[Side effects, unwanted drug interactions and the problem of cardiotoxicity].

: The problem of drug interactions is very important in pharmacotherapy. The interactions of some drugs (antihistamines, macrolides, fluoroquinolones, cisapride) with other can induce ventricular arrhythmias. A lot of non-antiarrhytmic drugs can prolong the QT interval, induce torsade de pointes and cardiotoxicity.