Drugs That May Provoke Life-threatening Arrhythmias in LQTS*

Antiarrhythmics
Amiodarone, Disopyramide, Dofetilide, Ibutilide, Procainamide, Quinidine,
Sotalol

Antimicrobial &Antifungals
Amantadine (Symmetrel), Azithromycin, Chloroquine, Clarithromycin
(Biaxin), Clindamycin (Cleocin)**, Erythromycin, Gatifloxacin, Halofantrine,
Itraconazole, Moxifloxacin (Avelox), Pentamidine (NebuPent), Sparfloxacin
(Zagam), Sulfamethoxazole-Trimethoprim (Bactrim, Septra)

Psychotropics
Dolasetron (Anzemet), Doxepin (Sinequan), Haloperidol (Haldol),
Levacetylmethadol (Orlaam), Mesoridazine (Serentil), Phenothiazines,
Risperidone (Risperdal), Thiothixene (Navane), Thioridazine (Mellaril),
Thorazine, Tricyclics, Ziprasidone (Geodon)
Others
Albuterol (Proventil), Bepridil (Vascor), Diuretics (water pills), Epinephrine
(Adrenaline), Felbamate (Felbatrol), Ketanserin, Methadone, Pimozide
(Orap)
* Some drugs are unsafe only when used in combination with other drugs.
** Based on limited data from case reports.