I had visual snow for just a week, while I was taking 150 mg of diclofenac, an NSAID which is also a potassium channel opener. I stopped, the VS stopped Can anyone else relate? It doesn’t make sense, because diclofenac is used as migraine pain reliever. Could it be due to a difference between diclofenac sodium and diclofenac potassium? But if the VS ever comes back to stay, I think I’ll try experimenting with a potassium channel blocker like Tikosyn (dofetilide) An anti-arrhythmic, it can be dangerous, so I’ll have carefully controlled conditions.