No limit, but: If the treatment is not working,the assumption that you have pin worms may be wrong. Peri-anal itching is common to many food intolerance and other problems. It might be worth a real PW test to see if they are there. Mebendazole is a simple neuro-toxin to the worm and is given for prolonged periods at higher doses to treat other types of infections.
Answered 3/22/2020
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