Atropine

Patients with bradycardia are treated with atropine. Atropine is a muscarinic antagonist, which can obstruct the muscarinic receptor and acetylcholine cannot bind to the receptor for sustaining transmission of nerve signals to the heart through the parasympathetic nervous system. This allows an increase in heart rate. Hyperthermia, dilated pupils and dry mouth are side effects associated with the use of atropine.