I've considered this.
I sweat so much my forehead needs wind-shield wipers.
Trouble is that over time you need more and more injections and the effects last for less & less time.
Its yet another expense added on to wearing hair.
Your GP can prescribe a topical anti-sweat remedy thats a fraction of the price.
Problem with that is that you have to have regular access to the scalp to apply it.
You can also have your sweat glands removed surgically.
Sounds drastic but at least its a one-off expense.

I really hope someone who has tried the botox route replies to this.