The most common drugs ingested which prolong QRS and QT intervals and cause bradyarrhythmias are:
# These drugs may also cause tachyarrhythmias
* These drugs are often referred to as having ' quinidine-like' effects, 'membrane-stabilising' properties or 'nonspecific toxicity'.
Features that help to differentiate between these drugs are:
It is important to try to make the correct diagnosis, as there are often specific treatments available.