<unk>  is contraindicated in sick sinus syndrome. It should also not be used concomitantly with potent inhibitors of CYP3A4, including azole antifungals (such as ketoconazole), macrolide antibiotics, nefazodone and the antiretroviral drugs nelfinavir and ritonavir. Use of<unk>  with verapamil or diltiazem is contraindicated.
Ivabradine
Lofexidine
Setiptiline
Maprotiline
Verapamil
Nortilidine
Veratridine
Procainamide