Generic name: morphine sulfate (oral)
Dosage form: oral tablet, extended release (15mg, 30mg, 60mg, 100mg, 200mg)
Drug class: Opioids (narcotic analgesics)

Medically reviewed by Melisa Puckey, BPharm. Last updated on Mar 1, 2024.

What is MS Contin?

MS Contin (morphine) is a strong prescription pain medicine used for around-the-clock, long-term treatment of moderate to severe pain in adults. MS Contin is used when other pain treatments do not treat the pain well enough or cannot be tolerated.

MS Contin should not be used to treat pain that can be controlled by medication that is taken as needed.

MS Contin belongs to a class of medicines called opiate (narcotic) analgesics. Morphine works by changing the way the brain and nervous system respond to pain.

MS Contin side effects

Get emergency medical help if you have signs of an allergic reaction to MS Contin: hives, difficult breathing, swelling of your face, lips, tongue, or throat.

Opioid medicine can slow or stop your breathing, and death may occur, especially if you drink alcohol or use other drugs that cause drowsiness or slow breathing. A person caring for you should give naloxone and/or seek emergency medical attention if you have slow breathing with long pauses, blue colored lips, or if you are hard to wake up.

Morphine may cause serious side effects. Call your doctor at once if you have:

• slow heart rate, weak pulse, fainting, slow breathing (breathing may stop);

• chest pain, fast or pounding heartbeats;

• extreme drowsiness, feeling like you might pass out; or

• decreased adrenal gland hormones - nausea, vomiting, stomach pain, loss of appetite, feeling tired or light-headed, muscle or joint pain, skin discoloration, craving salty foods.

Serious breathing problems may be more likely in older adults and people who are debilitated or have wasting syndrome or chronic breathing disorders.

Seek medical attention right away if you have symptoms of serotonin syndrome, such as: agitation, hallucinations, fever, sweating, shivering, fast heart rate, muscle stiffness, twitching, loss of coordination, nausea, vomiting, or diarrhea.

Common MS Contin side effects may include:

• drowsiness, dizziness, tiredness, anxiety;

• nausea, vomiting, stomach pain, gas, or constipation;

• sweating, low oxygen levels (shortness of breath), feeling light-headed; or

• feelings of extreme happiness or sadness.

This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

Related/similar drugs

Warnings

You should not take MS Contin if you have severe asthma or breathing problems, a blockage in your stomach or intestines, or a bowel obstruction called paralytic ileus.

Morphine can slow or stop your breathing, and may be habit-forming MISUSE OF MS CONTIN CAN CAUSE ADDICTION, OVERDOSE, OR DEATH, , especially in a child or other person using the medicine without a prescription. Keep the medication in a place where others cannot get to it.

Taking MS Contin during pregnancy may cause life-threatening withdrawal symptoms in the newborn.

Fatal side effects can occur if you use MS Contin with alcohol, or with other drugs that cause drowsiness or slow your breathing.

Before taking this medicine

You should not take MS Contin if you have ever had an allergic reaction to morphine or other opioid medicines, or if you have:

• severe asthma or breathing problems;

• a stomach or bowel obstruction (including paralytic ileus); or

• if you have used an MAO inhibitor in the past 14 days, such as isocarboxazid, linezolid, methylene blue injection, phenelzine, or tranylcypromine.

To make sure MS Contin is safe for you, tell your doctor if you have ever had:

• chronic obstructive pulmonary disease (COPD), sleep apnea, or other breathing disorder;

• a head injury, brain tumor, high pressure inside the skull, or seizures;

• a drug or alcohol addiction, or mental illness;

• urination problems;

• problems with your bile duct, gallbladder, pancreas, thyroid, or adrenal gland; or

• liver or kidney disease.

Tell your doctor if you also use stimulant medicine, other opioid medicine, herbal products, or medicine for depression, mental illness, Parkinson's disease, migraine headaches, serious infections, or prevention of nausea and vomiting. An interaction with morphine could cause a serious condition called serotonin syndrome.

Morphine may harm an unborn baby. Tell your doctor if you are pregnant or plan to become pregnant. If you use MS Contin during pregnancy, your baby could be born with life-threatening withdrawal symptoms, and may need medical treatment for several weeks.

Long-term morphine use may affect fertility in men or women. Pregnancy could be harder to achieve while either parent is using MS Contin.

Do not breastfeed. Morphine in breast milk can cause life-threatening side effects in a nursing baby.

How should I take MS Contin?

Take MS Contin exactly as prescribed by your doctor. Follow the directions on your prescription label and read all medication guides or instruction sheets. Never use MS Contin in larger amounts, or for longer than prescribed. Tell your doctor if you feel an increased urge to use more MS Contin.

Never share opioid medicine with another person, especially someone with a history of drug addiction. MISUSE CAN CAUSE ADDICTION, OVERDOSE, OR DEATH. Keep the medicine where others cannot get to it. Selling or giving away MS Contin is against the law.

Never crush a pill to inhale the powder or inject it into your vein. This could result in death.

Swallow the extended release tablet whole to avoid exposure to a potentially fatal overdose. Do not crush, chew, break, open, or dissolve.

Call your doctor if your symptoms do not improve, or if they get worse.

You should not stop using MS Contin suddenly. Stopping suddenly may cause withdrawal symptoms. Ask your doctor before stopping the medicine.

Your dose needs may change if you switch to a different brand, strength, or form of morphine. Avoid medication errors by using only the medicine your doctor prescribes.

Do not keep leftover medicine. Just one dose can cause death in someone using MS Contin accidentally or improperly. Ask your pharmacist about a drug take-back program,or flush the unused medicine down the toilet.

Store tightly closed at room temperature, away from moisture, heat and light. Keep your medicine in a place where no one can use it improperly.

What happens if I miss a dose?

Since MS Contin is used for pain, you are not likely to miss a dose. Skip any missed dose if it is almost time for your next dose. Do not use two doses at one time.

What happens if I overdose?

Seek emergency medical attention or call the Poison Help line at 1-800-222-1222. An overdose can be fatal, especially in a child or person using opioid medicine without a prescription. Overdose symptoms may include severe drowsiness, pinpoint pupils, slow breathing, or no breathing.

Your doctor may recommend you get naloxone (a medicine to reverse an opioid overdose) and keep it with you at all times. A person caring for you can give the naloxone if you stop breathing or don't wake up. Your caregiver must still get emergency medical help and may need to perform CPR (cardiopulmonary resuscitation) on you while waiting for help to arrive.

Anyone can buy naloxone from a pharmacy or local health department. Make sure any person caring for you knows where you keep naloxone and how to use it.

What should I avoid while taking MS Contin?

Do not drink alcohol. Dangerous side effects or death could occur.

Avoid driving or hazardous activity until you know how MS Contin will affect you. Dizziness or drowsiness can cause falls, accidents, or severe injuries. Also avoid getting up too fast from a sitting or lying position, or you may feel dizzy.

What other drugs will affect MS Contin?

Many other drugs can be dangerous when used with opioid medicine. Tell your doctor if you also use:

• medicine for allergies, cough, asthma, blood pressure, motion sickness, irritable bowel, or overactive bladder;

• other opioid pain medicine or prescription cough medicine;

• cimetidine, verapamil, quinidine;

• sleep medicine, muscle relaxers, or other drugs that make you drowsy; or

• a benzodiazepine sedative like Valium, Klonopin, or Xanax.

This list is not complete and many other drugs may interact with morphine. This includes prescription and over-the-counter medicines, vitamins, and herbal products. Not all possible drug interactions are listed here.

Ingredients

Active ingredient: morphine sulfate.
Inactive ingredients: cetostearyl alcohol, hydroxyethyl cellulose, hypromellose, magnesium stearate, polyethylene glycol, talc and titanium dioxide.

Manufacturer

Marketed By: Rhodes Pharmaceuticals L.P., Coventry, RI, 02816, USA.

Popular FAQ

More FAQ

• Which painkiller should you use?

View more FAQ

Further information

Remember, keep this and all other medicines out of the reach of children, never share your medicines with others, and use MS Contin only for the indication prescribed.

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.

Medical Disclaimer

Copyright 1996-2025 Cerner Multum, Inc. Version: 18.01.