Merlin, also known as ibuprofen suspension, is required to be taken at 4-6 hour intervals. If fever or pain occurs within 4-6 hours after taking Merlin, you can take it a second time after a 4-6 hour interval. If there is no fever or pain of any kind within 4 hours, it is not necessary to take it. Ibuprofen suspension has a certain slow-release effect, as ibuprofen is used to relieve fever or reduce fever, it can last for 4-6 hours, if there is no fever within these 6 hours, you can not take it, but if the body temperature rises again after 4 hours, you can take it again at your discretion. The ibuprofen in ibuprofen suspension, if taken too much, can really increase the irritation of the gastrointestinal tract of infants and children, so it is recommended that Merlin, that is, ibuprofen suspension be administered at intervals of 4-6 hours, and no more than 4 times a day, in accordance with this idea to control the interval of Merlin administration.