Long QT Drugs

It is important to be aware of commonly used drugs that may cause QT prolongation. As QT prolongation may lead to potentially fatal arrhythmias such as Torsades de Pointes.

The list below summarises the more commonly used drugs that cause QT prolongation. A more exhaustive list can be found in the links.

Antimicrobials

Erythromycin
Clarithromycin
Ciproflaxacin
Moxifloxacin
Fluconazole
Ketoconazole

Antiarrhythmics

Procainamide
Sotalol
Quinidine
Amiodarone
Flecainide

Antipsychotics (all have some risk)
Risperidone
Haloperidol
Chlorpromazine
Quetiapine
Clozapine

Antidepressants

Citalopram
Fluoxetine
Amitriptyline
Clomipramine
Dosulepin
Doxepin
Imipramine
Lofepramine

Antiemetics

Domperidone
Droperidol
Ondansetron
Granisetron

Others

Methadone
Hydroxychloroquine
Chloroquine
Quinine
Some antiretrovirals
Loratadine