Prolintane
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Prolintane is a synthetic stimulant of the pyrrolidine class. It belongs to the same chemical family as pyrovalerone and the synthetic cathinones, and shares its core brain mechanism with methylphenidate. It raises dopamine and norepinephrine by blocking their reuptake, producing the focused wakefulness characteristic of catecholaminergic stimulants.[1]
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Synthesized in the 1950s by Thomae, a German firm later absorbed into Boehringer Ingelheim, as a milder amphetamine alternative. It was sold across Europe as Katovit and Villescon for fatigue and ADHD, until abuse concerns led to market withdrawal by 2001. Since the mid-2010s it has circulated on research chemical markets[2] and remains unscheduled in most jurisdictions, though banned from athletic competition.[3]
Subjective effects include wakefulness, sharper focus, mood elevation, appetite suppression, and mild euphoria. The experience is functional rather than euphoric — closer to Methylphenidate than cocaine, a clean, focused alertness without strong stimulant intensity.[4] Insomnia, nervousness, irritability, and a persistent compulsive redosing urge are the characteristic unwanted effects.[5]
Prolintane carries moderate dependence potential, and high doses can produce psychosis, dangerous heart rhythms, and death. The cardiac risk is the most acute: prolintane disrupts an electrical channel in the heart,[6] and combining it with serotonin-affecting substances can trigger a life-threatening overheating and seizure response. The evidence base is thin — no controlled human toxicity studies exist, and a serotonin-releasing effect only discovered in 2025 means prior safety assessments likely underestimated interaction risks.[1]
History[edit]
Discovery
Prolintane was synthesized in the 1950s by Thomae, a German pharmaceutical company later absorbed into Boehringer Ingelheim.[7] The goal was an amphetamine structural analog with milder adverse effects. Patents were filed in Germany (1956) and the United Kingdom (1959).
Clinical use
Boehringer Ingelheim marketed it across Europe as Villescon for fatigue and weakness,[8] while Spain's FHER sold inexpensive over-the-counter tablets as Katovit — prolintane combined with vitamins.[9] Clinical indications expanded to include ADHD, narcolepsy, orthostatic hypotension, and depression across Europe, South Africa, and Australia.[5]
Withdrawal and modern use
Katovit was withdrawn from the Spanish market in 2001 due to abuse concerns,[8][7] and broader medical use was discontinued as abuse liability became recognized.[1] Prolintane has reappeared on research chemical markets since the mid-2010s.[2]
Prolintane's cultural reputation centers on the Katovit brand — cheap, vitamin-fortified tablets that circulated as a stimulant at rave parties in southern Europe before withdrawal.[9] Martinez-Mir et al. described it as a "masked amphetamine," reflecting its ability to pass as a benign vitamin supplement.[10] It is also prohibited under WADA's S6 Stimulants category[3] and banned by the NCAA.[11]
Chemistry[edit]
Structural class
Prolintane belongs to the pyrrolidine stimulant family, sharing its core scaffold with pyrovalerone and the synthetic cathinones. It is the des-keto parent of pyrovalerone — the difference is the absence of a carbonyl group at the benzylic position.[12] This places it structurally between classical amphetamine analogs and the newer pyrovalerone-type compounds.
Molecular structure
| Molecular formula | C₁₅H₂₃N |
| Molecular weight | 217.35 g/mol |
Stereochemistry
The molecule has one chirality center and is studied and sold as a racemate — a 50/50 mix of both mirror-image forms.[13] No published data establish whether one form is more active than the other. Katovit tablets contained prolintane as the hydrochloride salt.[9]
Pharmacology[edit]
Mechanism of action
Prolintane blocks the transporters that clear dopamine and norepinephrine from synapses, keeping both active longer.[1][14] This mechanism is shared with cocaine and methylphenidate — slowing reuptake rather than triggering the direct release that amphetamine produces.
A 2025 study found prolintane also triggers serotonin release at human serotonin transporters.[1] This effect was absent in rat tissue — meaning decades of rodent studies missed it entirely. The serotonin effect is roughly ten times weaker than the dopamine effect, but it significantly changes the risk of dangerous drug interactions.
Pharmacokinetics
No human pharmacokinetic studies have been published. Metabolism proceeds through oxidation of the pyrrolidine ring.[15] After oral dosing, onset is 20–60 minutes, effects peak around 2–3 hours,[16] and total duration runs 4–6 hours.[17] REM sleep suppression is concentrated in the first 2 hours after dosing.[18]
Neuroscience[edit]
Where it acts
Prolintane elevates dopamine in the brain's mesolimbic reward circuit — the pathway that drives stimulant craving and reinforcement.[4] In the prefrontal cortex, raised dopamine and norepinephrine support sharper attention, consistent with improved sustained focus observed at 2.5 hours in human studies.[16]
Why it matters
Blocking dopamine reuptake amplifies the brain's "wanting" signal — the drive to seek the drug — without producing proportional euphoria.[4] This dissociation may explain prolintane's pattern of compulsive redosing without extreme pleasure. Repeated exposure in rodents also produces progressively amplified dopamine responses and markers of brain inflammation[6] — patterns linked to escalating use.
The most significant open question is prolintane's serotonin-releasing activity, identified only at human transporters in 2025.[1] Whether this affects subjective experience, cardiovascular risk, or interaction profiles is entirely unstudied. The rodent neuroinflammation findings[6] also leave open whether chronic exposure produces lasting brain damage in humans.
Subjective Effects[edit]
Prolintane produces clean, sustained stimulation with a strongly cognitive character — wakefulness, mental clarity, and mild mood lift without the peripheral intensity or euphoric surge of stronger stimulants. The experience feels purposeful rather than recreational, and at common doses many users describe minimal awareness of intoxication.
Among stimulants, prolintane sits between methylphenidate and cocaine in reinforcing strength — more rewarding than methylphenidate in animal models, but producing only partial cocaine-like effects in controlled tests.[4] The closest functional comparison is methylphenidate: cognitively focused, mildly stimulating, and notably clean at moderate doses.[16]
Effect Grid
Common doses produce clear stimulation with noticeable focus enhancement, thought acceleration, and wakefulness. Cognitive throughput improves measurably — controlled studies confirm significant performance gains on cognitive tasks at the lower end of this range. Mood elevation becomes apparent, though cognitive euphoria remains moderate rather than intense. The compulsive redosing urge may emerge at this level.
Physically, appetite suppression becomes pronounced. Stimulation is clear but typically smooth rather than jittery. Dose-dependent REM suppression intensifies — at 15-30 mg, both delayed REM onset and reduced total REM sleep are documented, with increased awakenings during early-night sleep.
Functional impairment is minimal during the active period, but insomnia is likely if taken within 6 hours of intended sleep. The 4-6 hour total duration is manageable for daytime use.
Modeled from the effect's dose-dependence curve — not per-substance measurements.
Pupil dilation · Muscle tension · Restlessness · Dry mouth · Insomnia · Dehydration sensation · Heart rate perception changes · Physical fatigue · Excessive sweating · Headache · Sexual arousal enhancement · Bruxism · Abnormal heartbeat · Involuntary body movements · Dizziness · Nausea · Trembling · Diarrhea
Dry mouth · Insomnia · Dehydration sensation · Heart rate perception changes · Physical fatigue · Excessive sweating · Headache · Sexual arousal enhancement · Bruxism · Involuntary body movements · Dizziness · Nausea · Trembling · Diarrhea
Motivation enhancement · Cognitive fatigue · Thought organization · Information processing enhancement · Analysis enhancement · Motivation suppression · Creativity enhancement · Thought deceleration · Thought disorganization
Analysis enhancement · Motivation suppression · Creativity enhancement · Thought deceleration · Thought disorganization
Anhedonia · Dysphoria
Flow state · Sociability enhancement
Timeline
Gradual awareness of mild stimulation and emerging wakefulness. Subtle shift in baseline alertness without clear cognitive effects.
Stimulation builds steadily. Focus sharpens, mood elevates, and cognitive throughput begins to improve. Physical restlessness may begin.
Maximum stimulation with clear focus enhancement, thought acceleration, appetite suppression, and sustained wakefulness. Cognitive performance measurably improved at therapeutic doses.
Stimulation gradually declines. Residual wakefulness persists while focus and mood elevation recede. Irritability or restlessness may surface.
Residual cognitive fatigue, potential dysphoria, and lingering appetite changes. Insomnia may persist if taken late in the day.
⚠ Avoid driving during this period — residual cognitive fatigue and impaired reaction time may persist for several hours after subjective stimulation has resolved.
Safety[edit]
- Acute toxicity
- Moderate
- Chronic toxicity
- Moderate
- Withdrawal
- Mild
- Tolerance buildup
- moderate
- Tolerance reset
- 14 days
- Physical
- Low
- Psychological
- Moderate
- Compulsive redosing
- Moderate
- Dose escalation
- Moderate
- Cross-tol.
- cocaine · methylphenidate · pyrovalerone
Toxicity
Acute toxicity
No published lethal dose exists for prolintane in any species, and no controlled human toxicity data have been collected.safety citation needed Documented overdose cases — reporting hallucinations, psychosis, and death — all involved multiple substances simultaneously, making prolintane's individual contribution impossible to isolate.[5]
Cardiovascular effects
Prolintane blocks a potassium channel in the heart that regulates its electrical rhythm.[6] This can prolong the QT interval — an electrical change that creates risk of a dangerous, potentially fatal irregular heartbeat. At therapeutic doses the cardiac effect appears minimal,[16] but risk rises sharply at higher amounts.
Neurotoxicity
Rodent studies show brain inflammation — activation of immune cells in the brain — along with reduced motor coordination following prolintane administration.[6] No human neurotoxicity data exist.
Chronic toxicity
No published studies have examined organ damage, cognitive decline, or cardiovascular changes from repeated prolintane use in humans or animals.safety citation needed
Pregnancy
Prolintane was detected in a case involving fetal death in the womb.[5] Multiple other substances were also present, so causal attribution is not possible. No reproductive safety or developmental toxicity data exist, and prolintane should not be assumed safe in pregnancy.safety citation needed
Psychological risks
High doses can produce hallucinations and psychosis.[5] Hallucinations have also developed at therapeutic doses when prolintane was combined with diphenhydramine over two months — a sign of progressive dopamine pathway sensitization.[19]
REM sleep is suppressed by prolintane,[20] meaning sleep quality may remain impaired after the stimulant effect fades. Insomnia, nervousness, and irritability are documented side effects even at therapeutic doses.[5]
Tolerance and dependence
No human tolerance or dependence studies exist. In rodents, prolintane produces compulsive use behaviors and dopamine pathway sensitization, but at lower levels than methamphetamine.[4] Its market withdrawal was explicitly driven by abuse liability concerns.[1]
Post-use fatigue, low mood, and reduced motivation are expected during recovery, by analogy with cocaine and methylphenidate, though no prolintane-specific withdrawal data exist.
Drug interactions
Tramadol
Tramadol blocks serotonin and norepinephrine reuptake alongside weak opioid activity. Combined with prolintane's norepinephrine blockade and serotonin-releasing activity,[1] the combination produces compounded serotonin excess — a potentially life-threatening overheating and seizure response. Tramadol also lowers the seizure threshold, which stimulant co-administration worsens. Deaths have been documented from tramadol combined with serotonergic agents.[21][22]
MDMA
MDMA releases serotonin, dopamine, and norepinephrine and can cause dangerous overheating and serotonin crisis at high doses.[23] Combined with prolintane, the mixture amplifies both cardiovascular strain and serotonin excess. Both substances raise body temperature; the risk compounds sharply in warm environments.
Diphenhydramine
Therapeutic-dose combination of prolintane and diphenhydramine produced hallucinations in one documented case after two months of concurrent use.[19]
QT-prolonging agents
Given prolintane's documented disruption of the heart's electrical channel,[6] combining it with other QT-prolonging drugs — certain antibiotics, antipsychotics, methadone — adds to the risk of a dangerous irregular heartbeat.safety citation needed
Contraindications
Heart rhythm disorders (absolute): Prolintane disrupts the heart's electrical channel in rodent models.[6] Pre-existing long QT syndrome is an absolute contraindication.
Concurrent QT-prolonging medication (absolute): Additive disruption of cardiac electrical channels makes concurrent use with other QT-prolonging agents contraindicated.safety citation needed
Pregnancy (absolute): Prolintane was detected in a case of fetal death.[5] No reproductive safety data exist.
Psychotic disorders (relative): Hallucinations and psychosis are documented overdose outcomes,[5] and hallucinations have occurred at therapeutic doses in combination with diphenhydramine.[19]
Concurrent serotonergic medication (relative to absolute): Prolintane releases serotonin at human transporters,[1] creating risk of a life-threatening serotonin overload response with SSRIs, SNRIs, MAOIs, tramadol, or other serotonergic agents.
Seizure disorders (relative): Stimulants as a class may lower the seizure threshold.inferred
Cardiovascular disease (relative): Therapeutic doses produced minimal cardiovascular effects,[16] but cardiac channel disruption data warrant caution with pre-existing heart conditions.
Harm Reduction[edit]
Forms & Identification
Prolintane circulates primarily as a white to off-white powder on research chemical markets. The historical pharmaceutical form — Katovit tablets — is no longer manufactured. Because prolintane is rare in unregulated supply, the primary identification concern is confirming the substance is actually prolintane and not a more potent stimulant or cathinone. Laboratory drug checking provides the most reliable identification.
Guidelines
- Start at the lowest reported active dose and wait at least 90 minutes before considering redosing — onset can be gradual.
- Weigh doses with a milligram-scale balance. Volumetric dosing in solution is an alternative for small quantities.
- Avoid redosing. Prolintane's moderate wanting signal can drive compulsive redosing without matching euphoria, leading to cumulative cardiovascular strain and insomnia.
- Do not use within 6 hours of intended sleep.
- Stay hydrated but do not overhydrate — stimulants can mask thirst and fatigue cues.
- Have food available for the post-experience period; appetite suppression during use is common with stimulants.
Set & Setting
Prolintane's functional character makes it less context-sensitive than psychedelics, but anxiety-prone individuals or those in high-stress situations may find stimulant effects amplified into restlessness and irritability. Evening use risks disrupted sleep architecture due to confirmed REM suppression.[20]
Aftercare & integration. The comedown from prolintane may bring fatigue, low mood, and irritability as dopamine and norepinephrine levels normalize. Sleep is a priority — confirmed REM suppression means sleep quality may be reduced even after stimulant effects have faded.
Eat a nutritious meal, hydrate, and avoid caffeine or other stimulants for 24 hours. If compulsive redosing occurred during use, reflect on the pattern before the next opportunity — prolintane's moderate wanting signal can establish habits without the progression being obvious.
Recovery & Support
Prolintane's moderate reinforcing potential means habitual use can develop gradually. If use has become compulsive or is affecting daily functioning, professional support is warranted. Stimulant-specific counseling, cognitive behavioral therapy, and peer support groups (such as SMART Recovery or Narcotics Anonymous) are applicable. No prolintane-specific withdrawal protocols exist — treatment follows general stimulant use disorder guidelines.
Recovery resources, crisis lines, and support pathways → View all
Emergency Response
Recognizing an emergency:
- Chest pain, rapid or irregular heartbeat
- Seizure or loss of consciousness
- Severe agitation, paranoia, or hallucinations that cannot be talked through
- Body temperature that feels dangerously hot to the touch
- Confusion or inability to follow simple instructions
Immediate steps:
- 1. Call emergency services immediately if any of the above are present.
- 2. Move the person to a cool, quiet environment.
- 3. Do not restrain unless there is immediate danger of self-harm.
- 4. If unconscious but breathing, place in the recovery position.
- 5. Do not induce vomiting.
- 6. Stay with the person until help arrives.
What to tell the dispatcher: Name the substance (prolintane, a stimulant), approximate amount and time of ingestion, and current symptoms. Good Samaritan laws in many jurisdictions protect people who call for help during a drug emergency.
Legal Status[edit]
Prolintane is not specifically scheduled in most major jurisdictions but has been withdrawn from pharmaceutical markets and is prohibited in athletic competition.
| Jurisdiction | Classification | Key provisions |
|---|---|---|
| United States | Not scheduled under the Controlled Substances Act; not FDA-approved | No specific federal scheduling. Prohibited in athletic competition by WADA and NCAA.[11][3] The Federal Analogue Act may apply if sold for human consumption. |
| United Kingdom | Covered by Psychoactive Substances Act 2016 | Not specifically scheduled under the Misuse of Drugs Act 1971. The PSA makes production, supply, and importation of psychoactive substances illegal, effectively prohibiting commercial distribution.citation needed |
| Australia | Schedule 4 (Prescription Only) | Formerly prescribed for fatigue and ADHD. Currently classified as prescription-only under the Therapeutic Goods Act.citation needed |
| Germany | Prescription-only | Listed in Anlage 1 AMVV (Arzneimittelverschreibungsverordnung), restricting availability to prescription dispensing.citation needed |
| Spain | Withdrawn from market | Katovit withdrawn in 2001 due to safety and abuse concerns.[8][7] No longer commercially available. |
| Canada | Status not established | No data found regarding prolintane's status under the Controlled Drugs and Substances Act (CDSA) or provincial pharmacy regulations.citation needed |
| WADA | Prohibited in competition | Listed under S6 Stimulants category on the WADA Prohibited List.[3] |
Legal status changes frequently and varies by jurisdiction. This page does not constitute legal advice.
Analog act considerations
In the United States, prolintane's structural similarity to pyrovalerone — a Schedule V controlled substance — may bring it within the scope of the Federal Analogue Act (21 U.S.C. § 813). This law treats substances structurally similar to Schedule I or II compounds as Schedule I when intended for human consumption. Whether prolintane meets the threshold for analog prosecution has not been tested in court.citation needed
references
- [1] ^abcdefghiKastner N, Islam MN, Dybek M, Roth E, Heisinger S, Holy M, Jäntsch K, Walther D, Stockner T, Baumann MH, Brandt SD, Wallach J, Sitte HH, Kudlacek O (2025) Prolintane analogs as hybrid monoamine transporter ligands: Structural determinants and species differences. — The Journal of Biological Chemistry doi:10.1016/j.jbc.2025.110903
- [2] ^abNapoletano F, Schifano F, Corkery JM, Guirguis A, Arillotta D, Zangani C, Vento A (2020) The Psychonauts' World of Cognitive Enhancers — Frontiers in Psychiatry doi:10.3389/fpsyt.2020.546796
- [3]
- [4]
- [5]
- [6]