Pain relief and other side effects of morphine usually wear off within 4–6 hours. It may still be present in the urine for 12–36 hours and in the blood for 1.5–4.5 hours. Morphine is a potent opioid ...

Overview: Morphine is used to treat short-term and long-term pain when other medicines are not enough. It keeps you from feeling pain. Common side effects include constipation, itching, dizziness, and ...