It may need to be purchased at a vet's office in Canada, and will be called Amprol. They should sell you what you need. Dosage is 2 tsp of the liquid or 1.5 tsp of the powder per gallon on water for 5 to 7 days. Afterward, it would be best to give several days of vitamins and probiotics to replace beneficial bacterial and vitamins in the gut. Did you read the links for Mareks disease that I gave you in your first thread? Here is the thread, and they are in post number 3: https://www.backyardchickens.com/t/919073/unbalanced-laying-to-one-side-pullet
It's 2tsp for liquid?? Oops I though it was 1tsp.