Morphine sulfate ER ("extended release") is the generic name for several long-acting prescription pain medications. Brand names include
Avinza®,
Kadian®,
MS Contin®, and
Oramorph® SR. These are rather strong narcotic painkillers approved only for use when continuous, around-the-clock use of potent opioid medication is necessary for an extended period of time (for more than a few days).
Morphine sulfate ER is meant to be used consistently at scheduled times, every 8, 12, or 24 hours (depending on the particular product and your particular needs). It is not approved for unscheduled "as needed" use. Morphine sulfate ER is often used to treat cancer pain or other types of chronic pain.
Long-acting morphine products, including morphine sulfate ER, are typically used to replace short-acting morphine or other short-acting painkillers. Often, people are started on regular, short-acting morphine at first. Once it becomes clear that long-term pain control will be necessary, long-acting products are usually preferred.