“…At therapeutic levels, venlafaxine has a thirty times higher affinity for serotonin receptors than noradrenaline receptors [20]. Venlafaxine may cause mild tachycardia, headache, dry mouth, increased HR and BP, decreased HRV, QTc prolongation, and TdP at higher doses by blockage of cardiac sodium channels, it acts like an SSRI at lower doses but is more efficacious at higher doses, so when it is prescribed in treatment-resistant depression, PTSD, generalized anxiety disorders (GAD), panic disorders close monitoring is advised to prevent adverse cardiac events like tachyarrhythmias, hypertensive crisis, angina, extra-systoles, CHF and SCD [2,6,[8][9][10]15,16,[20][21][22]. Inhibition of cardiac and vascular Ca2+, K+, and Na+ channels by SSRIs and SNRIs may be associated with cardiac adverse events in susceptible patients [23].…”