You need to switch to Fenbendazole 10% in paste form, all seed and feed stores for animals (horses) have this for around 10 bucks per tube.
Equimax is przi with 1% ivermectin, it is 7bucks a tube.
Pamoate pyrantel paste is there also and it needs to be taken with the praziver paste (Equimax).Many online tack shops for horses also sell these three meds cheap.
I've been helping others to improve to the point of getting their life back, for over five years.
Contact me for the correct dosages and regimen of treatments.