31 results about "Piperaquine" patented technology

The invention discloses a method for preparing piperaquine phosphate. 4,7-dichloroquinoline is taken as an initial raw material and is subjected to condensation reaction with anhydrous piperazidine first to obtain 7-chloro-4-(1-piperazinyl)quinoline, then the 7-chloro-4-(1-piperazinyl)quinoline is subjected to condensation reaction with 1, 3-bromochloropropane to obtain piperaquine, and finally the piperaquine is salified with phosphorous acid to obtain the piperaquine phosphate. The method has a simple process, is easy to purify intermediate products and a final product, has high product yield and good quality, avoids the use of toxic reagents, has small pollution to the environment and low production cost, and is suitable for industrialized production.

The invention discloses a novel polycrystal substance of piperaquine phosphate. Compared with amorphous piperaquine phosphate, the polycrystal substance of the piperaquine phosphate, which is disclosed by the invention, has better stability and better facilitates the production, the storage and the circulation of raw medicine and preparations thereof, wherein a crystal form A of the piperaquine phosphate has the best stability, the best dissolution rate and the best dissolubility. The invention further discloses a preparation method of the polycrystal substance of the piperaquine phosphate. The method has the advantages of low toxicity, people friendliness, environment friendliness, easily-controlled technological parameters, and the like, is simple to operate and is suitable for mass production.

The present invention provides a novel combination comprising artemisinin in the form of tablets and related dosage forms for pediatric use, such as granules, suppository, suspension syrup and dry powder, for the treatment of human malarias including multiple-resistant subtertian malaria, tertian malaria and quartan malaria. Said combination is comprised of artemisinin, piperaquine and primaquine. Clinical tests in Southeast Asia countries where malaria is epidemic demonstrate that, apart from having high and rapid therapeutic effect possessed by the most excellent domestic and foreign artemisinin-type anti-malarial drugs, the present combination is also featured with shorter course of treatment, less side effect, lower material cost, and more convenience for administration, and its ability of rapidly killing gametophyte and cutting off infection source thereby blocking spreading of malaria is a further improvement.

The invention discloses a piperaquine dihydroartemisinin tablet and the related preparation method, aiming at providing a piperaquine dihydroartemisinin tablet which is convenient to take and is prepared with dihydroartemisinin and piperaquine phosphate. The invention is made of 40 portions of dihydroartemisinin, 320 portions of piperaquine phosphate, 70 to 90 portions of starch, 20 to 30 portions of dextrin, 30 to 35 portions of sodium carboxymethyl starch, 6 to 10 portions of lhydroxypropyl cellulose and 3 to 5 portions of magnesium stearate (based on weight). The invention has the advantages of high finished product rate and low cost.

The invention discloses a method for synthesizing a piperaquine intermediate by means of a microchannel reactor, and belongs to the technical field of synthesis of antimalarial medicines. The method comprises the steps of dissolving piperaquine in an appropriate amount of water as a material I, dissolving 4,7-dichloroquinoline in an organic solvent as a material, and transporting the material I toa preheating module of the microchannel reactor for preheating; and transporting the preheated material I to a reaction module set of the microchannel reactor, meanwhile, directly transporting the material into the reaction module set of the microchannel reactor, making the material I and the material subjected to condensation reaction, collecting reaction liquid which flows out of an outlet of the microchannel reactor, and obtaining 7-chloro-4-piperazinoquinoline after conducting post-treatment on the reaction liquid. By means of the synthesis method, reaction time can be effectively shortened, so that acid non-soluble substance impurities are greatly reduced.

The invention belongs to the field of medical preparations and in particular provides a dihydroartemisinin piperaquine dry suspension agent. The dihydroartemisinin piperaquine dry suspension agent is prepared from dihydroartemisinin, piperaquine phosphate, sodium carbonate and pharmaceutically acceptable auxiliary materials, wherein the weight ratio of the dihydroartemisinin to the piperaquine phosphate to the sodium carbonate is (10 to 30) : (140 to 180) : (10 to 46). The technology can be used for remarkably improving the bitter taste of the piperaquine phosphate and improving the compliance of clinical medication for patients, and is more suitable for medication for children patients.

The invention relates to the field of piperaquine phosphate impurity control, and specifically relates to a control method of piperaquine phosphate impurity. The control method of piperaquine phosphate impurity comprises the following steps: 1), adding a non-polar solvent into a piperaquine phosphate crude product, stirring and filtering; 2), adding a polar solvent, conducting reflux, stirring and filtering; 3), adding a water / polar mixed solvent, stirring and dissolving at 90-110 DEG, adding activated carbon for decoloring and filtering to obtain a filtrate, cooling, crystallizing, filtering, washing and drying. The steps 1) 2) and 3) are not in a particular order. The control method of piperaquine phosphate impurity provided by the invention has the advantages of simple process, and extensive equipment and reagent sources, thus indirectly reducing cost for drug impurity removal, and can be widely applied to preparation of piperaquine phosphate.

The present invention provides a microcapsule pharmaceutical composition of at least a bisquinoline drug. said microcapsule comprises a drug core of a pharmaceutically effective amount of a bisquinoline drug and a polymeric coating over the core. This microcapsule pharmaceutical composition has desirable pharmaceutical properties, including taste masking effect and a high stability.

The present invention provides a new process of synthesis of a polymorph of 7-chloro-4-(piperazin-1-yl)-quinoline of Formula I. Said quinoline compound is substantially pure of any impurities. The present invention further provides the use of the above-mentioned polymorph of 7-chloro-4-(piperazin-1-yl)-quinoline in the synthesis of piperaquine or one of its pharmaceutically acceptable salts.

The invention provides piperaquine phosphate oral liquid and a preparation method thereof. The piperaquine phosphate oral liquid is prepared from the following components in parts by weight: 1 part ofpiperaquine phosphate, 5-15 parts of water, 1-2 parts of ethanol and a pH regulator; the pH value of the oral liquid is 2.5-4. The preparation method comprises the following steps: mixing piperaquinephosphate, water and ethanol, and regulating the pH value to 2.5-4 by use of the pH regulator to obtain a piperaquine phosphate solution; adding the rest raw materials into the solution to obtain theproduct. The oral liquid provided by the invention has the advantages of relatively fast absorption, stable quality and the like, and is suitable for the old people, children and patients suffering dysphagia, and is easy to take; moreover, with strong efficacy, the oral liquid is a good substitute of piperaquine phosphate tablets.

The field of the invention relates to stable oral dosage forms comprising, (a) cis-adamantane-2-spiro-3'-8'-[[[(2'-amino-2'-methylpropyl)amino]carbonyl]-methyl]-l',2',4'-trioxaspiro[4.5]decane hydrogen maleate(Active compound I); (b) piperaquine; and (c) one or more pharmaceutically acceptable excipients; and processes for their preparation, especially wherein the dosage form is prepared by a dry process.

Provided herein are compositions and methods of ameliorating pharmaceutical aversiveness via salt. In one aspect, a composition is provided comprising Praziquantel, and an effective amount of Na Gluconate which suppresses bitter taste of orally administrated Praziquantel. Additionally, a composition is provided comprising Piperaquine and an effective amount of KOH which suppresses aversiveness of orally administrated Piperaquine.

The invention discloses a high-yield piperaquine preparation method and belongs to the technical field of anti-malarial medicine preparation. The preparation method comprises the following steps: firstly, utilizing piperaquine hydrochloride as a starting material, adding hot water, stirring to completely dissolve the starting material while heating the starting material and filtering to obtain a piperaquine hydrochloride solution; then, adding ammonium hydroxide into the obtained piperaquine hydrochloride solution to perform neutral reaction and filtering to obtain piperaquine precipitate; finally, adding purified water into the obtained piperaquine precipitate and repeatedly washing, dewatering and drying to obtain piperaquine. According to the preparation method disclosed by the invention, the piperaquine hydrochloride is utilized as the starting material to directly perform neutral reaction with ammonium hydroxide to obtain piperaquine through one-step transformation. As the piperaquine is insoluble in water, the piperaquine is easy to separate and purify and has the advantages of small impurities, high purity and high product yield. In addition, the technical scheme of the preparation method disclosed by the invention further avoids use of toxic reagents and has the advantages of small work procedures, low production cost and suitability for industrial production.