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Various Drug Delivery Systems (DDSs) are often used in modern medicine to achieve controlled and targeted drug release. Diffusional release of drugs from DDSs is often the main mechanism, especially at early times. Generally, average dimensions of DDS are used to model the drug release, but our recent work on drug release from fibers demonstrated that taking into account diameter distribution is essential. This work systematically investigated the effect of size distribution on diffusional drug release from DDSs of various geometric forms such as membranes, fibers and spherical particles. The investigation clearly demonstrated that the size distribution has the largest effect on the drug release profiles from spherical particles compared to other geometric forms. Published experimental data for drug release from polymer micro- and nanoparticles were fitted and the diffusion coefficients were determined assuming reported radius distributions. Assuming the average radius when fitting the data leads to up to 5 times underestimation of the diffusion coefficient of drug in the polymer.
This article was published in the following journal.
Name: Journal of pharmaceutical sciences
It was reported that wax matrix (WM) particles composed of low-melting-point microcrystalline wax showed unique release behaviors; the particles released only a small amount of the entrapped drug (non...
Microgels, such as polymeric hydrogels, are currently used as drug delivery devices (DDSs) for chemotherapeutics and/or unstable drugs. The clinical DDS DC bead® was studied with respect to loading a...
Controlled release of hydrophilic drugs from carriers is still faced with problems due to the poor compatibility of such substances with slowly degradable polymers leading to challenges regarding fabr...
Nanoparticles (NPs) are promising carriers for dermal and transdermal drug delivery. However, the underlying dynamics of drug release from the NPs, especially, how the physiological changes of disease...
The purpose of this study was to apply the phenomenon of liquid jet breakup to the preparation of sustained-release microspheres. The mechanisms of liquid jet breakup in different jet states were inve...
1. To estimate the absorption of a single oral dose of a controlled release varenicline tablet under fed and fasted conditions. 2. To evaluate the pharmacokinetics, safety, and tol...
The purpose of this study is to 1) evaluate the extent of absorption of multiple doses of three pregabalin controlled release tablets as compared to multiple doses of the pregabalin immedi...
Our research aims to reveal whether the low b-values distribution and the number of NEX for each b value will influence the accuracy of pseudodiffusion parameter derived from IVIM in brain...
The objectives of this study were: - to compare the pharmacokinetic profiles of two prototype controlled-release (CR) trazodone hydrochloride (HCl) 300 mg tablets versus two refer...
This study is to test the idea that a controlled release formulation of CE-224,535 may allow for less frequent dosing and exposure to lower levels of drug than an immediate release formula...
Forms to which substances are incorporated to improve the delivery and the effectiveness of drugs. Drug carriers are used in drug-delivery systems such as the controlled-release technology to prolong in vivo drug actions, decrease drug metabolism, and reduce drug toxicity. Carriers are also used in designs to increase the effectiveness of drug delivery to the target sites of pharmacological actions. Liposomes, albumin microspheres, soluble synthetic polymers, DNA complexes, protein-drug conjugates, and carrier erythrocytes among others have been employed as biodegradable drug carriers.
The illegal acquisition, sale, production, transport, movement, and distribution of controlled substances such as narcotics.
Accumulation of a drug or chemical substance in various organs (including those not relevant to its pharmacologic or therapeutic action). This distribution depends on the blood flow or perfusion rate of the organ, the ability of the drug to penetrate organ membranes, tissue specificity, protein binding. The distribution is usually expressed as tissue to plasma ratios.
Dosage forms of a drug that act over a period of time by controlled-release processes or technology.
A diagnostic technique that incorporates the measurement of molecular diffusion (such as water or metabolites) for tissue assessment by MRI. The degree of molecular movement can be measured by changes of apparent diffusion coefficient (ADC) with time, as reflected by tissue microstructure. Diffusion MRI has been used to study BRAIN ISCHEMIA and tumor response to treatment.
Pharmacy is the science and technique of preparing as well as dispensing drugs and medicines. It is a health profession that links health sciences with chemical sciences and aims to ensure the safe and effective use of pharmaceutical drugs. The scope of...
<!--LGfEGNT2Lhm-->Drug delivery is the method or process of administering a pharmaceutical compound to achieve a therapeutic effect in humans or animals. <!--LGfEGNT2Lhm-->Drug delivery technologies are <!--LGfEGNT2Lhm-->patent pr...
Clinical Approvals Clinical Trials Drug Approvals Drug Delivery Drug Discovery Generics Drugs Prescription Drugs In the fields of medicine, biotechnology and pharmacology, drug discovery is the process by which drugs are dis...