From PsychonautWiki
Jump to navigation Jump to search

Skull and crossbones darktextred2.png

Death may result when opiates are combined with other depressants such as benzodiazepines, barbiturates, gabapentinoids, thienodiazepines, alcohol or other GABAergic substances.[1]

It is strongly discouraged to combine these substances, particularly in common to heavy doses.

Summary sheet: Dextropropoxyphene
Chemical Nomenclature
Common names Dextropropoxyphene, propoxyphene, Darvon
Systematic name [(2S,3R)-4-(dimethylamino)-3-methyl-1,2-diphenylbutan-2-yl] propanoate
Class Membership
Psychoactive class Opioid
Chemical class Propionate
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.

Bioavailability 40%
Threshold 15 - 30 mg
Light 30 - 65 mg
Common 65 - 100 mg
Strong 100 - 200 mg
Heavy 200 mg +
Onset 20 - 30 minutes
Peak 1 - 4 hours
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.

Serotonin releasers
Selective serotonin re-uptake inhibitors
Serotonin-norepinephrine reuptake inhibitors

Dextropropoxyphene (also known as Propoxyphene and Darvon) is a synthetic opioid of the propionate chemical class. Like other substances in its class, particularly tapentadol and tramadol, it produces mild euphoric, analgesic, sedative and antitussive effects when administered (typically orally, but sometimes intravenous or rectally).[citation needed] Notably, it is reported to produce significantly less euphoria in comparison to other opioids.[citation needed]

Dextropropoxyphene was first patented in 1955 and subsequently manufactured by Eli Lilly and Company.[citation needed]

Due to its euphoric and analgesic effects, dextropropoxyphene is known to be habit forming, albeit not to the same extent as other opioids such as morphine or heroin.[citation needed] Notably, dextropropoxyphene is also known to cause seizures and potentially fatal cardiac arrhythmia at high doses[citation needed], which are not able to be reversed by naloxone.[citation needed]

Today, dextropropoxyphene is rarely encountered on the streets and is sometimes obtained by prescription from a compounding pharmacy.[citation needed] It is strongly recommended that one research this substance's toxicity and use proper harm reduction practices if choosing to use this substance.


Dextropropoxyphene is similar in structure to tapentadol. While tapentadol has an ethyl substitution on the gamma-carbon, dextropropoxyphene instead has both benzyl and propionyl substitutions. Dextropropoxyphene also contains a benzene ring in place of the phenol ring found in tapentadol. The empirical formula of dextropropoxyphene is C22H29NO2 and has a molar mass of 339.471 grams per mole.


Opioids produce their effects by binding to and activating the μ-opioid receptor. This occurs because opioids structurally mimic endogenous endorphins which are naturally found within the body and also work upon the μ-opioid receptor set. The way in which opioids structurally mimic these natural endorphins results in their euphoria, pain relief and anxiolytic effects. This is because endorphins are responsible for reducing pain, causing sleepiness, and feelings of pleasure. They can be released in response to pain, strenuous exercise, orgasm, or general excitement.

Unlike most opioids, dextropropoxyphene is also a weak serotonin reuptake inhibitor as well as a potent nicotinic acetylcholine antagonist[2]. Dextropropoxyphene has a bioavailability of about 40% and is metabolized by the cytochrome P450 3A4 enzyme. The optical isomer of dextropropoxyphene, levopropoxyphene has no analgesic activity but retains antitussive effects.

Subjective effects

The effects listed below are based upon the subjective effects index and personal experiences of PsychonautWiki contributors. These effects should be taken with a grain of salt and will rarely (if ever) occur all at once, but heavier doses will increase the chances of inducing a full range of effects. Likewise, adverse effects become much more likely on higher doses and may include serious injury or death.

Physical effects

Cognitive effects

Experience reports

There are currently no anecdotal reports which describe the effects of this compound within our experience index. Additional experience reports can be found here:

Toxicity and harm potential

Dextropropoxyphene has a high toxicity relative to dose. As with all opioids, long-term effects can vary but can include diminished libido, apathy and memory loss. It is also potentially lethal when mixed with depressants like alcohol or benzodiazepines and generally has a wider range of substances which it is dangerous to combine with in comparison to other opioids. Dextropropoxyphene is known to lower the seizure threshold. It should not be taken during benzodiazepine withdrawals as this can potentially cause seizures. Dextropropoxyphene is known to cause potentially fatal heart arrhythmias, and it is discouraged to take in very heavy doses or several days in a row.

It is strongly recommended that one use harm reduction practices when using this drug.

Tolerance and addiction potential

As with other opioids, the chronic use of dextropropoxyphene can be considered moderately addictive with a high potential for abuse and is capable of causing psychological dependence among certain users. When addiction has developed, cravings and withdrawal symptoms may occur if a person suddenly stops their usage.

Tolerance to many of the effects of dextropropoxyphene develops with prolonged and repeated use. The rate at which this occurs develops at different rates for different effects, with tolerance to the constipation-inducing effects developing particularly slowly for instance. This results in users having to administer increasingly large doses to achieve the same effects. After that, it takes about 3 - 7 days for the tolerance to be reduced to half and 1 - 2 weeks to be back at baseline (in the absence of further consumption). Dextropropoxyphene presents cross-tolerance with all other opioids, meaning that after the consumption of dextropropoxyphene all opioids will have a reduced effect.

Dangerous interactions

Although many psychoactive substances are reasonably safe to use on their own, they can quickly become dangerous or even life-threatening when taken with other substances. The following lists some known dangerous combinations, but cannot be guaranteed to include all of them. Independent research should always be conducted to ensure that a combination of two or more substances is safe to consume. Some interactions listed have been sourced from TripSit.

  • Stimulants - It can be dangerous to combine depressants with stimulants due to the risk of accidental excessive intoxication. Stimulants mask the sedative effect of depressants, which is the main factor most people use to gauge their level of intoxication. Once the stimulant effects wear off, the effects of the depressant will significantly increase, leading to intensified disinhibition, motor control loss, and dangerous black-out states. This combination can also potentially result in severe dehydration if one's fluid intake is not closely monitored. If choosing to combine these substances, one should strictly limit themselves to a pre-set schedule of dosing only a certain amount per hour until a maximum threshold has been reached.

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.


  • Germany: Dextropropoxyphene is controlled under BtMG Anlage II, making it illegal to manufacture, import, possess, sell, or transfer it without a license.[4]
  • United States - Dextropropoxyphene is a Schedule II or Schedule IV Controlled Substance depending on the dosage and other ingredients.[5] Dextropropoxyphene has been withdrawn in the United States and is no longer available through prescription, although it is possible some compounding pharmacies may still carry it.
  • United Kingdom - Dextropropoxyphene is a Class C, Schedule 2 or Schedule 5 substance depending on the dose.[6]

See also

External links


  1. Risks of Combining Depressants (Tripsit) |
  2. Blockade of Rat α3β4 Nicotinic Receptor Function by Methadone, Its Metabolites, and Structural Analogs |
  3. Gillman, P. K. (2005). Monoamine oxidase inhibitors, opioid analgesics and serotonin toxicity. British Journal of Anaesthesia, 95(4), 434-441.
  5. DEA Controlled Drugs |
  6. Home Office Controlled Drugs |