The acute physical effects of being drugged typically wear off within 12 hours, but full recovery takes longer. Most people feel significantly impaired for 2 to 8 hours depending on the substance used, then experience hangover-like symptoms for another 24 to 48 hours. Psychological effects, particularly if the drugging was connected to an assault, can persist for weeks or months.
The timeline varies because “roofied” is a catch-all term. The original reference is to Rohypnol (flunitrazepam), but GHB and ketamine are also commonly used to spike drinks. Each drug moves through your body at a different speed, and alcohol in your system makes all of them hit harder and last longer.
How Long the Drug Itself Lasts
Rohypnol is the slowest to clear. Its effects begin about 30 minutes after ingestion, peak around the two-hour mark, and can last 8 to 12 hours. That means you could be visibly impaired or unconscious for a large portion of a night and still feel heavy sedation into the next morning.
GHB acts faster but leaves sooner. Effects appear within 15 to 30 minutes and peak between 20 and 60 minutes. GHB has an extremely short elimination half-life of roughly 27 minutes, meaning the body breaks it down quickly. The intense sedation from a single dose often resolves within a few hours, though higher doses extend that window.
Ketamine is the briefest. Its effects come on rapidly and last only about 30 to 45 minutes, though disorientation and confusion can linger beyond that initial window.
Why Alcohol Makes It Worse
Most drugging incidents happen in settings where the person is already drinking. Alcohol doesn’t just add to the sedative effect; it multiplies it. Research on flunitrazepam and alcohol together found the combination is “superadditive,” meaning the impairment is greater than you’d expect from simply stacking the two substances. Doses of either drug that would normally be mild can become medically dangerous when combined. The sedation hits faster, goes deeper, and the progressive motor depression (your muscles becoming increasingly unresponsive) is more severe. This interaction is a major reason why people who have been drugged often cannot walk, speak clearly, or stay conscious, even if the drug dose alone might not have caused that level of impairment.
The First 24 to 48 Hours
Once the primary sedation lifts, most people don’t feel normal. The residual symptoms closely resemble a severe hangover but are often more disorienting. Common complaints in the first day or two include:
- Extreme drowsiness that persists well beyond waking up
- Nausea and vomiting
- Headache and dizziness
- Confusion, brain fog, and disorientation
- Muscle weakness and loss of coordination
- Slowed thinking and delayed reaction times
These symptoms generally resolve within 24 to 48 hours for most substances. Rohypnol, because of its longer duration, tends to produce a more prolonged “hangover” phase than GHB or ketamine. Some people report feeling not quite right for up to 72 hours, particularly if alcohol was also involved.
Memory Loss and Blackouts
One of the most distressing parts of being drugged is the gap in memory. Benzodiazepines like Rohypnol cause anterograde amnesia, meaning your brain stops forming new memories while the drug is active. This isn’t like forgetting details of a night out. Entire hours can be completely absent, with no amount of effort bringing them back.
GHB produces similar blackouts, particularly at higher doses or when combined with alcohol. The memory gap typically covers the period of peak drug activity. For Rohypnol, that can mean losing several hours. For GHB, the gap is usually shorter but can still be substantial.
These memories generally do not return. The issue isn’t retrieval (like a word on the tip of your tongue) but encoding. The brain never recorded the events in the first place. Some fragments may surface, but expecting full recall is unrealistic, and the uncertainty itself can be a source of significant distress.
Detection Windows Are Short
If you suspect you were drugged, timing matters enormously for toxicology testing. GHB clears the bloodstream within hours because of its rapid metabolism. A delay of even one or two hours in collecting a blood sample can mean the substance is missed entirely. Blood testing is most useful within 48 hours of the incident, and for GHB specifically, the sooner the better.
Urine testing offers a longer window. Samples collected within 120 hours (5 days) can still detect many substances, including benzodiazepines, especially when labs use sensitive testing methods. Standard immunoassay screens are less reliable and may miss benzodiazepines after just 2 to 3 days, so requesting advanced testing through a hospital or forensic examiner improves the chances of detection.
Psychological Recovery
Physical symptoms resolve in days. The psychological impact is less predictable, especially when drugging is connected to sexual assault. Survivors commonly experience PTSD symptoms including intrusive re-experiencing of the event (or the surrounding circumstances they do remember), anxiety, depression, and hypervigilance.
What makes drug-facilitated assault psychologically distinct is the role of impaired memory. Not knowing exactly what happened creates a specific kind of distress. Research published in the European Journal of Psychotraumatology found that survivors of drug-facilitated sexual assault showed a pattern of initially lower acute stress symptoms compared to other assault survivors, but their PTSD followed a more chronic course over time. In other words, the full psychological weight often builds gradually rather than hitting all at once.
Treatment tends to take longer as well. In one study, survivors of drug-facilitated assault attended an average of 12 to 15 psychotherapy sessions, compared to 10 sessions for survivors of non-drug-facilitated assault. Researchers noted that PTSD from these experiences can be more resistant to treatment, partly because the fragmented memory complicates standard trauma processing techniques that rely on constructing a coherent narrative of the event.
Survivors with impaired memory did show somewhat fewer hyperarousal symptoms (the constant feeling of being on edge), but re-experiencing symptoms, including flashbacks and intrusive thoughts about what they do remember, were just as intense as in survivors with full recall. Depression levels were similarly high across all groups studied.
There is no fixed timeline for psychological recovery. Some people stabilize within weeks with support. Others find symptoms emerging or worsening months later, particularly if they initially minimized the experience or didn’t recognize what happened to them right away.