title: [Nucleoside and nucleotide analogs in the treatment of chronic hepatitis B].
abstract: At least 4 nucleos(t)ide analogs have been approved for the treatment of chronic hepatitis B: lamivudine, adefovir dipivoxil, entecavir, and telbivudine. The introduction of these drugs has radically changed the treatment of this disease. The advantages of these drugs are their oral administration, excellent tolerability and efficacy in all types of chronic hepatitis B (compensated and decompensated disease). The limitations are the need for prolonged treatments, which hampers adherence and can cause selection of HBV strains resistant to distinct drugs. The resistance rate differs for each of the drugs. Nucleotide analogs such as adefovir and tenofovir are useful in patients resistant to nucleoside analogs such as lamivudine, entecavir and telbivudine and vice versa. In cases of resistance to one of these drugs, combined treatment is advised.
authors.affiliation: Servicio de Hepatología y Medicina Interna, Hospital General Universitario Vall d'Hebron, CIBER del Instituto de Salud Carlos II, Barcelona, España. mbuti@vhebron.net
authors.forename: María
authors.initials: M
authors.lastname: Buti
mesh_terms: D000225:Adenine / Q000008:administration & dosage / Q000031:analogs & derivatives / Q000627:therapeutic use; D000998:Antiviral Agents / Q000008:administration & dosage / Q000627:therapeutic use*; D002986:Clinical Trials as Topic / Q000706:statistics & numerical data; D003841:Deoxycytidine / Q000008:administration & dosage / Q000031:analogs & derivatives / Q000627:therapeutic use; D024882:Drug Resistance, Viral; D004359:Drug Therapy, Combination; D000068679:Emtricitabine; D005838:Genotype; D006147:Guanine / Q000008:administration & dosage / Q000031:analogs & derivatives / Q000627:therapeutic use; D006513:Hepatitis B e Antigens / Q000032:analysis; D006515:Hepatitis B virus / Q000187:drug effects / Q000235:genetics / Q000502:physiology; D019694:Hepatitis B, Chronic / Q000188:drug therapy*; D006801:Humans; D019259:Lamivudine / Q000008:administration & dosage / Q000627:therapeutic use; D015337:Multicenter Studies as Topic / Q000706:statistics & numerical data; D009705:Nucleosides / Q000008:administration & dosage / Q000627:therapeutic use; D063065:Organophosphonates / Q000008:administration & dosage / Q000627:therapeutic use; D011744:Pyrimidinones / Q000008:administration & dosage / Q000627:therapeutic use; D016032:Randomized Controlled Trials as Topic / Q000706:statistics & numerical data; D018894:Reverse Transcriptase Inhibitors / Q000008:administration & dosage / Q000627:therapeutic use*; D000077712:Telbivudine; D000068698:Tenofovir; D013936:Thymidine / Q000031:analogs & derivatives; D016896:Treatment Outcome; D014779:Virus Replication / Q000187:drug effects
chemical_list: D000998:Antiviral Agents; D006513:Hepatitis B e Antigens; D009705:Nucleosides; D063065:Organophosphonates; D011744:Pyrimidinones; D018894:Reverse Transcriptase Inhibitors; D003841:Deoxycytidine; D000077712:Telbivudine; D019259:Lamivudine; C413685:entecavir; D006147:Guanine; D000068698:Tenofovir; D000068679:Emtricitabine; D000225:Adenine; C106812:adefovir dipivoxil; D013936:Thymidine