Almost daily I come across confusion and mayhem. Partly caused by miscommunication, partly by misleading information from forums and quite a bit from ear mites.
There is one thing we can all do to help ourselves.
Read the packaging - And if the information is not there or is incomplete then don't buy.
This especially applies to wormers and feeds.
and below two case studies from just yesterday which underscore the need
No brand names mentioned, but one company makes a tapeworm only wormer. Active ingredient 1mg/1kg body weight. In combination with another wormer (for an all in one) the dose is 2.5mg/1kg body weight. The active ingredient may cause a problem for some horses with particular health problems. The manufacturer has stated doses on the packet, but the vet, advising on which wormers to use seems unaware of the different drug amounts.
Regarding feeds - a respiratory aid is more or less a solid block of molasses. Owner of lami pony advised it is safe to feed to laminitics,
I rest my case.