To the best of my knowledge, a single dose of Safeguard/Panacur (fenbendazole) will not treat capillary worms unless it's given as a massive dose (100 mg/kg - 0.45 ml per pound). Even then it might not be effective.In the case of peafowl, however it is usually given in one acute dose on a regular schedule because peafowl are not easily handled or handled often. This is one point of contention that people get confused with. Different rules apply to different birds.
FYI, this 10% Safeguard/Panacur (fenbendazole) prescription was written for peafowl:
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