Benzocaine CAS 94-09-7

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Benzocaine CAS 94-09-7

Benzocaine CAS 94-09-7, a local anesthetic with high quality, hot selling in Europe, USA

CAS 94-09-7 Basic Parameter

Product Name Benzocaine
Synonyms 4-Aminobenzoic Acid Ethyl Ester;BENZOCAINUM;ETHYL 4-AMINOBENZOATE;ETHYLAMINOBENZOATE-4;H-4-ABZ-OET;ORTHESIN;P-AMINOBENZOIC ACID ETHYL ESTER;4-(Ethoxycarbonyl)aniline;4-amino-benzoicaciethylester;4-Carbethoxyaniline
CAS NO 94-09-7
Molecular Formula C9H11NO2
Molecular Weight 165.19
Melting point 88-90 °C
Boiling Point 172 °C (12.7517 mmHg)
Flash Point 172°C/13mm
Density 1.17g/cm3
Assay 99%
Grade Pharmaceutical Grade
Solubility Soluble in ethanol, chloroform, ethyl ether and dilute acids. Sparingly soluble in water
Appearance White Crystalline Powder

Benzocaine Picture

benzocaine, cas 94-09-7, local anesthetic

What is Benzocaine?

Benzocaine, sold under the brand name Orajel amongst others, is a local anesthetic, belonging to the amino ester drug class, commonly used as a topical painkiller or in cough drops. It is the active ingredient in many over-the-counter anesthetic ointments such as products for oral ulcers. It is combined with antipyrine to form A/B ear drops. In the US, products containing benzocaine for oral application are contraindicated in children younger than two years old. In the European Union, the contraindication applies to children under 12 years of age.

Medical Uses

Benzocaine is indicated to treat a variety of pain-related conditions. It may be used for:

  • Local anesthesia of oral and pharyngeal mucous membranes (sore throat, cold sores, mouth ulcers, toothache, sore gums, denture irritation)
  • Otic pain (earache)
  • Surgical or procedural local anesthesia
  • Relief of skin pain caused by sunburn, ingrown toenails, hemorrhoids, 

Examples of combination medications of benzocaine include:

  • Antipyrine-benzocaine otic consists of antipyrine and benzocaine, and is used to relieve ear pain and remove earwax.
  • Cepacol consists of menthol and benzocaine, and is used to treat sore throat.A solution of benzocaine and menthol is marketed for the treatment of bee stings, mosquito bites, jellyfish stings, and other insect bites

Other uses

Benzocaine is used as a key ingredient in numerous pharmaceuticals:

  • Some glycerol-based ear medications for use in removing excess wax as well as relieving ear conditions such as otitis media and swimmer’s ear.
  • Some previous diet products such as Ayds.
  • Some condoms designed to prevent premature ejaculation. Benzocaine largely inhibits sensitivity on the penis, and can allow for an erection to be maintained longer (in a continuous act) by delaying ejaculation. Conversely, an erection will also fade faster if stimulus is interrupted.
  • Benzocaine mucoadhesive patches have been used in reducing orthodontic pain.
  • In Poland it is included, together with menthol and zinc oxide, in the liquid powder (not to be confused with the liquid face powder) used mainly after mosquito bites. Today’s ready-made Pudroderm was once used there as pharmaceutical compound.


Benzocaine is the ethyl ester of p-aminobenzoic acid (PABA). It can be prepared from PABA and ethanol by Fischer esterification or via the reduction of ethyl p-nitrobenzoate. Benzocaine is sparingly soluble in water; it is more soluble in dilute acids and very soluble in ethanol, chloroform, and ethyl ether. The melting point of benzocaine is 88–92 °C, and the boiling point is about 310 °C. The density of benzocaine is 1.17 g/cm3.

Benzocaine is commonly found, particularly in Britain, as an additive in street cocaine and also as a bulking agent in “legal highs”. Benzocaine gives a numbing effect similar to cocaine and as a bulking and binding agent it can not be detected once mixed. It is the most popular cutting agent worldwide.

Treatment of benzocaine with hydrazine leads to aminostimil, a compound related to isoniazid.


Benzocaine can be prepared by esterification using 4-aminobenzoic acid and ethanol. It can also be prepared by reduction of ethyl 4-nitrobenzoate to the amine. In industrial practice, the reducing agent is usually iron and water in the presence of a little acid.

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