The story
Probably from so(r)ta + -alol (“beta blocker”), for it is "sort of" a beta blocker due to its additional potassium channel blocking effects.
Etymology from Wiktionary, CC BY-SA 4.0.
sotalol
Today it means: A beta-adrenergic blocking agent administered in the form of its hydrochloride C₁₂H₂₀N₂O₃S·HCl to treat ventricular arrhythmias. Full definition →