113 results about "Mesalazine" patented technology

Disclosed are mesalazine tablets and a method for their preparation. The mesalazine tablets comprise a tablet core, a first coating layer, and a second coating layer. The tablet core comprises mesalazine; the first coating layer comprises a cellulose derivative and/or povidone, and the second coating layer comprises methacrylic acid/methyl methacrylate copolymer and an anti-tack agent. The tablets show a high degree of uniformity and reproducibility and release mesalazine starting at pH 6.8 and are used in the treatment of colorectal diseases.

Modified or extended release formulations containing mesalamine compounds and associated methods are disclosed and described. In some aspects, such formulations may be substantially bioequivalent to known FDA approved mesalamine formulations such as PENTASA®.

The present invention is directed to a high drug formulation having desirable properties in terms of ease of manufacture and visual appearance as well as a sachet for the formulation.

Modified or extended release formulations containing mesalamine compounds and associated methods are disclosed and described. In some aspects, such formulations may be substantially bioequivalent to known FDA approved mesalamine formulations such as PENTASA®.

The invention relates to a mesalazine enteric sustained-release tablet preparation method, and belongs to the technical field of medicine. According to the present invention, a mesalazine enteric sustained-release tablet core is prepared by using wet granulation and tableting, and the mesalazine enteric sustained-release tablet is prepared through enteric coating, wherein each tablet contains 1.2g of mesalazine.

The invention discloses an oral mesalazine colon-specific adhesive preparation with a high drug-loading rate, which can be used for effectively treating ulcerative colitis and segmental ileitis, as well as a preparation method of the oral mesalazine colon-specific adhesive preparation. The preparation is composed of a pill-containing core and an enteric coating layer, wherein the pill-containing core consists of mesalazine, excipient, adhesive and boning agent. Compared with the other oral preparations, the oral mesalazine colon-specific adhesive pellet has the effects of improving the curative effect and lowering adverse reactions when the dosage is the same. Compared with enema and suppository, the pellet has better tolerance. The preparation method can be used for effectively controlling the temperature in the production process and avoiding an overheating phenomenon in the preparation process, and is simple in preparation process and high in drug-loading rate. Besides, the oral mesalazine colon-specific adhesive pellet is applicable to the large-dose dosing characteristic of mesalazine, thereby reducing the medicine taking inconvenience of a patient and improving the dependence of the patient.

The invention discloses a temperature-sensitive gel enema capable of prolonging the detention time of mesalazine in colons and a preparation method of the temperature-sensitive gel enema. The mesalazine temperature-sensitive gel enema is prepared from mesalazine as a main drug, temperature-sensitive gel substrate poloxamer, a bio-adhesive material, a stabilizer and an appropriate amount of water. The mesalazine temperature-sensitive gel enema for colons disclosed by the invention is a liquid freely flowing at a room temperature, is injected to the colons in a liquid form, and has the advantages of uniform drug distribution and good spreadability. Then, the mesalazine temperature-sensitive gel enema is subjected to phase transformation fast under a body temperature condition to form non-chemically-crosslinked semisolid gel, thereby prolonging the detention time of the drug in the colons in addition to the mucous membrane adhesion effect of the bio-adhesive material. Compared with a conventional mesalazine enema, the mesalazine temperature-sensitive gel enema disclosed by the invention can be used for effectively reducing drug liquid leakage and improving the curative effect, and has the advantages of simple preparation and low irritation.

The invention provides a mesalazine enteric-coated sustained-release pellet, which consists of a slow-release pellet core and an enteric-coated dressing. The slow-release pellet core contains 40-45 wt.% of mesalazine, 45-50 wt.% of a matrix sustained-release composite, 5-10% of a chaotropic agent and 0-5 wt.% of other additives; the matrix sustained-release composite consists of glyceryl behenate and microcrystalline cellulose in the weight ratio of 2-4:1. The invention also provides a preparation method of the mesalazine enteric-coated sustained-release pellet. The method provided by the invention employs a skeleton controlled-release technology to control drug release, reaches ideal drug release rate and good inter-batch reproducibility in preparation, does not have high requirement on equipment, and is in favor of ndustrial production.

The present invention relates to a mesalamine rectal suppository designed to provide improved comfort of use. One embodiment of the invention is a mesalamine rectal suppository comprising mesalamine and one or more pharmaceutically acceptable excipients, wherein the drug load of the suppository ranges from 35% to 50%. Another embodiment of the invention is a mesalamine rectal suppository comprising from about 850 to about 1150 mg mesalamine and one or more pharmaceutically acceptable excipients, wherein the total weight of the suppository ranges from about 2250 to about 2700 mg. Another embodiment of the invention is a mesalamine rectal suppository comprising from about 400 to about 600 mg mesalamine and one or more pharmaceutically acceptable excipients, wherein the total weight of the suppository ranges from about 870 to about 1715 mg. Yet another embodiment of the invention is a mesalamine rectal suppository comprising mesalamine having a tap density ranging from about 600 to about 800 g/L (as measured by USP <616>) and a hard fat having an ascending melting point of 32 to 35.5° C. Methods of preparing and methods of treatment with mesalamine suppositories are also provided. The invention further provides a method of determining a dissolution parameter (such as dissolution rate) of a mesalamine rectal suppository, such as a 1 g mesalamine suppository, by measuring its dissolution with USP Apparatus #2 at 40° C. and a paddle rotation speed of 125 rpm in 0.2 M phosphate buffer at a pH of 7.5.

The invention discloses a mesalazine enteric coatel tablet and a preparation method of the mesalazine enteric coatel tablet. The mesalazine enteric coatel tablet is characterized in that a nanotechnology, an enteric coating technology and a pellet tabletting technology are adopted to reduce the amount of release in the mesalazine enteric coatel tablet, increase the amount of release in a buffer solution, improve the curative effect, prolong the expiration date, guarantee the product quality, and obtain the promising result.

The invention discloses a mesalazine enteric-coated sustained release tablet. The mesalazine enteric-coated sustained release tablet is characterized by consisting of the following components in a unit dose: 1.2g of mesalazine, 0.1-0.3g of a sustained release material, 0.004.0.03g of a lubricant and 0.02-0.1g of enteric-coated powder. The release of the mesalazine enteric-coated sustained release tablet in one hour in simulated intestinal fluid of which the pH value is 7.2 is less than 30%, the release in four hours is not more than 70%, and the release in eight hours exceeds 80%.

The invention discloses a production of a mesalazine colon-specific drug administration sustained-release tablet. The mesalazine (5-ASA) is widely applied clinically, and becomes a priority drug for treating inflammatory bowel diseases. The mesalazine is ineffective when being orally taken, because the mesalazine is quickly absorbed in the small intestine, then acetylated and discharged along with urine, thus being not able to reach the colon part. 5-ASA can only play the treatment function when reaches the colon lesion part in a prototype, and is produced into a pH-dependent colon-specific drug administration sustained-release tablet, so that the 5-ASA drug which reaches the colon has enough concentration to have an anti-inflammatory effect. Eudragit L100 and Eudragit S100 can be used to produce a film coating which meets the colon-specific release requirement according to a certain proportion. The mesalazine is produced into a coating sustained-release tablet, so that the 5-ASA drug which reaches the colon has enough concentration to achieve the anti-inflammatory effect.

The invention discloses an industrialized preparation method of mesalazine. The preparation method is characterized by comprising the following steps: 1) taking 2-chlorine-5-nitrobenzoic acid (I) as astarting raw material, adding alkali, and performing substitution reaction at certain temperature to generate 2-hydroxy-5-nitrobenzoic acid (intermediate II); and 2) reducing nitryl by using raney nickel under certain pressure, at certain temperature and under the catalyst and alkaline conditions to prepare the finished product mesalazine. The process synthesis cost is low, the reaction conditionis mild, the whole process takes water as a solvent, a poisonous reagent is not used, the catalyst is recycled, and the whole process adopts green production; and the product prepared by the processhas high yield and high purity.

The present invention provides methods of treating inflammatory bowel disease comprising administering to a subject in which remission has not been achieved after a first treatment of about 4-8 weeks of 5-ASA (mesalamine or 5-ASA), a further daily dose greater than about 4 g of 5-ASA in controlled release form to achieve a favorable response to treatment.

The invention relates to a method for detecting specific impurities of mesalazine, belonging to the technical field of medicines. According to the invention, a phenyl bonded silica gel is used as a monomer for a chromatographic column, a mobile phase is prepared by mixing an organic phase with a buffer salt solution containing an ion-pairing agent according to a certain ratio, and elution is carried out. The method of the invention can simultaneously detect a plurality of specific impurities of mesalazine, has good specificity, high detection sensitivity and good precision, and is applicable to detection of specific impurities of mesalazine bulk drugs and to specificity of detection of specific impurities of delayed-release mesalazine tablets.

The invention discloses mesalazine enteric positioned controlled-release preparation, comprising a core, a controlled-release coating layer, an adhesive coating layer, and an enteric coating layer. The core includes mesalazine, hydroxyl propyl cellulose and talc powder, the controlled-release coating layer is composed of ethyl cellulose and triethyl citrate, the adhesive coating layer is made from sodium alginate, the enteric coating layer is composed of methacrylic acid and methyl methacrylate copolymer, triethyl citrate and talc powder. The invention also provides a preparation method of the enteric positioned controlled-release preparation. The preparation method is simple with controllable parameters, prepared pellets do not release in gastric acid and may release slowly for 24 hours in a dissolution medium at pH 7.5. This preparation is irritating to gastrointestinal adhesion and may be used in acute stage treatment for ulcerative colitis (inflammation accompanied ulcers) and maintenance treatment for preventing recurrence.

The invention provides a method for preparing a mesalazine enteric coated tablet comprising: (i) granulating a composition comprising mesalazine, a pharmaceutically acceptable salt, or ester thereof, into mesalazine granulates; (ii) tabletting a core composition comprising the mesalazine granulates obtained in (i) to obtain a tablet core; (iii) coating the tablet core obtained in (ii) with at least an intermediate layer and an enteric coating; where the tablet core hardness is controlled to be comprised between 80 N and 105 N and the intermediate layer represents less than 2% by weight of the tablet.

The invention provides mesalazine dripping pills and a preparation method thereof. According to the invention, mesalazine and a substrate are combined according to a weight ratio of 1:1-100, such that the dripping pills are obtained. According to the invention, a mesalazine preparation form is changed from tablets unto dripping pills, such that the medicine is dispersed into the substrate in a state of molecules, colloid or microcrystalline. Medicine total surface area is increased. The substrate is hydrophilic, such that a wetting effect is provided for the medicine, and the medicine can be rapidly dispersed into micro-particles or solution. Therefore, medicine dissolving and absorption are accelerated, and bioavailability and medicine stability are improved. The dripping pills are highly efficient and convenient. Therefore, the mesalazine dripping pills provided by the invention has the advantages of accelerated dissolving and absorption, convenient application, high bioavailability and medicine stability, reduced adverse reaction, fast effect, convenient carrying, simple production process, and suitability for large-scale productions.

The invention provides an oral pharmaceutical tablet for controlled release of mesalazine or a pharmaceutically acceptable salt thereof as active ingredient with a core and a gastro-resistant outer coating, wherein the core comprises mesalazine and a hydrophilic matrix consisting of a mixture of hydroxypropylmethyl cellulose (HPMC) having a different viscosity and the gastro-resistant outer coating comprises a pH-dependent release polymer, with the pharmaceutically acceptable excipients. The invention also refers to the process for obtaining said oral pharmaceutical tablet and to said oral pharmaceutical tablet of controlled release of mesalazine for treating ulcerative colitis.

The present invention relates to a mesalamine rectal suppository designed to provide improved comfort of use. One embodiment of the invention is a mesalamine rectal suppository comprising mesalamine and one or more pharmaceutically acceptable excipients, wherein the drug load of the suppository ranges from 35% to 50%. Yet another embodiment of the invention is a mesalamine rectal suppository comprising mesalamine having a tap density ranging from about 600 to about 800 g/L (as measured by USP <616>) and a hard fat having an ascending melting point of 32 to 35.5° C. Yet another embodiment is a mesalamine rectal suppository comprising mesalamine particles and one or more pharmaceutically acceptable excipients, where the mesalamine particles have a surface area of from about 0.1 m²/g to about 2.8 m²/g (e.g., from about 0.1 m²/g to about 1.3 m²/g). Methods of preparing and methods of treatment with mesalamine suppositories are also provided. The invention further provides a method of determining a dissolution parameter (such as dissolution rate) of a mesalamine rectal suppository, such as a 1 g mesalamine suppository, by measuring its dissolution with USP Apparatus #2 at 40° C. and a paddle rotation speed of 125 rpm in 0.2 M phosphate buffer at a pH of 7.5.

The invention relates to a Mesalazine oral sustained-release pharmaceutical composition which is characterized by comprising the following ingredients by weight per one unit of preparation: 0.9g-1.3gof Mesalazine, 0.01g-0.05g of carnauba wax, 0.01g-0.05g of stearic acid, 0.05g-0.2g of hydrogenated castor oil, 0.05g-0.2g of sodium carboxymethylcellulose, 0.05g-0.2g of sodium carboxymethyl starch,0.005g-0.02g of silicon dioxide, 0.005g-0.02g of magnesium stearate, 0.005g-0.02g of talcum powder and 0.02g-0.1g of enteric coating powder. The invention also provides a preparation method of the Mesalazine oral sustained-release pharmaceutical composition. All the ingredients have a synergistic effect, so that the finally prepared composition is good in sustained-release effect and stable in property.

A mesalamine rectal suppository having improved comfort of use and better retention in lower rectum for a long period of time is provided. The suppository contains a suppository base, at least one surfactant and at least one mucoadhesive agent. A method for manufacturing the suppository and methods for treating ulcerative colitis, such as active ulcerative proctitis, using such suppository is also provided.

The invention provides a method for determination of related substances in mesalazine enemas. In the method, high performance liquid chromatography is adopted, octadecyl silane bonded silica gel is used as column filler, a ultraviolet detector is adopted, appropriate organic phase, buffer solution and water are selected as mobile phase, and gradient elution is adopted to effectively solve the problem of separation between mesalazine and impurities. The method has high specificity, good repeatability and can ensure controllability of the process and degradation of the impurities in mesalazine.