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This eBook is a collection of articles from a Frontiers Research Topic. Frontiers Research Topics are very popular trademarks of the Frontiers Journals Series: they are collections of at least ten articles, all centered on a particular subject. With their unique mix of varied contributions from Original Research to Review Articles, Frontiers Research Topics unify the most influential researchers, the latest key findings and historical advances in a hot research area! Find out more on how to host your own Frontiers Research Topic or contribute to one as an author by contacting the Frontiers Editorial Office: frontiersin.org/about/contact

psychosis --- antipsychotic --- clozapine --- schizophrenia --- treatment refractory

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Antiviral agents are used for the treatment of viral diseases. Antiviral drugs have been successfully developed and used clinically for a limited number of important human viral diseases notably caused by human immunodeficiency virus (HIV), hepatitis C virus (HCV), hepatitis B virus (HBV), herpes, and influenza viruses. Despite the successes of these antiviral drugs, issues with drug resistance and toxicity remain challenging. These challenges are driving research to identify new drug candidates and to investigate novel drug targets to develop new mechanistic drug classes. Antiviral agents are not available against many viruses that cause human disease and economic burdens; in particular, the development of antiviral agents against emerging, re-emerging, and neglected viruses is increasingly becoming a priority. This book includes six review articles that discuss new antiviral strategies. The reviews either discuss advances relating to a specific virus or new therapeutic targets and approaches. The book includes 15 original research articles reporting new antiviral agents against a variety of clinically and economically important viruses and studies into the prevalence or acquisition of drug resistance. Overall, this book is an exciting collection of new research and ideas relating to the development of antiviral agents.

Zika virus --- nucleoside analogues --- antiviral agents --- NS5 --- prodrugs --- ProTides --- neural stem cells --- RNA-dependent RNA polymerase --- cytomegalovirus --- latent infection --- TALEN --- Surveyor nuclease mutation detection assay --- ie-1 gene --- quantitative real-time PCR --- Epstein–Barr virus --- herpes viruses --- lytic gene expression --- Burkitt lymphoma cells --- clozapine --- antipsychotic drug --- antiviral drug --- enteroviruses --- coxsackievirus B4 --- persistent infection --- fluoxetine --- resistance --- mutations --- herpes B virus --- macacine herpesvirus-1 --- genistein --- flavonoids --- acyclovir --- ganciclovir --- Plantago asiatica --- Clerodendrum trichotomum --- RSV --- therapeutic effects --- acteoside --- human antimicrobial peptides --- antiviral strategies --- defensins --- cathelicidins --- hepcidins --- transferrins --- influenza A virus --- brevilin A --- antiviral --- sesquiterpene lactone --- replication --- PRRSV --- polyethylenimine --- PEI --- virion internalization --- endocytosis --- HIV --- pediatrics --- Ethiopia --- pre-treatment drug resistance --- combination antiretroviral therapy (cART) --- dried plasma spots --- dried blood spots --- sphingolipids --- glycosphingolipids --- viruses --- lipid biosynthesis --- flavivirus --- Japanese encephalitis virus --- furin inhibitor --- precursor membrane protein --- measles virus --- central nervous system --- tropism --- treatments --- porcine reproductive and respiratory syndrome virus --- ginsenoside Rg1 --- antiviral activity --- pro-inflammatory factor --- NF-κB signaling pathway --- acute/latent infection --- congenital infection --- antiviral agent --- therapeutic strategies --- nucleic acid-based therapeutic approach --- HCMV vaccine --- adoptive cell therapy --- Rev response element --- chemical footprinting --- SHAPE --- drug discovery --- branched peptides --- herpesvirus --- immediate-early --- IE1 --- IE2 --- ribozyme --- RNA interference --- CRISPR/Cas --- small molecule --- orthohantavirus --- phenyl-benzotriazoles --- C-FRA --- Porcine circovirus type 2 --- epigallocatechin gallate --- heparan sulfate --- antiviral effect --- virus attachment --- microvirin --- lectin --- human immunodeficiency virus --- hepatitis C virus --- antiviral inhibitor --- non-immunogenic --- viral entry --- protein drugs --- LUMS1 --- oleanane-type derivatives --- influenza A virus (IAV) --- virus entry inhibitors --- hemagglutinin (HA) --- n/a --- Epstein-Barr virus

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Polypharmacy is a necessary and important aspect of drug treatment; however, it becomes a challenge when the medication risks outweigh the benefits for an individual patient. Drug–drug interactions and the introduction of prescribing cascades are common features of polypharmacy, which can lead to ineffectiveness and increased risk of adverse drug reactions (ADR). Genes encoding CYP450 isozymes and other drug-related biomarkers have attracted considerable attention as targets for pharmacogenetic (PGx) testing due to their impact on drug metabolism and response. This Special Issue is devoted to explore the status and initiatives taken to circumvent ineffectiveness and to improve medication safety for polypharmacy patients. Specific areas include drug–drug interactions and consequences thereof in therapeutic management, including PK- and PD-profiling; the application of PGx-based guidance and/or decision tools for drug–gene and drug–drug gene interactions; medication reviews; development and application of deprescribing tools; and drivers and barriers to overcome for successful implementation in the healthcare system.

acute kidney injury --- early biomarker --- plasma neutrophil gelatinase-associated lipocalin --- soluble urokinase plasminogen activator receptor --- medication optimization --- older patients --- emergency department --- multimorbidity --- polypharmacy --- potentially inappropriate medication use --- older adults --- prevalence --- determinants --- chronic --- outpatient --- 2019 Beers criteria --- Ethiopia --- pharmacogenomics --- persons with diabetes --- drug–drug interactions --- drug–gene interactions --- cytochrome P450 --- SLCO1B1 --- drug interaction checkers --- adverse drug reactions --- pharmacogenetics --- personalized medicine --- phenprocoumon --- DOACs --- bleeding --- thromboembolism --- HLA --- drug hypersensitivity --- abacavir --- allopurinol --- flucloxacillin --- antiepileptic drugs --- cost-effectiveness --- shared medication record --- medication reconciliation --- drug information service --- hospital pharmacy service --- electronic prescribing --- electronic medical record --- clinical pharmacist --- CYP2D6 --- CYP2D7P --- CYP2D8P --- copy number variation --- CNV --- genotyping --- 5’nuclease assay --- HRM --- high resolution melting --- drug metabolization --- extracellular vesicles --- exosomes --- microvesicles --- pharmacogene expression --- medication review --- deprescriptions --- quality of life --- aged --- aged, 80 and over --- nursing homes --- deprescribing --- medication-based risk score --- health outcomes --- cytochromes --- CYP1A2 --- adverse drug reaction --- antipsychotics --- olanzapine --- clozapine --- loxapine --- children --- youth --- digital decision-support --- health services research --- general practice --- process evaluation --- antidepressants --- utility --- population-based --- appropriateness --- medication adherence --- digital health