I think personally, if the bute worked, you can use an alternative called Bute x which is more herbal, Global herbs make this and i think for 250grams is about £16.00. Good luck
Personally i do not like them, as someone else stated, they do not get the horse working through the back, its more of holding the head in and nothing else matters, i would prefer to do lunge work in side reins, depends on what personally you are trying to achieve. <font color="pink"> </font>...