From PsychonautWiki
Jump to navigation Jump to search

This page has not been fully approved by the PsychonautWiki administrators.

It may contain incorrect information, particularly with respect to dosage, duration, subjective effects, toxicity and other risks. It may also not meet PW style and grammar standards.

Summary sheet: Pentylone
Chemical Nomenclature
Common names Pentylone, βk-MBDP, bk-MBDP, bk-methyl-K
Substitutive name 3,4-Methylenedioxypentedrone
Systematic name 1-(2H-1,3-benzodioxol-5-yl)-2-(methylamino)pentan-1-one
Class Membership
Psychoactive class Stimulant / Entactogen
Chemical class Cathinone / MDxx
Routes of Administration

WARNING: Always start with lower doses due to differences between individual body weight, tolerance, metabolism, and personal sensitivity. See responsible use section.

Threshold 5 mg
Light 10 - 20 mg
Common 20 - 40 mg
Strong 40 - 80 mg
Heavy 80 mg +
Total 3 - 4 hours
Onset 20 - 40 minutes
After effects 1 - 6 hours

DISCLAIMER: PW's dosage information is gathered from users and resources for educational purposes only. It is not a recommendation and should be verified with other sources for accuracy.


Pentylone (also known as βk-MBDP and methylenedioxypentedrone) is a novel stimulant-entactogen substance of the cathinone class. Pentylone is chemically related to MDPV and belongs to a group known as the substituted cathinones. Little is known about its pharmacology, although it likely produces its activity by increasing the activity of serotonin, dopamine, and norepinephrine in the brain.[1]

Pentylone was developed in the 1960s by Boehringer Ingelheim,[1] although it was never marketed. It appeared around 2010 as recreational research compound, it is occasionally found as an adulterant or counterfeit for MDMA[1].

User reports indicate that Pentylone produces a mixture of classic stimulant and entactogenic effects resembling those of MDMA, methylone and cocaine. Commonly reported effects include stimulation, disinhibition, increased libido, compulsive redosing, and euphoria. Very little is known about pentylone at this time.

Pentylone is sold online as a research chemical alongside other synthetic cathinones like ethylone and dibutylone.[1] Due to the lack of research, it is highly advised to use harm reduction practices if using this substance.

History and culture

Pentylone is a synthetic cathinone. Synthetic cathinones were first synthesized in the late 1920s, starting with methcathinone and mephedrone. However, they did not find medical use due to their side effects. In the early 2000s, synthetic cathinones began to be sold in "head" shops and online as designer drugs, also known as research chemicals and "legal highs".[2] Their quasi-legality and ability to substitute for traditional stimulants like cocaine or amphetamine made them popular in certain demographics. Due to a history of being falsely marketed as bath salt products, they are referred in the media as "bath salts."

The synthesis of pentylone was first described in a patent filed by Boehringer Ingelheim in 1969. It was described alongside the synthesis of other novel central nervous system stimulants including butylone, dibutylone, and ephylone. However, its pharmacological properties were not tested and it was never marketed.


Pentylone is a synthetic substance belonging to a group known as substituted cathinones. Substituted cathinones are derivatives of the naturally occurring substance cathinone, which is one of the psychoactive principles in khat (Catha edullis). Cathinone is composed of a phenethylamine core with an alkyl group attached to the alpha carbon, and a ketone group attached to the beta carbon.

Pentylone is close structural relative of methylone, the beta ketone analog of MDMA. Pentylone's chemical structure consists of a cathinone core substituted with a methylenedioxy ring at R3 and R4 of the phenyl ring, a propyl group at the alpha carbon, and a methyl group at the amino group.


Very little data exists on the human pharmacokinetics and pharmacodynamics of pentylone and other substituted cathinones. Like amphetamines, synthetic cathinones exert their stimulating and sympathomimetic effects via increasing synaptic concentration of catecholamines such as dopamine, serotonin and norepinephrine. These molecules are able to inhibit monoamine reuptake transporters producing a decreased clearance of the neurotransmitters from the synapse. Furthermore, they may cause release of biogenic amines from intracellular stores.[3]

Synthetic cathinones are generally less able than amphetamines to cross the blood–brain barrier because the beta-keto group causes an increase in polarity. Unlike other synthetic cathinones, pyrrolidine derivatives have a higher ability to cross the blood–brain barrier because the pyrrolidine ring confers a low polarity to these molecules. The studies on the metabolism of synthetic cathinones have shown that they are N-demethylated, the keto group is reduced to hydroxyl and ring alkyl groups are oxidised.[4]

Subjective effects

This subjective effects section is a stub.

As such, it is still in progress and may contain incomplete or wrong information.

You can help by expanding or correcting it.

Compared to other stimulant-entactogens, pentylone is reported to be more stimulating than entactogenic. Entactogenic feelings are said to be weak compared to substances like MDMA, 6-APB or methylone. Pentylone is also described as less euphoric and satisfying than traditional entactogens. Reports suggest that the physical side effects increase disproportionately to the desirable effects, which may promote compulsive redosing.

Disclaimer: The effects listed below cite the Subjective Effect Index (SEI), an open research literature based on anecdotal user reports and the personal analyses of PsychonautWiki contributors. As a result, they should be viewed with a healthy degree of skepticism.

It is also worth noting that these effects will not necessarily occur in a predictable or reliable manner, although higher doses are more liable to induce the full spectrum of effects. Likewise, adverse effects become increasingly likely with higher doses and may include addiction, severe injury, or death ☠.

Physical effects

Visual effects

Cognitive effects

After effects
Aftereffects (3).svg

Experience reports

Anecdotal reports which describe the effects of this compound within our experience index include:

Additional experience reports can be found here:

Toxicity and harm potential


This toxicity and harm potential section is a stub.

As a result, it may contain incomplete or even dangerously wrong information! You can help by expanding upon or correcting it.
Note: Always conduct independent research and use harm reduction practices if using this substance.

Pentylone is a research chemical with a very short history of human usage. Very little is known about its long-term health effects and the exact toxic dosage is unknown.

However, numerous reports of hospitalizations and overdose deaths indicate that its analogue ephylone is extremely toxic at very high dosages.[5]

It is strongly advised to use harm reduction practices if using this substance.

Lethal dosage

The lethal dose for pentylone is currently unknown.

Tolerance and addiction potential

As with other stimulants, the chronic use of pentylone can be considered moderately addictive with a high potential for abuse. It is capable of causing psychological dependence among certain users. When addiction has developed, cravings and withdrawal effects will occur if one suddenly stops their use.

Tolerance to many of the effects of pentylone develops with prolonged and repeated use. This results in users having to administer increasingly large doses to achieve the same effects.

Dangerous interactions

Warning: Many psychoactive substances that are reasonably safe to use on their own can suddenly become dangerous and even life-threatening when combined with certain other substances. The following list provides some known dangerous interactions (although it is not guaranteed to include all of them).

Always conduct independent research (e.g. Google, DuckDuckGo, PubMed) to ensure that a combination of two or more substances is safe to consume. Some of the listed interactions have been sourced from TripSit.

Serotonin syndrome risk

Combinations with the following substances can cause dangerously high serotonin levels. Serotonin syndrome requires immediate medical attention and can be fatal if left untreated.

Legal status


This legality section is a stub.

As such, it may contain incomplete or wrong information. You can help by expanding it.

  • Brazil: As of September 7, 2018, all cathinone analogues are controlled substances considered illegal to possess, use and distribute. This was made possible due to a blanket ban law appended to Portaria SVS/MS nº 344.[8]
  • Canada: Pentylone is a banned substance.[citation needed]
  • Germany: Pentylone is controlled under Anlage I BtMG (Narcotics Act, Schedule I)[9] as of December 13, 2014.[10] It is illegal to manufacture, possess, import, export, buy, sell, procure or dispense it without a license.[11]
  • Sweden: Pentylone is a banned substance.[12]
  • Turkey: Pentylone is a classed as drug and is illegal to possess, produce, supply, or import.[13]
  • United Kingdom: Pentylone is a Class B controlled substance.[citation needed]
  • United States: On March 7, 2014, the DEA issued a temporary scheduling order to place pentylone in schedule I of the Controlled Substances Act (CSA).[14] This makes the production, sale, and possession of pentylone illegal.

See also

External links


  • Prosser, J. M., & Nelson, L. S. (2012). The toxicology of bath salts: a review of synthetic cathinones. Journal of Medical Toxicology, 8(1), 33-42.
  • Wood, M. R., Bernal, I., & Lalancette, R. A. (2017). The hydrochloride hydrates of pentylone and dibutylone and the hydrochloride salt of ephylone: the structures of three novel designer cathinones. Structural Chemistry, 28(5), 1369-1376.


  1. 1.0 1.1 1.2 1.3 Wood, M. R., Bernal, I., & Lalancette, R. A. (2017). The hydrochloride hydrates of pentylone and dibutylone and the hydrochloride salt of ephylone: the structures of three novel designer cathinones. Structural Chemistry, 28(5), 1369-1376.
  2. Coppola, M., & Mondola, R. (2012). Synthetic cathinones: chemistry, pharmacology and toxicology of a new class of designer drugs of abuse marketed as “bath salts” or “plant food”. Toxicology letters, 211(2), 144-149.
  3. Cozzi, N.V., Sievert, M.K., Shulgin, A.T., Jaco 3rd., P., Ruoho, A.E., 1999. Inhibition of plasma membrane monoamine transporters by beta-ketoamphetamines. Eur. J. Pharmacol. 381, 63–69.
  4. Meyer, M.R., Maurer, H.H., 2010. Metabolism of designer drugs of abuse: an updated review. Curr. Drug Metab. 11, 468–482
  5. Clinical Presentation, Autopsy Results and Toxicology Findings in an Acute Ephylone Fatality. ( / NCBI) |
  6. Talaie, H.; Panahandeh, R.; Fayaznouri, M. R.; Asadi, Z.; Abdollahi, M. (2009). "Dose-independent occurrence of seizure with tramadol". Journal of Medical Toxicology. 5 (2): 63–67. doi:10.1007/BF03161089. eISSN 1937-6995. ISSN 1556-9039. OCLC 163567183. 
  7. Gillman, P. K. (2005). "Monoamine oxidase inhibitors, opioid analgesics and serotonin toxicity". British Journal of Anaesthesia. 95 (4): 434–441. doi:10.1093/bja/aei210Freely accessible. eISSN 1471-6771. ISSN 0007-0912. OCLC 01537271. PMID 16051647. 
  8. New blanket ban on synthetic illegal drugs is approved (Portuguese) |
  9. "Anlage I BtMG" (in German). Bundesministerium der Justiz und für Verbraucherschutz. Retrieved December 19, 2019. 
  10. "Achtundzwanzigste Verordnung zur Änderung betäubungsmittelrechtlicher Vorschriften" (PDF) (in German). Bundesanzeiger Verlag. Retrieved December 19, 2019. 
  11. "§ 29 BtMG" (in German). Bundesministerium der Justiz und für Verbraucherschutz. Retrieved December 19, 2019. 
  12. Regulation prohibiting certain narcotics.
  13. Bakanlar Kurulu Kararı Karar Sayısı : 2013/4827 |
  14. Placement of 10 Synthetic Cathinones Into Schedule I |