Merlin and Tylenol alternate at least 4 hours apart. Merlin has a longer duration of antipyretic effect, Tylenol can be used 6 hours after taking Merlin, and Tylenol has a shorter duration of drug action, Merlin can be taken 4 hours after taking Tylenol. Merlin is the trade name of ibuprofen suspension, Tylenol is the trade name of acetaminophen suspension drops, both drugs belong to the non-steroidal antipyretic and analgesic drugs. Merlin and Tylenol should be avoided at the same time, the use of one of the drugs is not effective, you can alternate the use of the other drug. Merrill is more effective in reducing high fever above 39℃, with smooth and long-lasting effect, lasting for more than 6h, and has a certain anti-inflammatory effect. Tylenol is rapidly absorbed orally, with relatively little stimulation to the digestive system, and has good effect on low to moderate fever, but the duration of action of the drug is relatively short, and does not have anti-inflammatory effects.