Fenbendazole.org suggested to take fenbendazole cycles 3 days on, 4 days off. When using 3 times a week, be sure to interpose at least 4-6 weeks breaks between the cycles or if you use 2 times a week then 5-6 weeks between the first and second cycle.
If one gets stomach discomfort then should stop taking it and if it reoccurs after restarting then this person should not take it again. If there's no stress on your liver and kidneys - you're fine.
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Fenbendazole Side Effects, Toxicity and Warnings
Fenbendazole side effects are rare, according to the drug’s information sheet. A few cases of anorexia or stomach ache have been reported. More frequently observed adverse reactions include diarrhea, vomiting and transient depression in some dogs. The following has also been reported: swellings of the face, eyelids or lips; erythema multiforme (red skin lesions that form blisters); erythroderma (total skin eruption) with alopecia (hair loss). Oral cavity ulcerations have also been noted. Other toxic effects are pallor of mucous membranes, hyperemia of pharynx, ulcers on oral mucosa, angular stomatitis, inflammation of the gums, tongue or lips. On rare occasions, these have been accompanied by anorexia, hypersalivation and lethargy.