:Lortab is a medicine to treat opioid problem.The dosage is based on your medical condition and response to treatment. Children's dosage is also based on weight. Pain medicine work best if they are used as the first signs of pain occur. If you wait until the pain has worsened, the medication may not work as well.If you have ongoing pain (such as due to cancer), your doctor may direct you to also take long-acting opioid medications. In that case, this medication might be used for sudden breakthrough,its quite well.