Absorption, Distribution and Excretion
Oral doses of benzydamine are well absorbed and plasma drug concentrations reach a peak fairly rapidly and then decline with a half-life of approximately 13 hours. When applied topically, although the local drug concentrations are relatively large, the systemic absorption of topically applied benzydamine is relatively low compared to oral doses. This low topical absorption contributes to a decreased potential for any systemic drug side-effects when benzydamine is administered in this way.
The relatively high lipid solubility of the weak base benzydamine is thought to be associated with considerable passive resorption within the renal tubule, which suggests that only approximately 5% of benzydamine is excreted unchanged in the urine. At the same time however, other studies have suggested that considerably larger amounts (50-65%) of the drug is excreted unchanged in urine. While several inactive oxidized metabolites of benzydamine are excreted in urine, the benzydamine N-oxide metabolite can remain in plasma and demonstrate a half-life that is longer than the parent benzydamine compound. Nevertheless, it is generally believed that excretion occurs mainly through urine and is mostly in the form of inactive metabolites or conjugation products.
The volume of distribution of benzydamine is 10 L.
Benzydamine demonstrateas a systemic clearance of 170 ml/min.

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Metabolism / Metabolites
Benzydamine is primarily metabolized by oxidation, dealkylation, and conjugation into hydroxy, dealkylated, and N-oxide metabolites. In general, however, when used at the recommended doses the levels at which benzydamine is absorbed or exposed into the body are usually not sufficient to produce systemic pharmacological effects [L

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Biological Half-Life
Approximately 13 h after oral administration, with a terminal half life of about 7.7 h.

Protein Binding
Benzydamine exhibits < 20% plasma protein binding after oral administration.

[1]. Recreational abuse with benzydamine hydrochloride (tantum rosa). Clin Toxicol (Phila). 2007;45(2):198-9.

[2]. Recreational use of benzydamine as a hallucinogen among street youth in Brazil. Rev Bras Psiquiatr. 2009 Sep;31(3):208-13.

[3]. Use abusive of benzydamine in Brazil: an overview in pharmacovigilance. Cien Saude Colet. 2010 May;15(3):717-24.

[4]. Antimicrobial activity of benzydamine, a non-steroid anti-inflammatory agent. J Chemother. 1992 Dec;4(6):347-52.

Benzydamine is a member of the class of indazoles carrying benzyl and 3-(dimethylamino)propyl groups at positions 1 and 3 respectively. A locally-acting nonsteroidal anti-inflammatory drug that also exhibits local anaesthetic and analgesic properties. It has a role as a central nervous system stimulant, a non-steroidal anti-inflammatory drug, a hallucinogen, a local anaesthetic and an analgesic. It is a member of indazoles, an aromatic ether and a tertiary amino compound. It is a conjugate base of a benzydamine(1+).
Benzydamine (also known as Tantum Verde or Difflam), available as the hydrochloride salt, is a locally-acting nonsteroidal anti-inflammatory drug (NSAID) with local anaesthetic and analgesic properties. It is used topically for pain relief and anti-inflammatory treatment of the mouth, throat, or muscoskeletal system. Although the indazole analogue benzydamine is a non-steroidal anti-inflammatory drug (NSAID), it has various physicochemical properties and pharmacologic activities that are different from those of traditional aspirin-like NSAIDs but facilitate benzydamine's mechanism of action as an effective locally-acting NSAID with local anaesthetic and analgesic properties. Moreover, unlike aspirin-like NSAIDs which are acids or metabolised to acids, benzydamine is in fact a weak base.
A benzyl-indazole having analgesic, antipyretic, and anti-inflammatory effects. It is used to reduce post-surgical and post-traumatic pain and edema and to promote healing. It is also used topically in treatment of RHEUMATIC DISEASES and INFLAMMATION of the mouth and throat.

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Drug Indication
Available predominantly as a liquid mouthwash, oromucosal spray, or topical cream, benzydamine is most frequently employed as a locally acting analgesic and anti-inflammatory treatment for the relief of painful inflammatory conditions. When formulated as a mouthwash or spray, benzydamine may be used to treat traumatic conditions like pharyngitis following tonsillectomy or the use of a naso-gastric tube, inflammatory conditions like pharyngitis, aphthous ulcers and oral ulceration due to radiation therapy, dentistry operations and procedures, or more general conditions like sore throat, sore tongue, sore gums, mouth ulcers, or discomfort caused by dentures. When used as a topical cream, benzydamine may be employed to relieve symptoms associated with painful inflammatory conditions of the muscolo-skeletal system including acute inflammatory disorders such as myalgia and bursitis or traumatic conditions like sprains, strains, bruises, sore muscles, stiff joints, or even the after-effects of fractures.

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Mechanism of Action
Despite being categorized as a non-steroidal anti-inflammatory drug (NSAID), benzydamine demonstrates various mechanisms of action that differ from those of traditional aspirin-like NSAIDs. In particular, benzydamine predominantly acts by inhibiting the synthesis of pro inflammatory cytokines like tumour necrosis factor-alpha (TNF-α) and interleukin-1β (IL-1β) without largely affecting other pro inflammatory cytokines (ie. such as IL-6 and IL-8) or anti-inflammatory cytokines (ie. like IL-10 or IL-1 receptor antagonist). Moreover, benzydamine is largely a weak inhibitor of prostaglandin synthesis as it has been shown to effectively inhibit cyclooxygenase (COX) and lipoxygenase enzyme activity only at concentrations of 1mM or greater. Considering most contemporary usages of benzydamine are topical applications that are generally not well absorbed through the skin and/or non-specialized mucosae, benzydamine does not often achieve the kind of absorption or blood concentrations necessary to cause any extraneous distant systemic effects or COX inhibition, allowing it to localize its action. Additionally, it is also hypothesized that benzydamine is capable of inhibiting the oxidative burst of neutrophils and membrane stabilization. These actions are exhibited by the substance’s ability to inhibit the release of granules from neutrophils and to stabilize lysosomes. Furthermore, benzydamine is capable of a local anaesthetic effect that may be related to its capability for inhibiting the release of inflammatory mediators like substance P and calcitonin gene related peptide from sensory nerve endings. Since substance P is capable of causing the release of histamine from mast cells, benzydamine’s prevention of substance P release further contributes to an anti-inflammatory effect. Benzydamine also demonstrates a non-specific antibacterial activity against various bacterial strains that are resistant to broad-spectrum antibiotics such as ampicillin, chloramphenicol, and tetracycline at concentrations of about 3 mmol/L. Combinatorial use of benzydamine and other antibiotics like tetracycline and chloramphenicol are also synergistic against antibiotic resistant strains of *Staphylococcus aureus* and *Pseudomonas aeruginosa*.

C19H24CLN3O

345.871

345.16

132-69-4

132-69-4 (HCl);642-72-8;

12555

White to off-white solid powder

474.4ºC at 760 mmHg

147-153ºC

240.7ºC

3.64E-09mmHg at 25°C

4.217

0

3

7

23

344

0

CNBGNNVCVSKAQZ-UHFFFAOYSA-N

InChI=1S/C19H23N3O/c1-21(2)13-8-14-23-19-17-11-6-7-12-18(17)22(20-19)15-16-9-4-3-5-10-16/h3-7,9-12H,8,13-15H2,1-2H3

3-(1-benzylindazol-3-yl)oxy-N,N-dimethylpropan-1-amine

Benzydamine Hydrochloride CAM-2028 AF-864

2934.99.9001

Powder      -20°C    3 years

                     4°C     2 years

In solvent   -80°C    6 months

                  -20°C    1 month

Note: Please store this product in a sealed and protected environment, avoid exposure to moisture.

Room temperature (This product is stable at ambient temperature for a few days during ordinary shipping and time spent in Customs)

H2O : ≥ 41 mg/mL (~118.54 mM)

Solubility in Formulation 1: 100 mg/mL (289.13 mM) in PBS (add these co-solvents sequentially from left to right, and one by one), clear solution; with sonication.

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 (Please use freshly prepared in vivo formulations for optimal results.)