Flecainide hydrochloride is a potent and orally active antiarrhythmic agent widely used in the treatment of various cardiac arrhythmias. It belongs to the class IC antiarrhythmic drugs, which are known for their strong sodium channel-blocking properties. Flecainide hydrochloride primarily works by inhibiting the cardiac fast inward sodium current (INa) and the rapid component of the delayed rectifier potassium current (IKr), leading to a prolongation of the action potential duration (APD) in both ventricular and atrial muscle fibers. Its unique electrophysiological effects make it particularly effective in managing certain types of arrhythmias, including fetal tachycardias.

Providing storage is as stated on the product vial and the vial is kept tightly sealed, the product can be stored for up to 24 months.
Wherever possible, you should prepare and use solutions on the same day. However, if you need to make up stock solutions in advance, we recommend that you store the solution as aliquots in tightly sealed vials at -20°C. Generally, these will be useable for up to one month. Before use, and prior to opening the vial we recommend that you allow your product to equilibrate to room temperature for at least 1 hour.