Hi cmsearles,
Worming is a tough issue. Your vet, also is kind of on a spot. Basically, I think a vet cannot recommend an "off label" use for a worming product. In addition to that, a good vet will do the least threatening and least invasive method to treat your hens.
My vet recommended (this is a long time ago) to use Wazine. (The directions are on the bottle, and bottles can be bought in feed stores,
TSC, and on line.) Wazine needs to be readministered in 10-days...it is put in the chickens water source, and some effort needs to be made to insure that they are drinking from THAT source and not others. There is, I believe a 14-day egg discard period. (these ideas can be checked online...)
Trouble (besides egg discard) is that Wazine will only kill round worms. That is the most common worm that afflicts chickens. Other worms require different medications.
Perhaps some worming experts will come by and provide their expertise, or you can type in worming on the search bar at the top and see a large number of threads about worming. Eventually, you will probably want to get a regular worming program for your chickens optimum health and well being.
Regarding your original question, I suspect that you will get mixed reviews on Verm-X..