"Because ibogaine inhibits cardiac ion channels in therapeutic concentrations, the drug is potentially proarrhythmic. The risk of its administration, however, is possibly reduced by the fact that the drug also shows antiarrhythmic properties."
Source
Xaver Koenig, Michael Kovar, Lena Rubi, Ágnes K Mike, Péter Lukács, Vaibhavkumar S Gawali, Hannes Todt, Walter Sandtner and Karlheinz Hilber, "The anti-addiction drug ibogaine inhibits cardiac ion channels: a study to assess the drug’s proarrhythmic potential," BMC Pharmacology and Toxicology 2012, 13(Suppl 1):A38 doi:10.1186/2050-6511-13-S1-A38.
