Hi - I have a sick hen - she's less than a year old, but I brought her in because she started gaping. I first thought she had a respiratory infection, so I brought her in to keep her warm and help her. But this morning, she passed a large round worm. In researching more, I'm wondering if she doesn't have gapeworm, too. So since she has roundworms, I bought the Safeguard (since it'll treat both according to a different post) and gave her the .5 cc dosage as I saw on another post. My question is, if she does have the gapeworms, how long does it take to work so that way I know that was what she had (and if it doesn't work, then I will have to figure out what else she may have). She is eating very very little and drinking a little. She is pooping, but not a whole lot. Thanks!