Hello Ibugesic plus contains NSAIDs, and action takes in about 30 mins to 6 hours. It takes about 3 days for it to cure a primary fever in right doses, should be given 3 times a day. There are other primary medications to try before you give ibugesic plus in children depending on condition. When the child has 102 fever, you should immediately consult a pediatrician to rule out complex illnesses and get right doses for his age and weight. Practo has an online consultation facility available.