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usually acts within 6-8 hours. As there is very high risk of transmission between family members all family member should take the medicine simultaneously even if there is not any symptom. Repeat the dose after 14 days for better effect. Beside this maintain good hygiene.
-If you have threadworms, it's important to shower in the morning in order to remove eggs and bacteria from the anal area.
-Wash your hands thoroughly after each visit to the bathroom and before each meal.
-Underwear should be changed daily.
-Bedsheets should be changed frequently, especially 7 to 10 days after the treatment.
-Infected children and adults should keep their nails short.
-Infected children should ideally wear cotton gloves when sleeping.
-Clean your home thoroughly, especially the bedrooms, and remove as much dust as possible.
-Do not eat food in your bedroom
I hope this answers your query effectively.
In case you have additional questions or doubts, you can forward them to me, and I shall be glad to help you out.
Please accept my answer in case you do not have further queries.
Wishing you and your family good health.