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Summary sheet: Benzydamine
Chemical Nomenclature
Common names Benzydamine, Tantum Verde
Substitutive name Benzydamine
Systematic name 3-(1-Benzyl-1H-indazol-3-yloxy)-N,N-dimethylpropan-1-amine
Class Membership
Psychoactive class Deliriant / Stimulant
Chemical class Indazole
Routes of Administration


Threshold 0.25 g
Light 0.5 - 1 g
Common 1 - 1.5 g
Strong 1.5 - 2 g
Heavy 2 g +
Total 5 - 8 hours
Onset 20 - 60 minutes
Peak 3 - 6 hours
Offset 3 - 8 hours



Benzydamine (also known as Difflam or Tantum Verde) is a topical anaesthetic of the indazole chemical class. It is sometimes found in small doses in over-the-counter products used to treat sore throats. In Germany and Poland, it is sold as a vaginal douching agent under the brand name Tantum Rosa. This product is also easily accessible across the world through the use of online stores such as eBay.

Alternatively, benzydamine can be used as a powerful psychoactive hallucinogen for recreational purposes. In high doses, it acts as a unique deliriant and CNS stimulant.[1] Such use, particularly among teenagers, has been reported in Poland,[1] Brazil[2][3] and Romania.


Benzydamine, or 3-(1-benzylindazol-3-yl)oxy-N,N-dimethylpropan-1-amine, is a synthetic benzyl-indazole molecule. Benzydamine contains a benzene and pyrazole ring fused to form a bicyclic indazole group. A benzyl substituent C6H5CH2- is bound to R1 of the indazole ring. This indazole ring is also substituted at R3 with an ether chain consisting of the oxygen group bonded to a propyl amine chain. The terminal amine RN of this structure is substituted with two methyl groups (dimethyl). Benzydamine is produced as a hydrochloride salt.


Benzydamine is a locally acting nonsteroidal anti-inflammatory drug with local anaesthetic and analgesic properties. Unlike other NSAIDs, it does not inhibit cyclooxygenase or lipooxygenase and is not ulcerogenic.

In terms of the pharmacology behind its hallucinogenic effects, this aspect of benzydamine remains unstudied and is subject to much speculation.

Benzydamine has a powerful reinforcing effect and that this effect is greatly facilitated in animals that already had substance experience, having previously self-administered heroin and cocaine, indicating cross sensitization between benzydamine and other common drugs of abuse. Benzydamine dose-dependently reduced both field excitatory post synaptic potential amplitude and paired pulse ratio, suggesting a presynaptic mechanism of action. Similarly to the in vivo paradigm, also the electrophysiological effects of benzydamine were potentiated in slices from animals that had undergone cocaine and heroin self-administration. Furthermore, benzydamine-induced Long Term Depression (LTD)-like responses in the prelimbic cortex-to-nucleus accumbens circuitry were significantly reduced in the presence of the CB1 receptor antagonist AM251. These findings provide firm evidence of the abuse liability of benzydamine and suggest a possible cannabinoidergic mechanism of action.[4]

Subjective effects

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Experience reports


Additional experience reports can be found here:

Toxicity and harm potential

The vaginal douching agents such as Tantum Rosa and other products consistently contain large amounts of salt which, if consumed, can cause serious kidney damage.

The toxicity and long-term health effects of recreational benzydamine use do not seem to have been studied in any scientific context and the exact toxic dose is unknown. This is because benzydamine is a research chemical with very little history of human usage. Anecdotal evidence from people within the psychonaut community who have tried benzydamine suggests that there are no negative health effects attributed to simply trying the drug by itself at low to moderate doses and using it very sparingly (but nothing can be completely guaranteed). Independent research should always be done to ensure that a combination of two or more substances is safe before consumption.


Benzydamine is usually extracted from Tantum Rosa douching agents which are available online. In order to consume the substance safely, one must first remove the dangerous levels of salt contained within the sachet. This can be done by dissolving the substance in a small amount of water (25ml/sachet). After the substance has mostly dissolved after stirring (warm or just boiled water works best as the salt will dissolve more easily), wait 10 minutes. After 10 minutes has past the benzydamine should have formed a layer on the top and the salt have settled at the bottom. The benzydamine should be filtered out using filter paper but do not pour the salt that may settle at the bottom as this will simply add back most of the salt you have tried to remove. It is best to consume the remaining paste by stirring it into very strong squash and drinking it.

Legal status

Benzydamine is legal and available in over-the-counter preparations in most parts of the world.

See also

External links


  1. 1.0 1.1 Recreational abuse with benzydamine hydrochloride (tantum rosa) ( / NCBI) |
  2. Recreational use of benzydamine as a hallucinogen among street youth in Brazil ( / NCBI) |
  3. Use abusive of benzydamine in Brazil: an overview in pharmacovigilance ( / NCBI) |
  4. Intravenous self-administration of benzydamine, a non-steroidal anti-inflammatory drug with a central cannabinoidergic mechanism of action. ( / NCBI) |