**8. Conclusions**

Necessary human equivalent doses still need to be tuned to generate drug carriers with adequate chemical, mechanical, and biological properties that are loaded with the specific doses of the pharmaceutical drug for a certain therapy. Another opportunity for the study is the proposed different taste masking in order to avoid the bad taste of some drugs or polymers. In all these studies, still, biocompatibility, biodegradability, mechanical testing, *in vivo* efficacy, and pharmacokinetics, must be studied. Future work must be focused on the biological response of the tissue and clinical phases must be performed [33].

For all discussed, the use of drug carriers is a promising technology that can be applied in most administration routes such as oral, vaginal, transdermal, ocular, rectal, and nasal tissues. The unique qualities of these drug delivery systems include a large surface area, nanoporosity, high drug encapsulation, and fast disintegration

*Novel Drug Carries: Properties and Applications DOI: http://dx.doi.org/10.5772/intechopen.106868*

and dissolution properties. The advantages and limitations of various synthetic polymers and natural polymers nanofibers are discussed in the context of producing target drug delivery systems. Also, the bioavailability can be enhanced by exploiting the hydrophilic nature of polymers and their ability to form hydrogen bonds with encapsulated drugs, resulting in uniform distribution of encapsulated molecules throughout the matrices and providing the formulation with rapid dissolution abilities. Despite much literature being found, most of them still test these systems just for *in vitro* approaches. But *in vivo* and clinical trials are still poor.
