Don't use it, it's likely to have gone bad
Dierno Ibuprofen Suspension can usually be stored for 1-3 months after opening. Ibuprofen suspension is mainly used for children's common cold or influenza, the specific time effect of the drug should be used in accordance with the instructions, when the drug has changed shape should not continue to use. When the suspension is used up, the cap should be tightened to prevent denaturation of the drug and stored in a cool place away from direct sunlight. The drug is symptomatic and therapeutic and is generally not recommended for long-term use by patients.