Pilocarpin Chemische Eigenschaften,Einsatz,Produktion Methoden
R-S?tze Betriebsanweisung:
R26/28:Sehr giftig beim Einatmen und Verschlucken.
S-S?tze Betriebsanweisung:
S25:Berührung mit den Augen vermeiden.
S45:Bei Unfall oder Unwohlsein sofort Arzt zuziehen (wenn m?glich, dieses Etikett vorzeigen).
Beschreibung
Pilocarpine acts by stimulating muscarinic receptors, therefore making it similar in action
to acetylcholine when systematically introduced. This compound differs from acetylcholine in that it does not react with any nicotinic receptors, but by stimulating the CNS.
Its effects are blocked by atropine. It has found therapeutic use in ophthalmology as a
myotic agent.
Chemische Eigenschaften
Colorless crystalline solid or an oil; melts at34°C (93.2°F); dissolves in water, alcohol,and chloroform; slightly soluble in ether andbenzene.
Physikalische Eigenschaften
Appearance: colorless crystal or white crystalline powder. Solubility: freely soluble
in water; slightly soluble in ethanol; insoluble in chloroform or diethyl ether.
Melting point: 174–178?°C.
History
It has a history of hundreds of years since pilocarpine was used to treat glaucoma
.
In 1933, the chemical synthesis of pilocarpine was firstly reported. However,
pilocarpine couldn’t be used for treatments, because its synthetic route is so long
and focuses on isopilocarpine, of which the pharmacological activities are 1/20–
1/50 of pilocarpine. In 1972, DeGraw successfully synthesized the cis-homopilopic
acid employing catalytic hydrogenation of precious metals and obtained pilocarpine
as the main part product. Therefore, the study on the production of pilocarpine by
chemical synthesis has made new progress and has been artificially synthesized .
Verwenden
Pilocarpine occurs in the leaves of variousspecies of pilocarpus. It is used as an antidotefor atropine poisoning and in ophthalmologyto produce contraction of the pupil.
Definition
ChEBI: The (+)-enantiomer of pilocarpine.
Health Hazard
Pilocarpine is a tropane alkaloid. Toxicsymptoms are characterized by muscariniceffects. Toxic effects include hypersecretionof saliva, sweat, and tears; contraction of thepupils of the eyes; and gastric pain accom panied with nausea, vomiting, and diarrhea.Other symptoms are excitability, twitching,and lowering of blood pressure. High dosesmay lead to death due to respiratory failure.A lethal dose in humans is estimated withinthe range of 150–200 mg.
Pharmakologie
Pilocarpine activates cholinergic M-receptor and has an obvious effect on eyes and
salivary glands. Pilocarpine nitrate eye drops take part in the actions of myosis,
depressing intraocular pressure and alleviating cyclospasm. It increases glandular
secretions at 10–20? mg, i.h., including the sweat gland, salivary gland, lacrimal
gland, gastric gland, pancreas, intestinal gland, respiratory mucosa, and so on.
Pilocarpine activates intestinal smooth muscle and promotes its tension and peristalsis. It induces asthma by activating bronchial smooth muscle and activates
smooth muscles of uterus, bladder, gallbladder, and biliary passage as well
Clinical Use
Pilocarpine nitrate is mainly used to treat glaucoma clinically. Characterized with
the progressive cupping of the optic disk, hypopsia, and elevated intraocular pressure, the severe patients will go blind. Patients with angle-closure glaucoma (congestive glaucoma) generally have the narrow anterior chamber angle, the obstruction
of aqueous humor outflow, and the elevation of intraocular pressure, and these can
be reversed by a low-concentration pilocarpine. But it is noted that a highconcentration pilocarpine will promote the progress of glaucoma. Pilocarpine is
also used to treat open-angle glaucoma. The mechanism of the action is not entirely
clear. Using atropine and pilocarpine alternately prevents posterior synechiae. In
addition, pilocarpine is orally used to treat Zagari’s disease after neck radiotherapy,
increasing salivary secretion and sweat secretion
Sicherheitsprofil
A human poison by
subcutaneous route. Poison experimentally
by ingestion, intravenous, intraperitoneal,
and subcutaneous routes. A very poisonous
alkaloid that is used to remove excess fluid
accumulations from the body. Its action on
the sweat glands makes it a powerful
sudorific. It very rarely causes death, but,
when it does, it is by paralysis of the heart or
edema of the lungs. Dangerous; on heating
to decomposition it emits toxic fumes of
NOx.
Einzelnachweise
Hardy., Bull. Soc. Chim. Fr., 24,497 (1875)
Gerrard., Pharm. J., 5,865,965 (1875)
Gerrard., ibid, 7,255 (1877)
Hardy, Calmels., Compt. rend., 102,1116,1251,1562 (1886)
Wagenaar., Pharm. Weekbl., 67, 285 (1930)
Preobrashenski et al., Ber., 63,460 (1930)
Preobrashenskietal., ibid, 69, 1835 (1936)
Roche, Lynch., Analyst, 73,311 (1948)
Pharmacology:
Hollander., Gastroenterology, 2, 20 I (1944)
Pilocarpin Upstream-Materialien And Downstream Produkte
Upstream-Materialien
Downstream Produkte
