It is normal for patients with high fever to sweat after taking Merlin fever medicine, which usually indicates that the medicine is playing a role in reducing fever. In addition, a lot of potassium and sodium ions will be lost through sweat, so it is also necessary to replenish electrolytes in time to prevent electrolyte disorders. The main component of Merlin is ibuprofen, a non-steroidal anti-inflammatory drug that has a good effect on reducing fever and relieving pain. Usually patients with high fever will have sweating and a drop in body temperature about 0.5-1 hour after taking Merlin, and the effect of reducing fever can last for 3-4 hours, and if the fever returns, Merlin can be repeated every 4-6 hours.