What is Morphine: Uses, Warnings & Interactions

Updated May 14, 2025  •  Published Dec 30, 2020

Morphine sulfate is a well-known opioid pain reliever. Doctors use it to treat both short-term and chronic pain. Because of its potential hazards, they limit its use to cases where the pain is not adequately controlled by other pain medications. Healthcare professionals have several ways to administer morphine, including immediate-release versions, extended-release versions, and injections. Opioids like morphine are potentially hazardous medications, so patients should be aware of possible risks, including dependency, abuse, and overdose.

Morphine overview

BRAND NAMES:

  • Duramorph (injection), Infumorph (injection), Mitigo (injection), MS Contin (ER tablet) 

Generic Names:

  • Morphine sulfate

Uses:

  • Treats moderate to severe pain. 

Therapeutic Classes:

  • Analgesic, opioid

Forms:

  • Tablet, extended-release tablet, extended-release capsule, oral solution (liquid), suppository, injectable

How it’s taken:

  • By mouth, rectally, injected intravenously or spinally

What is Morphine used for?

Morphine relieves moderate to severe pain that cannot be adequately controlled by other analgesics.  

What form(s) does Morphine come in

  • Tablet

    • 15 mg

    • 30 mg

  • Extended-release tablet

    • 15 mg

    • 30 mg

    • 60 mg

    • 100 mg

    • 200 mg

  • Extended-release capsule

    • 20 mg

    • 30 mg

    • 40 mg

    • 50 mg

    • 60 mg

    • 80 mg

    • 100 mg

  • Oral solution (liquid)

    • 10 mg/5 mL

    • 20 mg/5 mL

    • 100 mg/5 mL

  • Suppository

    • 5 mg

    • 10 mg

    • 20 mg

    • 30 mg

  • Injection

    • 0.5 mg/mL

    • 1 mg/mL

    • 4 mg/mL

    • 8 mg/mL

    • 10 mg/mL

    • 25 mg/mL

What are common Morphine doses?

  • For moderate to severe pain:

    • Tablets: 15–30 mg every four hours to start; after that, the lowest effective dose taken every four hours

    • Extended-release tablets: 15 mg every eight to 12 hours to start; after that, the lowest effective dose taken every eight to 12 hours

    • Extended-release capsules: 30 mg every 12–24 hours to start: after that, the lowest effective dose taken every 12–24 hours

    • Oral solution: 10–20 mg every four hours to start; after that, the lowest effective dose taken every four hours

    • Suppository: 10–20 mg every four hours to start; after that, the lowest effective dose taken every four hours

    • Injections: injections are administered intravenously or into the spinal space; doses vary

Common Morphine prescriptions

  • Morphine Sulfate
    100ml of 10mg/5ml bottle

  • Morphine Sulfate
    100ml of 20mg/5ml bottle

  • Morphine Sulfate
    15ml of 10mg/5ml bottle

  • Morphine Sulfate
    500ml of 10mg/5ml bottle

  • Morphine Sulfate
    500ml of 20mg/5ml bottle

  • Morphine Sulfate
    12 suppository box

  • Morphine Sulfate
    5ml of 10mg/5ml cup

  • Morphine Sulfate
    1ml of 10mg/ml syringe

  • Morphine Sulfate
    1ml of 2mg/ml syringe

  • Morphine Sulfate
    1ml of 4mg/ml syringe

  • Morphine Sulfate
    1ml of 5mg/ml syringe

  • Morphine Sulfate
    1ml of 8mg/ml syringe

  • Morphine Sulfate
    30ml of 1mg/ml syringe

  • Morphine Sulfate
    15mg tablet

  • Morphine Sulfate
    30mg tablet

  • Morphine Sulfate
    10ml of 10mg/ml vial

  • Morphine Sulfate
    10ml of 25mg/ml vial

  • Morphine Sulfate
    1ml of 10mg/ml vial

  • Morphine Sulfate
    1ml of 15mg/ml vial

  • Morphine Sulfate
    1ml of 5mg/ml vial

  • Morphine Sulfate
    20ml of 15mg/ml vial

  • Morphine Sulfate
    20ml of 50mg/ml vial

  • Morphine Sulfate
    30ml of 150mg/30ml vial

  • Morphine Sulfate
    4ml of 25mg/ml vial

  • Morphine Sulfate
    50ml of 50mg/ml vial

How to take Morphine

  • Follow all the prescriber’s directions. The dose may need to be changed several times to find what works best for you.

  • Do not change the dose or take doses more often than instructed. An overdose can be dangerous. 

  • Call the prescriber if pain is not controlled or gets worse.

  • Do not stop taking morphine doses without first talking to the doctor.

  • Please read the Medication Guide that comes with this medicine.

  • Morphine tablets, capsules, or oral solution can be taken with food or milk.

  • How to take morphine tablets:

    • Doses are usually taken every four hours.

    • For acute pain, treatment usually lasts only a few days.

    • Swallow the tablet with a drink of water.

    • Store morphine tablets at room temperature securely out of the reach of children and other people.

  • How to take morphine extended-release tablets:

    • Doses are usually taken every eight to 12 hours.

    • Swallow the extended-release tablet whole. Do not cut, break, or chew it.

    • Store morphine extended-release tablets at room temperature in a tightly closed, light-resistant container securely out of the reach of children and other people.

  • How to take morphine extended-release capsules:

    • Doses are usually taken every 12 to 24 hours.

    • Swallow the extended-release capsule whole. Do not cut, break, or chew it.

    • If you cannot swallow a capsule, it can be opened and sprinkled on a tablespoon of cool applesauce and taken that way. Consume the mixture immediately and drink a glass of water. Dispose of the empty capsule by flushing it down a toilet.

    • Store morphine extended-release capsules at room temperature protected from light and moisture. Keep the bottle out of the reach of children and other people.

  • How to take morphine oral solution:

    • Doses are usually taken every four hours.

    • Use only a calibrated oral syringe to measure doses. Do not use kitchen measuring devices or tableware.

    • Store morphine oral solution at room temperature protected from moisture. Keep the bottle out of the reach of children and other people.

  • How to take morphine suppositories:

    • Doses are usually taken every four hours.

    • Morphine suppositories are for rectal use only.

    • Use the entire suppository. Do not break or divide it.

    • Gently remove the suppository from its plastic packet.

    • Gently insert the suppository into the rectum as far as it will go. 

    • Store morphine suppositories in their sealed packets and original carton at room temperature below 77˚F.

  • Ask the pharmacist for directions on how to dispose of leftover morphine. It should be flushed down the toilet or taken to a drug takeback center.

What to do if you miss a dose of Morphine

  • Do not take a missed or forgotten dose.

  • Take the next dose at its regular time.

  • Do not take two doses to make up for a missed dose.

Morphine contraindications

  • This medicine is not right for everyone. 

  • Do not use it if you had an allergic reaction to morphine or have:

    • Slowed breathing (respiratory depression)

    • Active or severe bronchial asthma

    • Gastrointestinal obstruction including an immobilized colon (paralytic ileus)

Morphine warnings

  • Morphine is a hazardous drug that can cause severe problems, particularly if too much is taken or the drug is misused. These problems include:

    • Slowed breathing (respiratory depression)

    • Stopped breathing (respiratory arrest)

    • Breathing problems while sleeping

    • Serotonin syndrome

    • Drug abuse

    • Dependence

    • Overdose

    • Death

  • Before starting morphine, tell the prescriber if you have:

    • Breathing or lung problems such as COPD, asthma, or sleep apnea

    • Liver problems

    • Kidney problems

    • Problems urinating

    • Thyroid problems

    • Pancreas or gallbladder problems

    • Stomach or intestinal problems

    • Low blood pressure

    • A history of seizures, head injury, or brain tumor

    • Mental health issues such as depression

    • A history of alcohol or drug abuse

  • Tell the doctor if you are pregnant, planning to become pregnant, breastfeeding, or planning to breastfeed before taking morphine.

  • This medicine may make you dizzy, drowsy, or lightheaded. Do not drive or do anything else that could be dangerous until you know how this medicine affects you. 

  • This medicine may make you constipated. The longer it’s used, the more likely you’ll experience constipation. Ask your prescribing clinician if it’s okay to use a laxative to treat constipation while taking morphine.

  • Do not stop taking morphine doses without talking to the doctor. The rapid discontinuation of morphine doses can cause severe withdrawal symptoms. The prescriber may need to slowly decrease the dose over several weeks before it can be safely stopped.

  • This medicine can be habit-forming. Do not use more than your prescribed dose. Call your doctor if you think your medicine is not working.

  • Morphine is a federally controlled substance. Sharing or giving this medicine to other people is dangerous and illegal. Keep it out of sight and out of reach of other people.

Morphine interactions

  • Morphine is a hazardous drug that can cause severe problems, particularly if too much is taken or the drug is misused. These problems include:

    • Slowed breathing (respiratory depression)

    • Stopped breathing (respiratory arrest)

    • Breathing problems while sleeping

    • Serotonin syndrome

    • Drug abuse

    • Dependence

    • Overdose

    • Death

  • Before starting morphine, tell the prescriber if you have:

    • Breathing or lung problems such as COPD, asthma, or sleep apnea

    • Liver problems

    • Kidney problems

    • Problems urinating

    • Thyroid problems

    • Pancreas or gallbladder problems

    • Stomach or intestinal problems

    • Low blood pressure

    • A history of seizures, head injury, or brain tumor

    • Mental health issues such as depression

    • A history of alcohol or drug abuse

  • Tell the doctor if you are pregnant, planning to become pregnant, breastfeeding, or planning to breastfeed before taking morphine.

  • This medicine may make you dizzy, drowsy, or lightheaded. Do not drive or do anything else that could be dangerous until you know how this medicine affects you. 

  • This medicine may make you constipated. The longer it’s used, the more likely you’ll experience constipation. Ask your prescribing clinician if it’s okay to use a laxative to treat constipation while taking morphine.

  • Do not stop taking morphine doses without talking to the doctor. The rapid discontinuation of morphine doses can cause severe withdrawal symptoms. The prescriber may need to slowly decrease the dose over several weeks before it can be safely stopped.

  • This medicine can be habit-forming. Do not use more than your prescribed dose. Call your doctor if you think your medicine is not working.

  • Morphine is a federally controlled substance. Sharing or giving this medicine to other people is dangerous and illegal. Keep it out of sight and out of reach of other people.

Morphine side effects

Serious side effects

Talk to a doctor if you notice any signs or symptoms of a possible serious side effect, including:

  • Trouble breathing, slow breathing, shallow breathing

  • Blue lips, fingernails, or skin

  • Extreme dizziness or weakness, shallow breathing, slow or uneven heartbeat, sweating, cold or clammy skin, seizures

  • Severe constipation, stomach pain, or vomiting

  • Severe confusion, lightheadedness, dizziness, or fainting

  • Anxiety, restlessness, fast heartbeat, fever, sweating, muscle spasms, twitching, nausea, vomiting, diarrhea, seeing or hearing things that are not there

  • Seizures

  • Allergic reaction: Itching or hives, swelling in your face or hands, swelling or tingling in your mouth or throat, chest tightness, trouble breathing

Less Serious Side Effects

  • Constipation

  • Nausea

  • Vomiting

  • Sleepiness

  • Feeling tired

  • Dizziness

  • Headache

  • Abdominal pain

Sources:

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