Conventional delivery

In conventional delivery, the pharmacological response to a drug is assumed to be linearly related to the drug concentration in the plasma. This relationship between concentration and effect is much more... 

Precursor transport Although related to the volatility described earlier, transport is mentioned separately here because of potential impact on this area. Liquid delivery methods have demonstrated advantages over conventional delivery methods for thermally unstable and low-volatility precursors, as illustrated by some of the examples described in this review. The development of improved transport techniques might alleviate the necessity for better volatilities and thermal stabilities required by traditional delivery methods of these precursors. However, whether liquid delivery methods will be adopted into Si-based manufacturing processes remains to be seen. It seems more likely that these transport methods will be used in applications where less stringent control over purity is acceptable. 

Controlled-release systems can fulfill most of all these required measures and can master the troubles of conventional delivery systems. One such approach of controlled delivery, which is most leisurely and convenient, is the microparticulate drug delivery system. 

Recent research has explored various chitosan based microencapsulated nanoparticles for circumventing various problems of conventional delivery systems. One beautiful example of chitosan-alginate PEC microcapsules by membrane emulsification method is mentioned in Fig. 3.10. 

Conventional delivery systems (CDS) are characterized by rapid and uncontrolled drug release kinetics. Here, drug absorption is controlled by the physiological mechanisms which assimilate the therapeutic molecule [53,54]. 

A growing challenge for both doctors and patients is the administration of multiple medications simultaneously. Instead of keeping track of a dozen pills daily, a printer can now fabricate a single, custom-made pill for each patient. That pill contains the exact amount, combination, and arrangement of medication that a patient needs that day. The pill could have a special identification marking, eliminating much of the confusion and uncertainty associated with conventional delivery methods. 

---