Verapamil use and M in General Board Posted September 24, 2015 Thanks for your advice! Yes, I have O2. Use it in large quantities these days. No other medicines besides verapamil. I am worried to get off the Verapamil as I am afraid the cluster will hit me hard. Besides Doctors told me to taper off the vera in a very slow modus so 5 days is not enough for me and a longer period to taper off: I am too afraid cluster will hit me hard. I Have CCH along with 24/7 headache which is all related, my doctors say. I tried Energy drinks in the past but with not much result.