A quetiapine “high” is not the euphoric rush associated with opioids or stimulants. The dominant sensation is heavy, sometimes overwhelming sedation, often described by users as feeling “mellow,” deeply relaxed, and mentally slowed down. About 75% of people who misuse quetiapine report “feeling mellow” as the primary positive effect, and roughly two-thirds use it specifically to come down from other substances like cocaine or methamphetamine rather than to get high in the traditional sense.
Why It Feels Different From Other Drugs
Quetiapine (sold as Seroquel) is an antipsychotic, not a drug designed to activate the brain’s reward system. Stimulants and opioids flood dopamine into your brain’s pleasure centers, creating intense euphoria. Quetiapine does the opposite: it loosely binds to dopamine receptors and detaches quickly, which is enough for its medical purpose but not enough to generate that rewarding “hit.” It also blocks serotonin receptors, which contributes to its calming effects but doesn’t produce the kind of pleasure that drives classic addiction.
The sensation people describe as a quetiapine high comes primarily from its strong binding to histamine receptors in the brain. This is the same system that makes older allergy medications cause drowsiness, except quetiapine hits those receptors much harder. The result is intense sleepiness, a heavy-limbed feeling, and a mental fog that some people find pleasant, particularly if they’re anxious, overstimulated, or coming off stimulants. A survey of people who misuse quetiapine found that the most common reported effect was sleep induction or tranquilization, not euphoria.
What Users Typically Report
People who take quetiapine recreationally describe a cluster of sensations that center on sedation rather than stimulation. Within 30 to 60 minutes of an oral dose, the drug produces a wave of drowsiness that can feel almost impossible to resist. Thinking slows noticeably. Some users report a detached, dreamlike quality to their surroundings. Others describe it as feeling “knocked out” rather than pleasantly altered.
The negative effects are consistent with what the drug does pharmacologically. Users commonly report extreme thirst, difficulty concentrating, feeling groggy or “hungover” the next day, and orthostatic hypotension, which means a sudden drop in blood pressure when standing that causes dizziness or lightheadedness. At higher doses, some people experience confusion, slurred speech, and difficulty walking.
The experience is dose-dependent. At low to moderate doses (the range most people who misuse it tend to use), the effect is primarily a deep, sedative calm. True euphoria is rarely reported even at high doses, and taking large amounts dramatically increases the risk of dangerous side effects rather than a better high.
How It’s Misused
Quetiapine has picked up several street names: “quell,” “Susie-Q,” and “baby heroin.” The term “Q-ball” refers to combining it with cocaine or heroin. Among addiction treatment patients, quetiapine accounts for 96% of all antipsychotic misuse. People obtain it primarily from doctors (52%) or from family and friends (48%).
Most misuse involves swallowing tablets, but some people crush them to snort or, less commonly, dissolve and inject them. Snorting speeds up the onset of sedation but also increases risks. About 25% of people who misuse quetiapine say they use it to enhance the effects of other substances, while roughly 67% use it to recover from other drugs, particularly to sleep after stimulant binges. This “landing gear” use is especially common in correctional facilities, where quetiapine is one of few available sedating medications.
Physical Dangers of Misuse
Quetiapine overdose looks nothing like opioid or stimulant overdose. The hallmark signs are central nervous system depression (extreme drowsiness progressing to unconsciousness) and a racing heart. In overdose cases, about 95% of patients show reduced consciousness and over 80% develop a rapid heartbeat. Up to 40% experience dangerously low blood pressure, a rate much higher than with most other antipsychotics. Seizures, respiratory depression, and coma (reported in about 10% of overdose cases) are possible at very high doses.
Combining quetiapine with opioids, benzodiazepines, or alcohol is particularly risky. While one study found that quetiapine may not add as much sedation to opioids as previously feared, mixing any central nervous system depressants increases the chance of respiratory failure. The drug’s effect on heart rhythm, specifically a change called QTc prolongation, can become dangerous at high doses and may contribute to cardiac events.
Tolerance, Weight Gain, and Other Costs
Even prescribed quetiapine carries notable side effects that become more pronounced with misuse. In clinical trials, patients gained an average of 10 to 13.5 pounds over the first three months. Quetiapine also significantly raised cholesterol and triglyceride levels, increasing long-term cardiovascular risk. These metabolic changes stem from the same histamine receptor activity that produces the sedation people seek.
Long-term use carries a small but real risk of tardive dyskinesia, a condition involving involuntary movements of the face, tongue, or limbs. The annualized rate is roughly 0.4% in younger patients, which sounds low but represents a permanent, often irreversible condition. The risk accumulates the longer you take the drug.
What Withdrawal Feels Like
Stopping quetiapine abruptly after regular use triggers withdrawal symptoms that typically begin one to four days after the last dose. Common symptoms include insomnia (often severe, since the brain has adjusted to the drug’s sedating effects), nausea, vomiting, dizziness, increased heart rate, and restlessness. Some people experience rebound anxiety or agitation that feels worse than whatever they were using the drug to manage.
Most withdrawal symptoms resolve within a week, though some can linger at reduced intensity for up to six weeks. In rare cases, people develop withdrawal dyskinesia, involuntary movements that appear after discontinuation. Tapering the dose gradually rather than stopping cold significantly reduces the severity of these symptoms.