I must have bought a knockout potion by accident. Try this one instead. And if that doesn't work, then try this one. And if that still doesn't work, then try this one.
Oh come on... Blame the fact that all the potions you keep taking are mixing together to create unusual effects. Also, let's not forget that the potions have a different effect on every creature. So, it could still be reliable.
Right, apparently the potion is still active. Fascinating! ....what? Oh right!
*casts a dispel and the cod stops shrinking*
I presume we will have to wait until the potion wears out. Looks like I cannot dispel the curse itself right now. Too many effects at once make any more intervention very hazardous