It is not abnormal for a mare to be uncomfortable after foaling as the uterus still contracts for awhile afterwards. I wanted to point out that since Banamine is a smooth muscle relaxant it is a good idea to wait until the placenta is passed before giving it. Smooth muscle contraction in the uterus is needed to pass the placenta.
Also, there can be negative consequences from giving too much Banamine. It is similar to Bute in that it can cause kidney damage at high doses especially if the mare is dehydrated. Dose her according to her weight and err on the side of a little low. This should be able to control her normal post foaling pain. If she has uncontrollable pain at normal doses you should always consider a more serious problem such as those already mentioned or a surgical colic.
Michelle Courtemanche DVM
Also, there can be negative consequences from giving too much Banamine. It is similar to Bute in that it can cause kidney damage at high doses especially if the mare is dehydrated. Dose her according to her weight and err on the side of a little low. This should be able to control her normal post foaling pain. If she has uncontrollable pain at normal doses you should always consider a more serious problem such as those already mentioned or a surgical colic.
Michelle Courtemanche DVM