<s>[INST] My 6 year old has been diagnosed with pinworm today and has taken the dose of vermox this morning. How long does this take to work please? When will all the worms be dead and out of his system? Been told to repeat the dose (5ml) in 2 weeks time aswellMany thanks [/INST] Hi...usually the drug works in 24-48 hours. Your doctor was right, you need to repeat the dose in 10-14 days time.Hope my answer was helpful for you. Happy to help anytime. Further clarifications and consultations on Health Care Magic are welcome.Dr. Sumanth MBBS., DCH., DNB (Paed). </s>