I am a cardiologist and electrophysiologist.
I am a long term investor in Gilead.
Drug interactions are common in medical practice. Once we are aware of them, we avoid those combinations.
If somebody has Hepatitis c and arrhythmia : I will stop Amiodarone and switch him to another anti arrhythmic medication and let him take Gilead's hepatitis curing drugs for 8-12 weeks. I wonder Sovaldi/harvoni some how potentiates Amio effects and causes marked sinus node dysfunction .