Is it safe to work with dectomax shortly after your cows have had the worming blocks? I forgot to ask my vet this when we were going over my vaccination plans today. I used the blocks about 10 days ago--my vet gave me a bottle of dectomax that he wants me to begin worming with. I flat forgot about recently using the blocks. He also suggested that I give them the pour on ivomec when I get them in the chute this week, it just seems like alot at once. Does anyone else use an injectible wormer and a pour on at the same time? From reading the labels it looks like they are for many of the same parasites?