskier game.

The Opioid Combination Problem

Hydroxyzine has been used in clinical settings alongside opioids for decades, based on the theory that it has an “opioid-sparing” effect, meaning it could allow lower opioid doses while maintaining pain relief. A critical review of that practice found that the supporting evidence was riddled with problems: no placebo controls, no statistical analysis, and reliance on subjective assessments.⁸ Worse, at doses that might actually contribute to pain relief, hydroxyzine adds respiratory depression on top of whatever the opioid is already doing. Unlike opioid-induced respiratory depression, which can be reversed with naloxone, the respiratory depression from hydroxyzine cannot be reversed that way. This makes the combination particularly dangerous in overdose situations.

If you are taking hydroxyzine alongside any opioid, whether prescribed or not, the respiratory risk is additive. The sedation feels like relaxation, but the underlying physiology involves your brainstem becoming less responsive to rising carbon dioxide levels in your blood. That is the mechanism behind overdose deaths, and it does not announce itself with warning symptoms before it becomes critical.

What Happens in Overdose

Hydroxyzine overdose looks different from overdose on the better-known sedating antihistamine diphenhydramine (Benadryl). A cohort analysis comparing the two found that hydroxyzine-poisoned patients were less likely to develop the classic antimuscarinic syndrome of rapid heart rate, dilated pupils, dry skin, and agitation. Instead, they were more likely to show mild central nervous system depression: drowsiness progressing to stupor.⁹ This matters because the presentation can look deceptively calm. A person who has taken too much hydroxyzine may seem like they are just very sleepy rather than in a medical emergency.

The more dangerous overdose risk involves the heart. Hydroxyzine can prolong the QT interval, a measure of the heart’s electrical cycle, which raises the risk of a potentially fatal arrhythmia called torsade de pointes. A review of 27 case reports of QT prolongation in patients taking hydroxyzine at or below the maximum recommended dose found that every single case had at least one additional risk factor, most commonly a combination of cardiovascular disease and other QT-prolonging medications.¹⁰ So while the cardiac risk at normal doses in otherwise healthy people appears low, it climbs quickly if you have heart problems, take other medications that affect heart rhythm, or push the dose above recommended levels.

Hydroxyzine for Anxiety and Why That Matters for Misuse

Part of the reason hydroxyzine gets misused is that it actually works for anxiety, and doctors prescribe it frequently as a non-addictive alternative to benzodiazepines. A Cochrane systematic review found that hydroxyzine was more effective than placebo for generalized anxiety disorder and performed roughly equivalently to both benzodiazepines and buspirone.¹¹ A separate three-month trial confirmed that hydroxyzine showed no statistically significant difference from the benzodiazepine bromazepam for anxiety treatment.¹²

This creates an interesting dynamic. Because hydroxyzine genuinely reduces anxiety and is considered non-addictive by most prescribing guidelines, it gets handed out more freely than benzodiazepines. Patients who find that it works for their anxiety may be tempted to take extra when they feel particularly anxious, gradually escalating doses on their own. The drug is also sometimes prescribed on an as-needed basis, which gives people latitude to decide how much and how often to take it. For someone prone to substance use issues, this flexibility can become a problem even with a drug that has a relatively low abuse ceiling.

Tolerance and What Stopping Feels Like

The partial tolerance to hydroxyzine’s sedation that develops over days of use has a flip side: stopping abruptly after regular use can produce withdrawal-like effects. This is not the dramatic withdrawal seen with benzodiazepines or opioids, but it is real. A case report documented a patient who developed delusional infestation, the unshakeable belief that bugs were crawling on or under the skin, after suddenly stopping long-term hydroxyzine. The symptoms correlated with drug withdrawal on a standardized adverse-reaction scale and improved when hydroxyzine was reintroduced.¹³

This is a single dramatic case, not a typical experience, but it illustrates that the brain adapts to regular hydroxyzine exposure. More commonly, people who stop taking it after weeks or months of daily use report rebound anxiety, insomnia, and general irritability. These symptoms often get attributed to the return of the original condition the drug was treating, but at least some component is likely pharmacological rebound. If you have been taking hydroxyzine daily and want to stop, tapering down gradually rather than quitting cold turkey is a reasonable precaution.

The Long-Term Concern About Brain Health

Perhaps the most important risk of hydroxyzine that rarely comes up in conversations about misuse is its anticholinergic burden. Hydroxyzine blocks acetylcholine in the brain, and a growing body of evidence links cumulative anticholinergic exposure to increased dementia risk. A large Swedish case-control study found a dose-response relationship between cumulative use of strong anticholinergics, including antihistamines, and all-cause dementia. People with the highest cumulative exposure had roughly 66 percent higher odds of dementia compared to those with no exposure, and even modest cumulative use was associated with about a 10 percent increase.¹⁴

This does not mean taking hydroxyzine for a week will give you dementia. The relationship is cumulative, meaning it matters how much you take over how many years. But for someone who has been using hydroxyzine daily for years, either as prescribed or through self-directed escalation, the anticholinergic load adds up. This is especially relevant for older adults, who are both more likely to be prescribed hydroxyzine and more vulnerable to cognitive effects. Many geriatric prescribing guidelines now recommend avoiding hydroxyzine and similar first-generation antihistamines in people over 65 for exactly this reason.

Who Is Most at Risk for Problems

The people most likely to run into trouble with hydroxyzine fall into a few overlapping groups. Those with existing substance use disorders, particularly opioid use disorder, may combine hydroxyzine with other depressants, creating dangerous respiratory and cardiac risks. People with heart conditions or those already taking QT-prolonging medications face elevated cardiac risk even at standard doses.¹⁰ Older adults face both the acute impairment risks (falls, confusion, driving accidents) and the long-term cognitive concerns from anticholinergic exposure.

Young people who obtain hydroxyzine from someone else’s prescription and experiment with high doses are another risk group. Because the drug is perceived as mild and non-addictive, the assumption is that taking a lot of it is relatively safe. But high-dose hydroxyzine combined with alcohol, cannabis, or other sedating substances can produce profound sedation, dangerous cardiac rhythm changes, and respiratory compromise. The fact that hydroxyzine is not a controlled substance in most places gives a false impression of safety at any dose.

How Hydroxyzine Compares to What People Expect

If you are comparing the subjective experience of hydroxyzine to a benzodiazepine, you will notice overlap in the calming and muscle-relaxing effects, but benzodiazepines produce a more pronounced sense of disinhibition and emotional loosening. If you are comparing it to an opioid, there is almost no overlap: opioids generate warmth, euphoria, and pain relief that hydroxyzine simply cannot match. If you are comparing it to alcohol, the sedation is similar but without the social disinhibition or mood elevation.

The honest answer to “can hydroxyzine get you high” is that it can make you feel noticeably different from baseline, especially at doses above 50 mg, but what you feel is better described as heavy sedation with mild calm rather than a high. For most people, this is not a pleasant enough experience to repeat recreationally. The people who do seek it out tend to be either managing anxiety on their own without medical guidance, combining it with other substances for a cumulative sedative effect, or using it to smooth out the edges of opioid withdrawal. In each of these scenarios, the risk profile is meaningfully worse than taking the drug as prescribed for its intended purposes.