Hifenac contains aceclofenac and is used for pain and inflammation, but its suitability depends on the person’s symptoms, medical history, and any existing health conditions. Adults, including someone who is 20, can take it when prescribed, but it should not be used without a doctor’s advice because it can cause stomach irritation, acidity, and kidney or liver-related side effects if misused. It is best to consult a doctor to confirm if Hifenac is the proper and safe option for your condition.