Morphine is an OPIATE and NARCOTIC drug that has been used for centuries to treat pain. It is derived from the opium poppy plant and is one of the most powerful and commonly used painkillers. Morphine is highly addictive and can cause serious side effects, including respiratory depression, constipation, and nausea. It is often prescribed for short-term pain relief, but long-term use can lead to dependence and addiction.