(Pic from twitter, more detailed description from FA)
Off Label Mixology (Unclothed)
When using commercially available transformation potions, it is not advised to mix effects. Crossing potions can cause unexpected results and irreversible side effects! Always consult the labels for relevant information and when in doubt, speak with an alchemical professional.

... so yeah, turns out mixing half of a feral horse transformation potion with an entire gender swapping potion will NOT turn you into an anthro horse girl! Good to know! Uhh... but it seems the effects are kinda stuck too. Oh boy, how am I gonna get a job like this!?

Better get used to it, I suppose~

Clothed version: https://www.furaffinity.net/view/43038664/