If Merlin is used to reduce fever, a significant fever-reducing effect usually begins to appear about 10 minutes after administration. Merlin is a trade name and its generic name is ibuprofen suspension. Ibuprofen suspension is widely used for fever caused by common cold or influenza in children, and also for the relief of mild to moderate pain in children. It should not be used more than four times a day within 24 hours, as excessive use may cause some side effects in children. The most common adverse effect of ibuprofen suspension, also known as Merlin, is that it can cause gastrointestinal irritation, such as nausea and vomiting, and it is recommended that this medication be given to children after meals.