Because this would be extremely dangerous, as there potassium
channels are quite ubiquitous (meaning in almost all cells).
And the common potassium channel blocker are class iii anti-arrthymics (amiodarone
, dronedarone, ibutilide, dofetilide
, vernakalant, and azimilide) and they can cause qt prolongation which can lead to fatal ventricular arrthymias. So it wouldn't be wish to have otc.
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