PMID- 31172838 OWN - NLM STAT- MEDLINE DCOM- 20200302 LR - 20200302 IS - 1744-7593 (Electronic) IS - 1742-5247 (Linking) VI - 16 IP - 7 DP - 2019 Jul TI - Lipid-based carriers for the delivery of local anesthetics. PG - 701-714 LID - 10.1080/17425247.2019.1629415 [doi] AB - INTRODUCTION: There is a clinical need for pharmaceutical dosage forms devised to prolong the acting time of local anesthetic (LA) agents or to reduce their toxicity. Encapsulation of LA in drug delivery systems (DDSs) can provide long-term anesthesia for inpatients (e.g. in immediate postsurgical pain control, avoiding the side effects from systemic analgesia) and diminished systemic toxicity for outpatients (in ambulatory/dentistry procedures). The lipid-based formulations described here, such as liposomes, microemulsions, and lipid nanoparticles, have provided several nanotechnological advances and therapeutic alternatives despite some inherent limitations associated with the fabrication processes, costs, and preclinical evaluation models. AREAS COVERED: A description of the currently promising lipid-based carriers, including liposomes, microemulsions, and nanostructured lipid carriers, followed by a systematic review of the existing lipid-based formulations proposed for LA. Trends in the research of these LA-in-DDS are then exposed, from the point of view of administration route and alternatives for non-traditionally administered LA molecules. EXPERT OPINION: Considering the current state and potential future developments in the field, we discuss the reasons for why dozens of formulations published every year fail to reach clinical trials; only one lipid-based formulation for the delivery of local anesthetic (Exparel(R)) has been approved so far. FAU - de Araujo, Daniele Ribeiro AU - de Araujo DR AUID- ORCID: 0000-0002-9289-4229 AD - a Human and Natural Sciences Centre , Federal University of ABC , Sao Paulo , Brazil. FAU - Ribeiro, Ligia Nunes de Morais AU - Ribeiro LNM AUID- ORCID: 0000-0001-6097-5449 AD - b Department of Biochemistry and Tissue Biology , Institute of Biology, University of Campinas - UNICAMP , Campinas, Sao Paulo , Brazil. FAU - de Paula, Eneida AU - de Paula E AUID- ORCID: 0000-0003-4504-5723 AD - b Department of Biochemistry and Tissue Biology , Institute of Biology, University of Campinas - UNICAMP , Campinas, Sao Paulo , Brazil. LA - eng PT - Journal Article PT - Research Support, Non-U.S. Gov't PT - Review DEP - 20190620 PL - England TA - Expert Opin Drug Deliv JT - Expert opinion on drug delivery JID - 101228421 RN - 0 (Anesthetics, Local) RN - 0 (Drug Carriers) RN - 0 (Lipids) RN - 0 (Liposomes) SB - IM MH - Anesthesia, Local/methods MH - Anesthetics, Local/*administration & dosage MH - Animals MH - Drug Carriers/chemistry MH - *Drug Delivery Systems MH - Humans MH - Lipids/*chemistry MH - Liposomes MH - Nanoparticles/administration & dosage MH - Nanostructures OTO - NOTNLM OT - Local anesthetics OT - drug-delivery systems OT - liposomes OT - microemulsions OT - nanostructured lipid carriers OT - routes of administration OT - solid lipid nanoparticles EDAT- 2019/06/08 06:00 MHDA- 2020/03/03 06:00 CRDT- 2019/06/08 06:00 PHST- 2019/06/08 06:00 [pubmed] PHST- 2020/03/03 06:00 [medline] PHST- 2019/06/08 06:00 [entrez] AID - 10.1080/17425247.2019.1629415 [doi] PST - ppublish SO - Expert Opin Drug Deliv. 2019 Jul;16(7):701-714. doi: 10.1080/17425247.2019.1629415. Epub 2019 Jun 20.