Can I mix Cydectin and Valbazen to get her to give as a wormer for barberpole? I mean in the same drench needle. I have done this several times already but just had a thought. I give about 7-1/2 ml Cydectin and 7-1/2 ml of Valbazen and drench it down the hatche. I think a vet told me it was ok to do.