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Risk Categories for Drugs that Prolong QT & induce Torsades de Pointes (TdP) - from CredibleMeds

Based on an ongoing and systematic analysis of all available evidence by CredibleMeds' Scientific Review Board, CredibleMeds® places drugs into broad categories based on whether each can cause QT prolongation or TdP.  Because these actions are highly dependent on the circumstances of each drug’s use AND each patient’s clinical characteristics, this is not an attempt to rank-order the drugs within each category.  Therefore, it is not recommend that these lists be used to rank-order the drugs for their relative toxicity.


Generic Name
Brand Names (Partial List)
Drug Class
Therapeutic Use
PubMed Search
Risk Category
Albuterol (salbutamol)Proventil, Ventolin, Ventolin-HFA, Accuneb, Combivent, Vospire-ER, ProAir HFA, DuonebBronchodilatorAsthma
AlfuzosinUroxatralAlpha1-blockerBenign prostatic hyperplasia 
AmantadineSymmetrel, SymadineAntiviralViral infection (Influenza), Parkinson's disease 
AmiodaroneCordarone, Pacerone, NexteroneAntiarrhythmicAbnormal heart rhythm 
Amisulpride (Only on Non US Market)Solian, Supitac, Soltus, Amitrex, AmazeoAntipsychotic, atypicalSchizophrenia 
AmitriptylineElavil (Discontinued 6/13), Tryptomer, Tryptizol, Laroxyl, Saroten, Sarotex Lentizol, EndepAntidepressant, TricyclicDepression 
Amphetamine (Amfetamine)Adderal-XR, Dexedrine, DextroampCNS stimulantADHD
Amphotericin BFungilin, Fungizone, Abelcet, AmBisome, Fungisome, Amphocil, AmphotecAntifungalFungal infection 
AnagrelideAgrylin, XagridPhosphodiesterase 3 inhibitorThrombocythemia 
ApomorphineApokyn, Ixense, Spontane, UprimaDopamine agonistParkinson's disease 
ArformoterolBrovanaBronchodilatorBronchoconstriction in COPD
AripiprazoleAbilify, AripiprexAntipsychotic, atypicalSchizophrenia, depression (adjunct) 
Arsenic trioxideTrisenoxAnticancerCancer (leukemia) 
Artenimol+piperaquine (Only on Non US Market)EurartesimAntimalarialMalaria 
AsenapineSaphris, SycrestAntipsychotic, atypicalSchizophrenia 
Astemizole (Removed from Market)HismanalAntihistamineAllergic rhinitis 
AtazanavirReyataz, EvotazAntiviralViral infection (HIV/AIDS) 
AtomoxetineStratteraNorepinephrine reuptake inhibitorADHD 
AzithromycinZithromax, ZmaxAntibioticBacterial infection 
BedaquilineSirturoAntibioticTuberculosis, Multi-drug resistant 
BendamustineTreanda, Treakisym, Ribomustin, LevactAlkylating agentLeukemia, lymphoma 
Bendroflumethiazide or bendrofluazide (Only on Non US Market)AprinoxDiuretic, thiazideHypertension, diuresis 
Benperidol (Only on Non US Market)Anquil, GlianimonAnti-psychoticAntipsychotic 
Bepridil (Removed from Market)VascorAntianginalAngina Pectoris (heart pain) 
BetrixabanBevyxxaAnticoagulantAnticoagulant 
BortezomibVelcade, BortecadProteasome inhibitorCancer (multiple myeloma,lymphoma) 
BosutinibBosulifTyrosine kinase inhibitorCancer (leukemia) 
BuprenorphineButrans, Belbuca, Bunavail, Buprenex, Suboxone, ZubsolvOpioid receptor modulatorNarcotic addiction and pain 
CabozantinibCometriqAnti-cancerRenal cell carcinoma 
CapecitabineXelodaAnticancerCancer (GI, Breast) 
CeritinibZykadiaKinase inhibitorCancer (Lung) 
Chloral hydrateAquachloral, Novo-Chlorhydrate, Somnos, Noctec, SomnoteSedativeSedation, insomnia 
ChloroquineAralenAntimalarialMalaria 
ChlorpromazineThorazine, Largactil, MegaphenAntipsychotic / AntiemeticSchizophrenia, nausea, many others 
CilostazolPletalPhosphodiesterase 3 inhibitorIntermittent claudication 
CiprofloxacinCipro, Cipro-XR, NeofloxinAntibioticBacterial infection 
Cisapride (Removed from Market)PropulsidGI stimulantIncrease GI motility 
CitalopramCelexa, CipramilAntidepressant, SSRIDepression 
ClarithromycinBiaxin, PrevpacAntibioticBacterial infection 
Clofazimine (Only on Non US Market)LampreneAntimycobacterialLeprosy 
ClomipramineAnafranilAntidepressant, TricyclicDepression 
ClozapineClozaril, Fazaclo, VersaclozAntipsychotic, atypicalSchizophrenia 
CocaineCocaineLocal anestheticAnesthesia (topical) 
CrizotinibXalkoriKinase inhibitorCancer (Non-small cell lung cancer, metastatic) 
Cyamemazine (cyamepromazine) (Only on Non US Market)TercianAntipsychoticSchizophrenia, sedation 
DabrafenibTafinlarKinase inhibitorCancer (melanoma) 
DasatinibSprycelTyrosine kinase inhibitorCancer (leukemia) 
DegarelixFirmagon, FerringGonadotropin Releasing Hormone Agonist/antagonistCancer (prostate) 
Delamanid (Only on Non US Market)DeltybaAntibioticTuberculosis, drug resistant 
DesipraminePertofrane, NorpramineAntidepressant, TricyclicDepression 
DeutetrabenazineAustedoVesicular monamine transporter 2 inhibitorChorea (Huntington's disease 
DexmedetomidinePrecedex, Dexdor, DexdomitorSedativeSedation 
DexmethylphenidateFocalin, Focalin-XR, AttenadeCNS stimulantADHD
Dextroamphetamine (Dexamfetamine)Dexedrine, dexamphetamine, dexamfetamine, (S)-(+)-amphetamine, Dextrostat, Dexedrine, Metamina, Attentin, Zenzedi, Procentra, AmfexaCNS stimulantADHD, obesity
DiphenhydramineBenadryl, Nytol, Unisom, Sominex, Dimedrol, DaedalonAntihistamineAllergic rhinitis, insomnia 
DisopyramideNorpaceAntiarrhythmicAbnormal heart rhythm 
DobutamineDobutrexInotropeHeart failure, shock (low blood pressure)
DofetilideTikosynAntiarrhythmicAbnormal heart rhythm 
DolasetronAnzemetAntiemeticNausea, vomiting 
Domperidone (Only on Non US Market)Motilium, Motillium, Motinorm Costi, NomitAntinauseaNausea, vomiting 
DonepezilAriceptCholinesterase inhibitorDementia (Alzheimer's Disease) 
DopamineIntropineInotropeHeart failure, shock (low blood pressure)
DoxepinSinequan, Silenor, Aponal, Adapine, Doxal, Deptran, SinquanAntidepressant, TricyclicDepression 
DronedaroneMultaqAntiarrhythmicAbnormal heart rhythm 
DroperidolInapsine, Droleptan, Dridol, XomolixAntipsychotic / AntiemeticAnesthesia (adjunct), nausea 
DroxidopaNortheraAdrenergic pro-drugNeurogenic orthostatic hypotension
EfavirenzSustiva and othersAntiretroviralHIV 
EliglustatCerdelgaGlucosylceramide synthase inhibitorGaucher's disease 
EphedrineRynatuss, BroncholateBronchodilator, decongestantAllergic reaction, allergic rhinitis, asthma
Epinephrine (adrenaline)Primatene, BronkaidCatecholamine, vasoconstrictorAllergic reaction, anaphylaxis, cardiac arrest
EpirubicinEllence, Pharmorubicin, Epirubicin EbeweAnti-cancerCancer 
Eribulin mesylateHalavenMicrotubule inhibitorCancer (breast, metastatic) 
ErythromycinE.E.S., Robimycin, EMycin, Erymax, Ery-Tab, Eryc Ranbaxy, Erypar, Eryped, Erythrocin Stearate Filmtab, Erythrocot, E-Base, Erythroped, Ilosone, MY-E, Pediamycin, Abboticin, Abboticin-ES, Erycin, PCE Dispertab, Stiemycine, Acnasol, TilorythAntibioticBacterial infection, increase GI motility 
EscitalopramCipralex, Lexapro, Nexito, Anxiset-E (India), Exodus (Brazil), Esto (Israel), Seroplex, Elicea, Lexamil, Lexam, Entact (Greece), Losita (Bangladesh), Reposil (Chile), Animaxen (Colombia), Esitalo (Australia), Lexamil (South Africa)Antidepressant, SSRIDepression (major), anxiety disorders 
EsomeprazoleNexium, Nexum and othersProton Pump InhibitorGastric hyperacidity, GERD 
Ezogabine (Retigabine)Potiga, TrobaltAnticonvulsantSeizures, Partial 
FamotidinePepcid, Fluxid, QuamatelH2-receptor antagonistGastric hyperacidity, GERD 
FelbamateFelbatolAnticonvulsantEpilepsy 
Fenfluramine (Removed from Market)Pondimin, Ponderax, AdafaxAppetite suppressantObesity
FingolimodGilenyaSphingosine phospate receptor modulatorMultiple Sclerosis 
FlecainideTambocor, Almarytm, Apocard, Ecrinal, FlécaineAntiarrhythmicAbnormal heart rhythm 
FluconazoleDiflucan, TricanAntifungalFungal infection 
Fluorouracil (5-FU)Adrucil, Carac, Efudex, Efudix, othersAnti-cancerCancer 
FluoxetineProzac, Sarafem, FontexAntidepressant, SSRIDepression 
Flupentixol (Only on Non US Market)Depixol, FluanxolDopamine 2 and 5HT2a antagonistSchizophrenia 
FluvoxamineFaverin, Fevarin, Floxyfral, Dumyrox and LuvoxSelective Serotonin Reuptake InhibitorDepression, Obsessive Compulsive Disorder 
FormoterolForadil, Foradile, Oxeze, Oxis, Atock, Atimos, Atimos Modulite, Perforomist, Dulera, Symbicort, Vannair, Quikhale FBBronchodilatorAsthma
Furosemide (frusemide)Lasix, Fusid, FrumexDiureticHypertension, diuresis 
GalantamineReminyl, Nivalin, Razadyne-ER, LycoremineCholinesterase inhibitorDementia (Alzheimer's Disease) 
Garenoxacin (Only on Non US Market)GeninaxAntibioticBacterial infection 
Gatifloxacin (Removed from Market)TequinAntibioticBacterial infection 
GemifloxacinFactiveAntibioticBacterial infection 
GranisetronKytril, Sancuso, GranisolAntiemeticNausea, vomiting 
Grepafloxacin (Removed from Market)RaxarAntibioticBacterial infection 
Halofantrine (Only on Non US Market)HalfanAntimalarialMalaria 
HaloperidolHaldol (US & UK), Aloperidin, Bioperidolo, Brotopon, Dozic, Duraperidol (Germany), Einalon S, Eukystol, Halosten, Keselan, Linton, Peluces, Serenace, Serenase, SigaperidolAntipsychoticSchizophrenia, agitation 
HydrochlorothiazideApo-Hydro, Aquazide H, BP Zide, Dichlotride, Hydrodiuril, HydroSaluric, Hydrochlorot, Microzide, Esidrex, OreticDiureticHypertension, diuresis 
Hydrocodone - ERHysingla™ ER, Zohydro ERAnalgesicPain, severe 
HydroxychloroquinePlaquenil, QuineproxAntimalarial, Anti-inflammatoryMalaria, SLE, rheumatoid arthritis 
HydroxyzineAtarax, Vistaril, Aterax, Alamon, Durrax, Equipose, Masmoran, Orgatrax, Paxistil Quiess, Tran-Q, TranquizineAntihistamineAllergic reaction, anxiety disorders 
Ibogaine (Only on Non US Market)NonePsychedelicNarcotic addiction, unproven 
IbutilideCorvertAntiarrhythmicAbnormal heart rhythm 
IloperidoneFanapt, Fanapta, ZomarilAntipsychotic, atypicalSchizophrenia 
Imipramine (melipramine)TofranilAntidepressant, TricyclicDepression 
IndacaterolArcapta Neohaler (US), Onbrez Breezhaler (Canada), Utibron (combo w/ glycopyrrolate)BronchodilatorChronic obstructive lung disease
IndapamideLozol, Natrilix, InsigDiureticHypertension, diuresis 
Inotuzumab ozogamicinBesponsaAntineoplastic AgentAcute Lymphocytic Leukemia 
IsoproterenolMedihaler-Iso, IsuprelBronchodilatorAllergic reaction
IsradipineDynacircAntihypertensiveHypertension 
ItraconazoleSporanox, OnmelAntifungalFungal infection 
IvabradineProcoralan, Coralan, Corlentor, Coraxan, Ivabid, BradiaAntianginalAngina Pectoris (heart pain) 
Ketanserin (Only on Non US Market)SufrexalAntihypertensiveHypertension 
KetoconazoleNizoral, Sebizole, Ketomed, KetonAntifungalFungal infection 
LansoprazolePrevacidProton Pump InhibitorProton-pump inhibitor 
LapatinibTykerb, TyverbKinase inhibitorCancer (breast, metastatic) 
LenvatinibLenvimaAnticancerCancer (Thyroid) 
LeuprolideLupron, Eligard, Viadur, Carcinil, Enanton, Leuplin, Lucrin, Procren, Prostap and othersGonadotropin receptor agonist/antogistCancer (prostate) 
Levalbuterol (levsalbutamol)Xopenex, Levolin, AxazestBronchodilatorAsthma
LevofloxacinLevaquin, TavanicAntibioticBacterial infection 
Levomepromazine (methotrimeprazine) (Only on Non US Market)Nosinan, Nozinan, LevopromeAntipsychoticSchizophrenia 
Levomethadyl acetate (Removed from Market)OrlaamOpioid agonistNarcotic dependence 
Levosulpiride (Only on Non US Market)Lesuride, Levazeo, Enliva (with rabeprazole)AntipsychoticSchizophrenia 
LisdexamfetamineVyvanseCNS stimulantADHD
LithiumEskalith, LithobidAntimaniaBipolar disorder 
LoperamideImodium and many other OTC and Rx brandsOpiateDiarrhea 
Lopinavir and ritonavirKaletra, AluviaViral protease inhibitorHIV/AIDS 
Melperone (Only on Non US Market)Bunil, Buronil, EunerpanAntipsychotic, atypicalSchizophrenia 
Mesoridazine (Removed from Market)SerentilAntipsychoticSchizophrenia 
Metaproterenol (orciprenaline)Metaprel, AlupentBronchodilatorAsthma
MethadoneDolophine, Symoron, Amidone, Methadose, Physeptone, HeptadonOpioid agonistNarcotic dependence, pain 
Methamphetamine (Metamfetamine)Desoxyn, Pervitin, Anadrex, Methedrine, SyndroxCNS stimulantObesity, ADHD
MethylphenidateRitalin, Concerta, Focalin, Daytrana, Methylin, Metadate CDCNS stimulantADHD
MetoclopramideReglan, Afipran, Maxolon, Cerucal, Clopamon, Clopra, Maxeran, Maxolon, Metozolv, Plasil, Pramin, Primperan, PerinormAntiemeticNausea, vomiting 
MetronidazoleFlagyl and many othersAntibioticTrichomoniasis, amebiasis, bacterial infection 
MidodrineProAmatine, Amatine, GutronVasoconstrictorHypotension
MidostaurinRydaptAnti-cancerAcute myeloid leukemia 
MifepristoneKorlym, MifeprexProgesterone antagonistPregnancy termination 
MirabegronMyrbetriqBeta3 adrenergic antagonistBladder spasm 
MirtazapineRemeronAntidepressant, TetracyclicDepression 
Moexipril/HCTZUniretic, UnivascAntihypertensiveHypertension 
MoxifloxacinAvelox, Avalox, AvelonAntibioticBacterial infection 
NecitumumabPortrazzaAnti-cancerLung Cancer 
NelfinavirViraceptAntiviralViral infection (HIV/AIDS) 
NicardipineCardeneAntihypertensiveHypertension 
NilotinibTasignaKinase inhibitorCancer (leukemia) 
NorepinephrineLevophedVasconstrictor, InotropeHeart failure, shock (low blood pressure)
NorfloxacinNoroxin, AmbigramAntibioticBacterial infection 
NortriptylinePamelor, Sensoval, Aventyl, Norpress, Allegron, Noritren, NortrilenAntidepressant, TricyclicDepression 
NusinersenSpinrazaAntisense oligonucleotideSpinal Muscular Atrophy 
OfloxacinFloxinAntibioticBacterial infection 
OlanzapineZyprexa, Zydis, RelprevvAntipsychotic, atypicalSchizophrenia, bipolar disorder 
OlodaterolStriverdi RespimatBronchodilatorAsthma
OmeprazoleLosec, Prilosec, ZegeridProton Pump InhibitorGastric hyperacidity, GERD 
OndansetronZofran, Anset, Ondemet, Zuplenz, Emetron, Ondavell, Emeset, Ondisolv, SetronaxAntiemeticNausea, vomiting 
OsimertinibTagrissoTyrosine kinase inhibitorCancer (EGFR pos. NSC Lung cancer) 
OxaliplatinEloxatinAntineoplastic AgentCancer 
OxytocinPitocin, SyntocinonOxytocicLabor stimulation 
PaliperidoneInvega, XepilonAntipsychotic, atypicalSchizophrenia 
PalonosetronAloxiAntiemeticNausea 
PanobinostatFarydakHistone deacetylase inhibitorMultiple myeloma (Part of a 3 drug regimen) 
PantoprazoleProtonix and othersProton Pump InhibitorGastric hyperacidity, GERD 
Papaverine HCl (Intra-coronary)noneVasodilator, CoronaryDiagnostic adjunct 
ParoxetinePaxil, Aropax, Pexeva, Seroxat, Sereupin, SeroxatAntidepressant, SSRIDepression 
PasireotideSigniforSomatostatin analogCushings Disease 
PazopanibVotrientTyrosine kinase inhibitorCancer (renal cell, sarcoma) 
PentamidinePentamAntifungalFungal infection (Pneumocystis pneumonia) 
Perflutren lipid microspheresDefinity, OptisonImaging contrast agentEchocardiography 
PerphenazineTrilafon, Etrafon/Triavil, DecentanAntipsychoticSchizophrenia 
PhentermineAdipex P, Adiphene (India), Anoxine-AM, Ionamin, Duromine, Metermine, Miraprontv, Obephen, Obermine, Obestin-30, Phentremine, Phentrol, Phenterex, Phentromin, Pro-Fast SA, Redusa, Panbesy, Obenix, Oby-Trim, Teramine, Zantryl, Sinpet, Supremin, Suprenza, Umine, WeltmineAppetite suppressantObesity
PhenylephrineNeosynephrineVasoconstrictorShock (low blood pressure), allergic rhinitis, asthma
Phenylpropanolamine (Removed from Market)Acutrim, DexatrimAppetite suppressantObesity
Pilsicainide (Only on Non US Market)SunrythmAnti-arrhythmicArrhythmia 
PimavanserinNuplazidAntipsychotic, atypicalPsychosis, Parkinson's Disease 
PimozideOrapAntipsychoticTourette's Disorder 
Pipamperone (Only on Non US Market)Dipiperon (E.U), Propitan (Japan), Dipiperal, Piperonil, PiperonylAntipsychoticSchizophrenia 
Piperacillin/TazobactamTazosyn and ZosynAntibacterialBacterial infection 
PosaconazoleNoxafil, PosamolAntifungalFungal infection 
Primaquine phosphateAnti-malarialMalaria 
Probucol (Removed from Market)LorelcoAntilipemicHypercholesterolemia 
ProcainamidePronestyl, ProcanAntiarrhythmicAbnormal heart rhythm 
PromethazinePhenerganAntipsychotic / AntiemeticNausea, vomiting 
PropofolDiprivan, PropovenAnesthetic, generalAnesthesia 
Prothipendyl (Only on Non US Market)Dominal, Largophren, Timoval, Timovan, TumovanAntipsychoticSchizophrenia 
PseudoephedrinePediaCare, SudafedDecongestantAllergic reaction, allergic rhinitis, asthma
QuetiapineSeroquelAntipsychotic, atypicalSchizophrenia 
QuinidineQuinaglute, Duraquin, Quinact, Quinidex, Cin-Quin, QuinoraAntiarrhythmicAbnormal heart rhythm 
Quinine sulfateQualaquinAntimalarialMalaria, leg cramps 
RanolazineRanexa, RanozexAntianginalAngina Pectoris (heart pain) 
RibociclibKisqaliCyclin Dependent Kinase inhibitorBreast Cancer 
RilpivirineEdurant, Complera, EvipleraAntiviralViral infection (HIV/AIDS) 
RisperidoneRisperdalAntipsychotic, atypicalSchizophrenia 
Ritodrine (Removed from Market)YutoparMuscle relaxantPremature labor
RomidepsinIstodaxHistone deacetylase inhibitorLymphoma 
Roxithromycin (Only on Non US Market)Rulide, Xthrocin, Roxl-150, Roxo, Surlid, Rulide, Biaxsig, Roxar, Roximycinv, Roxomycin, Rulid, Tirabicin, CoroxinAntibioticBacterial infection 
SalmeterolSerevent, AdvairBronchodilatorAsthma
SaquinavirInvirase(combo)AntiviralViral infection (HIV/AIDS) 
Sertindole (Only on Non US Market)Serdolect, SerlectAntipsychotic, atypicalSchizophrenia, anxiety 
SertralineZoloft, Lustral, Daxid, Altruline, Besitran, Deprax, Elrval, Emergen, Gladem, Implicane, Sedoran, Sealdin, SerivoLowfin, Stimuloton, Tresleen, Sertralin BluefishAntidepressant, SSRIDepression 
SevofluraneUltane, SojournAnesthetic, generalAnesthesia 
Sibutramine (Removed from Market)MeridiaAppetite suppressantObesity
SolifenacinVesicareMuscle relaxantBladder spasm 
SorafenibNexavarTyrosine kinase inhibitorCancer (liver, renal cell, metastatic thyroid) 
SotalolBetapace, Sotalex, SotacorAntiarrhythmicAbnormal heart rhythm 
Sparfloxacin (Removed from Market)ZagamAntibioticBacterial infection 
Sulpiride (Only on Non US Market)Dogmatil, Dolmatil, Eglonyl, Espiride, Modal, SulporAntipsychotic, atypicalSchizophrenia 
Sultopride (Only on Non US Market)Barnetil, Barnotil, TopralAntipsychotic, atypicalSchizophrenia 
SunitinibSutentKinase inhibitorCancer (GIST, renal cell, pNET) 
TacrolimusPrograf, Prograf, Advagraf, ProtopicImmunosuppressantImmune suppression 
TamoxifenNolvadex(discontinued 6/13), Istubal, ValodexAnticancerCancer (breast) 
TelaprevirIncivo, IncivekAntiviralViral infection (hepatitis C) 
TelavancinVibativAntibioticBacterial infection 
TelithromycinKetekAntibioticBacterial infection 
TerbutalineBrethine, Bricanyl, Brethaire, TerbulinBronchodilatorAsthma, premature labor
Terfenadine (Removed from Market)SeldaneAntihistamineAllergic rhinitis 
Terlipressin (Only on Non US Market)Teripress, Glypressin, Terlipin, Remestyp, Tresil, Teriss and othersVasoconstrictorSeptic shock 
Terodiline (Only on Non US Market)Micturin, Mictrol (not bethanechol)Muscle relaxantBladder spasm 
TetrabenazineNitoman, XenazineVesicular Monoamine Transporter 2 InhibitorChorea (Huntington's disease) 
ThioridazineMellaril, Novoridazine, ThiorilAntipsychoticSchizophrenia 
Tiapride (Only on Non US Market)Tiapridal, Italprid, Sereprile, Tialaread, Tiaryl, Tiaprim, Tiaprizal, Sereprid, TiapridexSelective D2, D3 dopamine antagonistAlcoholism, withdrawal 
Tipiracil and TrifluridineLonsurfAnti-cancerMetastatic colorectal cancer 
TizanidineZanaflex, SirdaludMuscle relaxantMuscle spasticity 
TolterodineDetrol, DetrusitolMuscle relaxantBladder spasm 
ToremifeneFarestonEstrogen agonist/antagonistCancer (breast, metastatic) 
torsemide (torasemide)Demadex, Diuver, ExamideDiureticHypertension, diuresis 
TrazodoneDesyrel (discontinued 6/13), Oleptro, Beneficat, Deprax, Desirel, Molipaxin, Thombran, Trazorel, Trialodine, Trittico, MesyrelAntidepressant, SARIDepression, insomnia 
Trimethoprim-SulfamethoxazoleSeptra, Bactrim, Sulfatrim, Biseptol, Co-trimoxazole, Cotrim, Septrin, TrisulAntibioticBacterial infection
TrimipramineSurmontil, Rhotrimine, StangylAntidepressant, TricyclicDepression 
Tropisetron (Only on Non US Market)Navoban, SetrovelAntiemeticNausea, vomiting 
ValbenazineIngrezzaVesicular monamine transporter 2 inhibitorTardive Dyskinesia 
VandetanibCaprelsaAnticancerCancer (thyroid) 
VardenafilLevitraPhosphodiesterase 5 inhibitorErectile dysfunction 
VemurafenibZelborafKinase inhibitorCancer (melanoma) 
VenlafaxineEffexor, EfexorAntidepressant, SNRIDepression 
Vilanterol/fluticasone furoateBreo ElliptaBronchodilatorAsthma
VoriconazoleVFendAntifungalFungal infection 
VorinostatZolinzaHistone deacetylase inhibitorCancer (lymphoma) 
ZiprasidoneGeodon, ZeldoxAntipsychotic, atypicalSchizophrenia 
Zotepine (Only on Non US Market)Losizopilon, Lodopin, Setous and ZoleptilAntipsychotic, atypicalSchizophrenia 

Known Risk of TdP
These drugs prolong the QT interval AND are clearly associated with a known risk of TdP, even when taken as recommended.
Possible Risk of TdP
These drugs can cause QT prolongation BUT currently lack evidence for a risk of TdP when taken as recommended.
Conditional Risk of TdP
These drugs are associated with TdP BUT only under certain conditions of their use (e.g. excessive dose, in patients with conditions such as hypokalemia, or when taken with interacting drugs) OR by creating conditions that facilitate or induce TdP (e.g. by inhibiting metabolism of a QT-prolonging drug or by causing an electrolyte disturbance that induces TdP.)
Drugs to Avoid in Congenital Long QT
These drugs pose a high risk of TdP for patients with CLQTS and include all those in the above three categories (KR, PR & CR) PLUS additional drugs that do not prolong the QT interval per se but which have a Special Risk (SR) because of their other actions.