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Targeted delivery is believed to improve efficacy while reducing side-effects. When implementing a targeted release system, the following design criteria for the system must be taken into account: the drug properties, side-effects of the drugs, the route taken for the delivery of the drug, the targeted site, and the disease.
Controlled drug release systems can be achieved through several methods. Rate-programmed drug delivery systems are tuned to the diffusivity of active agents across the membrane. [44] Another delivery-release mechanism is activation-modulated drug delivery, where the release is triggered by environmental stimuli.
Several nano-delivery drugs were on the market by 2019. [17] Drug delivery systems, lipid-[18] or polymer-based nanoparticles, can be designed to improve the pharmacokinetics and biodistribution of the drug. [19] [20] [21] However, the pharmacokinetics and pharmacodynamics of nanomedicine is highly variable among different patients. [22]
Artificial cells in biological cell encapsulation were first used in the clinic in 1994 for treatment in a diabetic patient [33] and since then other types of cells such as hepatocytes, adult stem cells and genetically engineered cells have been encapsulated and are under study for use in tissue regeneration. [34] [35]
Drug delivery systems have been around for many years, but there are a few recent applications of drug delivery that warrant 1. Drug delivery to the brain: Many drugs can be harmful when administered systemically; the brain is very sensitive to medications and can easily cause damage if a drug is administered directly into the bloodstream.
This allows for much more precise drug delivery over an extended period of time, which results in much more predictable pharmacokinetics. However, osmotic release systems are relatively complicated, somewhat difficult to manufacture, and may cause irritation or even blockage of the GI tract due to prolonged release of irritating drugs from the ...
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