Benzocain Chemische Eigenschaften,Einsatz,Produktion Methoden
R-Sätze Betriebsanweisung:
R43:Sensibilisierung durch Hautkontakt möglich.
R36/37/38:Reizt die Augen, die Atmungsorgane und die Haut.
S-Sätze Betriebsanweisung:
S22:Staub nicht einatmen.
S24/25:Berührung mit den Augen und der Haut vermeiden.
S37/39:Bei der Arbeit geeignete Schutzhandschuhe und Schutzbrille/Gesichtsschutz tragen.
S26:Bei Berührung mit den Augen sofort gründlich mit Wasser abspülen und Arzt konsultieren.
S24:Berührung mit der Haut vermeiden.
Beschreibung
Benzocaine (ethyl p-aminobenzoate) is used topically by itself or in combination with menthol or
phenol in nonprescription dosage forms such as gels, creams, ointments, lotions, aerosols, and
lozenges to relieve pain or irritation caused by such conditions as sunburn, insect bites,
toothache, teething, cold sores or canker sores in or around the mouth, and fever blisters.
Benzocaine is a lipophilic local anesthetic agent with a short duration of action.
Like most amino ester-type local anesthetics, it is easily hydrolyzed by plasma cholinesterase.
Because of its low pKa, however, it is un-ionized under most physiological conditions and, therefore, can only bind
to the lipid side of the local anesthetic receptor. It also can easily cross membranes
into systemic circulation to cause systemic toxicities. Furthermore, being a PABA derivative, it
has similar allergenic properties to procaine and is contraindicated with sulfonamide antibacterial
agents.
Chemische Eigenschaften
Benzocaine is a white odourless needle-like crystal, slightly soluble in water and easily soluble in organic solvents. For example: ethanol, chloroform, ether, soluble in almond oil, olive oil.
Verwenden
Benzocaine is used as an anesthetic (Local and topical) that in products such as burn and sunburn remedies, hemorrhoidal creams, suppositories, creams for treatment of poison ivy, oral and gingival products, sore-throat sprays/lozenges, astringents, appetite suppressants, callus and wart remedies, athlete's-foot remedies, toothache- and denture-irritation products.
Definition
ChEBI: Benzocaine is a benzoate ester having 4-aminobenzoic acid as the acid component and ethanol as the alcohol component. A surface anaesthetic, it is used to suppress the gag reflex, and as a lubricant and topical anaesthetic on the larynx, mouth, nasal cavity, respiratory tract, oesophagus, rectum, urinary tract, and vagina. It has a role as a topical anaesthetic, an antipruritic drug, an allergen and a sensitiser. It is a benzoate ester and a substituted aniline.
Biologische Funktion
Benzocaine is a PABA derivative used primarily for
topical application to skin and mucous membranes. Its
low aqueous solubility allows it to stay at the site of application
for long periods. Its minimal rate of absorption
after topical administration is associated with a low incidence
of systemic toxicity. Benzocaine is contraindicated
in patients with known sensitivity to ester-linked
anesthetics or PABA-containing compounds.
Allgemeine Beschreibung
Benzocaine is a unique local anesthetic because it does notcontain a tertiary amine. The pKa of the aromatic amine is 3.5ensuring that benzocaine is uncharged at physiological pH.Because it is uncharged, it is not water soluble but is ideal fortopical applications. The onset of action is within 30 secondsand the duration of drug action is 10 to 15 minutes.
Clinical Use
Benzocaine is used for endoscopy, bronchoscopy, and topicalanesthesia. Benzocaine is available as a 20% solution topicalspray, in a 1% gel for mucous membrane application, and a14% glycerin suspension for topical use in the outer ear.Toxicity to benzocaine can occur when the topical doseexceeds 200 to 300 mg resulting in methemoglobinemia.Infants and children are more susceptible to this and methemoglobinemiahas been reported after benzocaine lubricationof endotracheal tubes and after topical administration to treata painful diaper rash.
Sicherheitsprofil
Poison by ingestion and
intraperitoneal routes. Human systemic
effects by rectal route:
methemoglobinemia/carboxyhemoglobinem
ia in infants. A skin irritant and a mild
sensitizer. Local contact may cause contact
dermatitis. Used as a topical anesthetic and
as a sun-screening agent. When heated to
decomposition it emits highly toxic fumes of
NOx. See also ETHYL ALCOHOL and
ESTERS
läuterung methode
Crystallise Benzocaine from EtOH/H2O or EtOH (m 93-94o), and dry it in air. [Beilstein 14 H 422, 14 IV 1129.]
Benzocain Upstream-Materialien And Downstream Produkte
Upstream-Materialien
Downstream Produkte
