474 results about "Amlodipine" patented technology

Methods are disclosed utilizing the optically pure (-) isomer of amlodipine. This compound is a potent drug for the treatment of hypertension while avoiding the concomitant liability of adverse effects associated with the racemic mixture of amlodipine. The (-) isomer of amlodipine is also useful for the treatment of angina and such other conditions as may be related to the activity of (-) amlodipine as a calcium channel antagonist such as cerebral ischemia, cerebral disorders, arrhythmias, cardiac hypertrophy, coronary vasospasm, myocardial infarction, renal impairment and acute renal failure, without the concomitant liability of adverse effects associated with the racemic mixture of amlodipine.

A method for the separation of R-(+)- and S-(-)-isomers of amlodipine (I) from mixtures thereof, which comprises the reaction of the mixture of isomers with either L- or D-tartaric acid in an organic solvent containing sufficient dimethyl sulphoxide (DMSO) for the precipitation of, respectively, a DMSO, solvate of an L-tartate salt of R-(+)-amlodipine, or a DMSO solvate of a D-tartrate salt of S-(-)-amlodipine.

A pharmaceutical composition comprising enantiomerically pure (S)-amlodipine, an ARB and optional other active agents, and methods of treating, preventing and managing cardiovascular diseases and disorders, and symptoms thereof, using the composition, are disclosed.

The invention discloses a pharmaceutical composition for treating hypertension and other cardiovascular diseases, wherein the active constituents include pharmaceutical salts of levamlodipine besylate and angiotensin II receptor antagonists. The invention can not only overcome the drawback of photodecomposition of the levoamlodipine maleate medicaments, but also can increase the dissolving degree by 21%.

The invention discloses benzene sulfonic acid levo-amlodipine pills and a preparation method thereof. On the basis of 1000 pills, the benzene sulfonic acid levo-amlodipine pill comprises 1-10g of benzene sulfonic acid levo-amlodipine, preferably 2.5g; 50-100g of lactose, preferably 67-87g and most preferably 80g; 5-55g of low-substituted hydroxy propyl cellulose, preferably 20-40g and particularly preferred 30g; 2-20g of crosslinked polyethylene ketopyrrolidine, preferably 5g; and 0.5-2.5g of magnesium stearate, preferably 1.5g. The benzene sulfonic acid levo-amlodipine pills have more than 95 percent of dissolution rate and good production stability.

The invention belongs to the technical field of medicament, and provides levamlodipine beaylate tablets and a preparation method thereof. The tablets consist of tablet cores using the levamlodipine beaylate as an active component and film coatings coated on the outer layer, wherein diluent in the tablet cores contains diatomite or aerosil, or a mixture of diatomite and aerosil, and contains other pharmaceutically acceptable supplementary materials; and the outer film coating accounts for 8 to 12 percent of the weight of the tablets, and can play a role in resisting humidity and avoiding light to ensure that the medicinal stability can be greatly improved, and related substances are obviously reduced. Furthermore, the tablets have small specification, so the tablets ensure uniform content, and improve dissolution; and the method is simple and controllable, and ensures that the hygroscopicity of the medicament is obviously reduced.

The invention relates to a levamlodipine besylate tablet, a preparation process thereof and a control method for relevant materials. Each 1000 levamlodipine besylate tablets provided by the invention comprise the following compositions: 2.5g of levamlodipine besylate (measured in besylate), 30 to 50g of lactose (as a filler), 20 to 40g of beta-cyclodextrin (as an inclusion agent), 25 to 45g of microcrystalline cellulose (as a disintegrating agent), 5 to 15g of cross-linked polyvinylpyrrolidone (as a disintegrating agent), 1 to 2g of magnesium stearate (as lubricant), and 50 to 80g of 2.5% HPMC (hydroxypropyl methylcellulose) and 50% ethanol (as an adhesive). The levamlodipine besylate tablet provided by the invention has the advantages of making multi-item improvements on the properties of the levamlodipine besylate, increasing the solubility and apparent dissolution rate of the tablet, improving the stability of the tablet, reducing the excitability of the tablet, significantly reducing the limit of the relevant material, and having better clinical treatment effect, so that the blood pressure lowering of the patient with hypertension is more stable.

The invention discloses levamlodipine beaylate tablets which is prepared by comprising the following raw materials in parts by weight: 1-20 parts of levamlodipine beaylate, 20-150 parts of filling agent, 10-100 parts of disintegrating agent and 1-10 parts of lubricant. The preparation method of the levamlodipine beaylate tablets comprises the following steps of: evenly mixing the raw materials, crushing, screening with a 60-100 mesh sieve, evenly mixing, and preparing the levamlodipine beaylate tablets in a novel powder feeder for a tablet machine by using a direct dry powder tablet compressing method. Compared with the traditional tablet production technology, the levamlodipine beaylate tablets of the invention have the advantages of favorable compressibility, friability and tablet weight variation, uniform content and stable quality.

The invention provides a stable and rapidly disintegrable aqueous oral preparation (liquid or jelly preparation) of amlodipine. The liquid preparation comprises an anionic surfactant having a sulfuric acid group or a sulfonic acid group as a stabilizer in an aqueous solution of amlodipine, at pH 5-7, while the jelly preparation further comprises a gelling agent, a fine powder solid, and a gelling regulator.

The invention relates to an atenolol and amlodipine bilayer tablet. Particularly, the invention relates to a bilayer tablet comprising a first tablet layer and a second tablet layer, wherein the first tablet layer contains atenolol as an active constituent and a pharmaceutically acceptable excipient or accessory, and the second tablet layer contains amlodipine as an active constituent or a pharmaceutically acceptable salt thereof and a pharmaceutically acceptable excipient or accessory. The invention also provides a preparation method of the bilayer tablet. The bilayer tablet provided by the invention not only has favorable stability, but also has favorable dissolution rate.

The invention takes N, N-dimethylformamide as a chiral auxiliary and separates amlodipine with tartaric acid resolution reagent to prepare l-amlodipine. In addition, benzene sulfonic acid and l-amlodipine alkali are directly salified and refined, filtered and dried via a special filter to produce levoamlodipine besylate. The upper part and the lower part of the special filter adopted by the invention are respectively provided with a hemispherical top cap and a hemispherical bottom cap, the middle part is provided with a lauter tank and ring groove filter plates are respectively arranged between the top cap and the lauter tank or the bottom cap and the lauter tank. A feed pipe, inlet and outlet of inert gases, an outlet of cooling fluid and a temperature meter are installed on the top cap of the filter; a discharge pipe and the outlet of cooling fluid are installed on the bottom cap. The filter is provided with an insulating layer and an interlayer, thus can control the temperature, avoid light, be filled with inert gases and protect the feed liquid and filtrate from oxidation, illumination and high temperature damage. The filtration efficiency is high, the effect is good and the structure is simple, the filter operation, disassembly, assembly and cleaning are convenient and the levoamlodipine besylate enjoys high synthesis and production yield and stable quality.

The present invention relates to chemical method of resolving despinner Amlodipine into (S)-(-)-Amlodipine and (R)-(+)-Amlodipine. The resolving agent is L-tartaric acid or D-tartaric acid; and the solvent is methyl ethyl sulfoxide or mixed solvent containing methyl ethyl sulfoxide. The present invention has greatly shortened reaction period and no special requirement on the water content in the solvent, and is especially suitable for large scale production.

The invention provides a levamlodipine besylate crystal with the molecular formula being (C20H25ClN2O5) (C6H6O3S) (H2O) 1.5 and the molecular weight being 594.07. Crystallography measurement parameters are a monoclinic system and P21 chirality space groups, and the chirality absolute configuration is determined by crystallography Flack parameter being 0.08(6); the unit cell size is shown in the specification, wherein beta is 95.817(4) degrees, and V is 2880.1(11). The characteristic peak in an X-ray powder diffraction pattern (Cu-Kalpha) is displayed at 2thea being 6.70 degrees, 10.12 degrees, 12.40 degrees, 13.36 degrees, 13.68 degrees, 17.04 degrees, 22.46 degrees and 24.16 degrees. The invention further provides a preparation method and application of the levamlodipine besylate crystal. The levamlodipine besylate crystal has the specific crystal form and the amount of crystal water and specific crystallography main parameters and the exact atom spatial position, the solubleness and stability of existing levamlodipine besylate are improved, the stability and bioavailability of the levamlodipine besylate tablet can be improved, preparation is easy, the cost is low, and the obtained crystal is regular in form, uniform in particle size and suitable for large-scale application and popularization.

The combination of amlodipine and atorvastatin act to synergistically synthesize NO production. Moreover, the addition of a tertiary compound complements this combination of amlodipine and atorvastatin in NO production.

The present invention discloses preparation process of Amlodipine benzene sulfonate. The preparation process includes the following steps: 1. the reaction between 4-[2-(tritylamindo)ethoxy] ethyl acetoacetate and amine compound to produce 3-amino-4-[2-( tritylamindo)ethoxy] ethylcrotonate; 2. the reaction between o-chluoro benzaldehyde and methyl acetoacetate under the catalysis of alkali to produce 2-(2-o-chluorobenzal)-ethyl acetoacetate; 3. the reaction of the products in the foregoing steps to obtain 4-(2-chlorophenyl)-6-methyl-2-((2-(tritylamido) ethoxy) methyl)-1, 4-dihydropyridyl-3-ethyl formate-5-methyl formate; and 4. further direct reaction with benzene sulfonic acid to eliminate protecting group and form Amlodipine benzene sulfonate.