Some background: I was prescribed 25mg Hydroxyzine for sleep. I haven't had an experience with it before, and earlier I had taken Klonopin (early enough for it to have stopped working, however). I have pretty high baseline anxiety, which is why I think I may have gotten some of the effects I did. On with the report.
Hydroxyzine
Well-documented
Well-documented
Multiple authoritative sources agree on dosing and effects.
- 4 corroborating sources
- 1 ROA with full dose ladder
- duration data present
- 19 combo interactions documented
- PubChem toxicity data
Well-documented
Multiple authoritative sources agree on dosing and effects.
- 4 corroborating sources
- 1 ROA with full dose ladder
- duration data present
- 19 combo interactions documented
- PubChem toxicity data
Aliases: Atarax, Hyzine, Rezine, Vistaril, Vistaject
Summary
Hydroxyzine is an FDA-approved first-generation antihistamine commonly used short-term for anxiety, pruritus, and premedication. At normal therapeutic oral doses (25-50 mg), hydroxyzine has no significant respiratory depressant effects on its own. Tolerance to CNS effects develops rapidly (3-7 days), limiting long-term anxiolytic efficacy; maximum recommended duration is 4 months for anxiety.
Dose Information
| ROA | Light | Common | Strong | Heavy |
|---|---|---|---|---|
| Oral | 25-50mg | 50-100mg | 100-150mg | 150mg+ |
Light
Common
Strong
Heavy
Onset, Duration & After-effects
| ROA | Onset | Comeup | Peak | Offset | Total |
|---|---|---|---|---|---|
| Oral | 15-30 min | - | 2-4 hrs | - | 4-6 hrs |
| Intramuscular | 15-30 min | 15-30 min | 1-2 hrs | 2-3 hrs | 3-5 hrs |
Tolerance
Build-up
sedative effects diminish within 1–2 weeks of daily use
Reset
a few days of abstinence
Tolerance Decay
Full tolerance
3d
Half tolerance
4d
Baseline
~5d
Acute tolerance: develops within a single session — the reset numbers above apply after sustained heavy use, not after one binge. Within-session tachyphylaxis usually resets largely overnight.
Cross-Tolerances
Diphenhydramine
30%
Doxylamine
30%
Effects
Aggregated from 15 Erowid experience reports
Positive Effects 5
Anxiety Suppression
73.3%
70%
Sedation
60.0%
70%
Euphoria
33.3%
70%
Focus Enhancement
20.0%
70%
Stimulation
20.0%
70%
Adverse Effects 0
Combinations
Cross-Check Hydroxyzine with another substanceCommunity Trip Reports
Anecdotal first-person accounts from Reddit, Erowid, and Bluelight. Click a source to expand. Reports are harm-reduction context, not medical guidance.
Erowid 6 reports 2 neutral 4 cautionary visit
This is an overview of my hydroxyzine usage. I was prescribed some hydroxyzine by an online insomnia management clinic and it helped me not feel as if I am always rushing around. When I take it at night a noticeable difference is felt.
Taking a Large Dose I'm prescribed Hydroxyzine for anxiety, take-as-needed. I hardly ever need it, so I end up stockpiling it to take in large doses when I don't have anything else.
I had been prescribed Vistaril (hydroxyzine) to combat anxiety. I was prescribed 50mg pills to be taken 4x a day as needed. Let me tell you: Vistaril does fuck-all nothing for anxiety. Anxiety is a funny thing. If I get to a point where it's bad enough, I'll do almost anything to make it stop.
I ended up getting prescribed these for my anxiety. I have pretty bad anxiety, specifically when I'm trying to go to sleep because I have nothing to take my mind off of the thoughts. Anyways, I was really anxious one night. I have 25mg tabs, small and white. I took 4 of them.
Got prescribed Hydroxyzine 15mg pills to combat anxiety. Around 6pm I was feeling anxious and decided to try one. Effects came up in around 30-45 minutes, and I started to feel very cloudy and drowsy. I feel the relaxation from the drug was just because I was starting to feel more and more tired.
Bluelight 2 threads 1 positive 1 cautionary visit
I took 50MG vyvance this morning, and 50MG hydroxyzine about 2 hours after, I feel very euphoric, and focused. I dont feel as hyper and OCD. I feel relaxed physically, and im not twitching out, not scratching my nose every 5 seconds, im just mellow, but focused and euphoric..
I consumed too much alcohol last night and I knew I was going to wake up still drunk. I can't let my drinking binge continue due to work and out-of-town guests coming in, so I wanted to "sleep it off" in it's entirety.
Pill Identifiers
41
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