tx and ppx for cluster HA,”tx: 100% O2 and sumatriptanppx: verapamil, Li June 22, 2017 mfadmin Medicine Average Rating 0 out of 5 stars. 0 votes.You must log in to submit a review. tx and ppx for cluster HA,”tx: 100% O2 and sumatriptanppx: verapamil, Li ergotamine”