I'm always glad to hear those first-hand experiences w/ treatments, and tidbits of the actual advice vets often give ... helps me to continue to shape/improve my own methods of flock management, which already differ a bit from those of most: I'm a big fan of the natural stuff, but won't hesitate to use whatever proves safest and most effective, provided that it will not leave chemicals w/in the meat or eggs, and that the active ingredients will fully biodegrade w/in reasonable periods of time (i.e. pyrethrin comes from the flowers of chrysanthemum, and permethrin is chemically produced to function similarly, but both can be used legally in commercial kitchens, w/ soap/water cleaning of food surfaces, and will completely break down).
I raised both my guineas and my chickens w/ controlled amounts of Amprolium, and w/o changing the litter, so as to hopefully develop thier own natural resistance. I have also included Diatomaceous Earth, both on the inside and out, knowing that it would reduce the numbers of internal/external parasites, should any be present, and that it wasn't gonna hurt 'emt at all. I also add four teaspoons of Apple Cider Vinegar to each gallon of water, which is also extremely beneficial, most especially to help 'cut through' the mucus and coatings in the mouth, throat and intestines, which improves uptake of nutrients/vitamins and any meds given, and the lowering of the pH creates an extremely hostile environment for internal parasites. Rather than continuously, I phase it in and back out in about three day cycles. It's ridiculously cheap, and highly effective, and simply can't hurt one feather on your birds (perhaps that explains why there are some that still resist such compelling reasons for using it ~'-)
I'm not so sure of the effecacy of the various natural treatments and home remedies, so I keep Amprolium on hand for emergency treatment of coccidiosis (if you need it? you'll need it quickly, and it ain't always available), and Fenbendazole is my choice for treating the worms commonly found w/in chickens ... beyond seeing studies proving it to be extremely effective at suggested dosages, it's proven to be safe at dosages of over 100 times that amount, with the only concern raised being that it may mess up the emerging feathers if given during molt.
As you can tell? I tend to talk/type entirely too much, but I do my research faithfully so I can stand firmly upon my opinions. And, I tend to over-think ... well ... just about every simple lil' thing I do; always searchin' for ways to improve the way things are done w/o accepting the way they are w/o further study, and testing (which also serves as good excuse for takin' forever to get things done ~'-)
