XEN1101 binds to Kv7.4 somewhat well actually, with a Kv7.4 IC50 of 113nm, vs. an established Kv7.2/3 IC50 of 27nm, which is somewhere around 4x less potent, but if tolerable at large doses, some effect would be observed.
It would be nice though if Acousia Therapeutics' Kv7.4 activator got...