Why Did Inner Brow Drooped After Botox?

Medial brow ptosis or descent of the central brow can occur for several reasons and is often due to an inexperienced injector:
-Botox placed too low within the frontalis muscle along the forehead including central forehead.  The frontalis muscle elevates the forehead and by decreasing activity here the central brow can drop
-Botox placed too superficially along the corrugator.  The botox will again impact the frontalis muscle and paradoxically lower the central brow.
Botox is best injected by an experienced injector to lessen wrinkles while improving facial appearance.

It sounds like you had too much Botox injected into the frontalis muscle compared to the medial eyebrow depressors( the obicularis, procerus and corregators). The correction is the "Medial Botox Brow Lift" a small amount of botox into the depressor muscles to elevate the medial brow.

The position of the eyebrow and its shape is the result of a balance between opposing muscle groups. Muscles in the forehead lift the eyebrows. Muscles below the eyebrow pull the eyebrow down. When the lifter muscle of the forehead is weakened, the brow will fall. Depending on how this occurs, the muscles of the forehead that are still able to contract are recruited to lift the eyebrow. This is where those funny post-BOTOX looks come from. In some cases, the doctor has done such a through job freezing everything that nothing in the forehead can move. We see this effect in some of our actresses (think bat forehead) and gosh it is not a good look. But then who would tell Emperoress that she is not wearing any clothes?
Your treatment is at its maximum now three weeks after the injections. The effects will gradually wear off over the next three months. Find a new treating physician or encourage you current doc to avoid direct treatment into the forehead. Look at my microdropletTM BOTOX method on my website which describes my patent pending method of performing a BOTOX forehead lift.