Itching coming back on the sixth day after albendazole often means reinfection, not treatment failure. Pinworm eggs survive on hands, nails, underwear and bedding for days, so reinfecting yourself is very common even after the medicine works the first time.
Next Steps
Please ask your doctor or pharmacist whether and when a second dose makes sense for you, since the right spacing depends on the product. Alongside any repeat dose, wash bedding and underwear in hot water daily, trim nails short, and wash hands well after using the toilet.
Health Tips
See a doctor if the itching is severe, there is bleeding, or it does not settle even after hygiene steps and a doctor-advised repeat dose.