31 results about "Drugs retention" patented technology

A method for encapsulation of antineoplastic agents in liposomes is provided, having preferably a high drug:lipid ratio. Liposomes may be made by a process that loads the drug by an active mechanism using a transmembrane ion gradient, preferably a transmembrane pH gradient. Using this technique, trapping efficiencies approach 100%, and liposomes may be loaded with drug immediately prior to use, eliminating stability problems related to drug retention in the liposomes. Drug:lipid ratios employed are about 3-80 fold higher than for traditional liposome preparations, and the release rate of the drug from the liposomes is reduced. An assay method to determine free antineoplastic agents in a liposome preparation is also disclosed.

Liposomal compositions which have enhanced retention properties for biological agents are characterized by an intrasomal osmolarity of 500 mOSM/kg or less and by containing substantially no cholesterol. The liposomes comprise vesicle forming lipids along with aggregation preventing components, and typically have transition temperatures of 38° C. or higher.

The teachings are directed to a medical device having a drug-retaining coating that at least substantially delays the initial elution of a drug for a time effective at forming a functional endothelium over a surface of the medical device.

The invention describes a liposome composition for enhanced retention of a quinolone compound, and in particular of a fluoroquinolone compound. Entrapped in the liposomes is a polyanionic polymer effective to form a complex with the fluoroquinolone. A method of preparing the liposomes which includes a process for removal of unentrapped polyanionic polymer is also described.

The present invention relates to targeted drug delivery of a drug or therapeutic agent through medical devices coated with formulations comprising of therapeutic agent. The coating on medical devices comprises of therapeutic agent(s), affinity vehicle(s) and additives for targeted drug delivery of biologically active material(s). The invention provides a method of manufacturing the formulation, method of coating the medical devices with such formulations to achieve controlled delivery of optimum drug dose at the target site within the body, desirable drug retention on the medical devices in vivo and in vitro and desirable drug release at the target tissue in-vivo. The invention this provides a mechanism to enhance the bioavailability of the therapeutic agent at the target tissue in the treatment of restenosis thereby reduces the actual dose of the therapeutic agent and provides a very thin layer of coating on the surface of the medical device.

Compositions which comprise an anthracycline agent, and a cytidine analog are encapsulated in liposomal carriers. The preferred anthracycline agent is selected from the group of daunorubicin, doxorubicin, and idarubicin, while the preferred cytidine analog is selected from the group of cytarabine, gemcitabine, or 5-azacytidine. The combination of the anthracycline agent and cytidine analog encapsulated in said liposomal carriers are useful in achieving a drug retention and a sustained drug release for each therapeutic agent.

The present invention is directed to immunosupportive, drug sparing diets and methods of using these diets. The compositions and methods disclosed herein increase the bioavailability of pharmaceutical compositions metabolized by the gut P450 isozymes.

The present invention provides liposome compositions containing sparingly soluble drugs that are used to treat life-threatening diseases. A preferred method of encapsulating a drug inside a liposome is by remote or active loading. However, this process as described in the literature has been limited to drugs that are freely soluble in aqueous solution or solubilized as a water-soluble complex. This invention describes compositions and methods for remote loading drugs with low water solubility (<2 mg/mL). In the preferred embodiment the drug in the solubilizing agent is mixed with the liposomes in aqueous suspension so that the concentration of solubilizing agent is lowered to below its capacity to completely solubilize the drug. This results in the drug precipitating but remote loading is capability retained. The process is scalable and the resulting drug-loaded liposomes are characterized by a high drug-to-lipid ratios and predictable drug retention when the liposome encapsulated drug is administered in patients.

The invention provides a negative-pressure transdermal drug delivery device and aims to solve the problems that a conventional transdermal drug delivery device injures skin in the use process and is low in transdermal drug delivery curative effect. The technical key points are that a composite drug-loaded dressing containing a drug is loaded into the negative-pressure transdermal drug delivery device, a meshy elastic member fixed at the edge of the inner wall is arranged in the position, in contact with the skin, of the negative-pressure transdermal drug delivery device, and a semi-circular member allowing air to pass is arranged in the internal middle of the negative-pressure transdermal drug delivery device. After negative pressure is pumped into the negative-pressure transdermal drug delivery device, the surface area of the skin per unit area is increased, the skin tissue space is enlarged, and further, the drug transdermal impedance is reduced. Along with increase of the negative pressure, the meshy elastic member and the semi-circular member in the negative-pressure transdermal drug delivery device limits swelling of the skin and tissues, a reversed pushing action force is formed on the skin in negative pressure due to action of resistance, so that the drug can be easily loaded into the skin and enters a human body through the space-enlarged skin and tissues, and after relief of the negative pressure, the human body skin tissues recover while the drug remains in the human body.

The present invention relates to the use of copper ions to achieve enhanced retention of a therapeutic agent within a liposome. The invention may be employed to more effectively deliver a liposomally encapsulated therapeutic agent to a target site in vitro and in vivo for anti-cancer or other therapy. The liposome may comprise an interior buffer solution containing the therapeutic agent, the solution having a pH less than 6.5 and most preferably approximating pH 3.5. At least some of the copper ions are retained within the interior solution. In a particular embodiment the therapeutic agent may be a chemotherapeutic drug, such as irinotecan. The invention may also comprise an ionophore to facilitate loading of drug into the liposome. In one particular embodiment the combination of the ionophore A23187 and encapsulated divalent copper (Cu2+) resulted in an irinotecan formulation that exhibited surprisingly improved drug retention attributes.

The present invention relates to a pharmaceutical gastro-retentive solid oral dosage form comprising nilotinib as the active ingredient. The invention is further related to methods of preparing said dosage form.

A composition containing the extract of toad venom for anodyne and anesthesia is disclosed, which features that it contains also high-molecular materials, so having slow release function.

The methods using associated formulations for intra-articular local delivery to treat an afflicted joint, for example, to treat osteoarthritis. Some methods deliver anti-inflammatory agents and angiogenesis inhibitors, and can include sensitizing agents for one or both. Formulations can include hyaluronic acid, a therapeutic solvent, and drug micro or nanoparticles, which may be formed of drug alone or in combination with an excipient or polymeric carrier. The carrier can include hydrophobic sugar nano-particles, which can resist degradation and provide extended cushioning. The excipient or polymer can be used to manipulate release rates and to increase drug retention to the affected region.