What drugs cause this?
The intake of certain medications can prolong the QT intervals. These medications include certain antibiotics, antidepressants, cholesterol-lowering agents, diuretics, antipsychotics, antifungal medications, antihistamine, oral hypoglycemic and some heart medications. Researchers have identified that people who suffer from drug-induced LQTS are genetically predisposed or at risk of LQTS when exposed to certain drugs. For further information have a look here: https://www.symptoma.com/en/info/long-qt-syndrome