Morphine

Opioids

Also known as: MS Contin, Roxanol, Kadian, M, Morph, Dreamer

Medical Review & Editorial Standards

All content is written, edited, and medically reviewed by licensed professionals with expertise in addiction medicine and behavioral health.

Author

Benjamin Zohar

NCACIP

Nationally Certified Advanced Clinical Intervention Professional and recovery advocate in long-term recovery, specializing in intervention services and treatment coordination.

Editor

Ezra Zohar, M.S.Ed.

Educational Specialist

Educational Specialist with M.S. in Secondary Education, reviewing educational content focused on addiction awareness and recovery.

Medical Reviewer

Brandon McNally

Registered Nurse with specialized training in addiction medicine and behavioral health nursing.

Last Updated

November 2025

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What is Morphine?

Morphine is a naturally occurring opioid alkaloid derived from the opium poppy. It is the prototype opioid against which all other pain medications are measured. Morphine has been used medically for over 200 years and remains one of the most effective medications for severe acute and chronic pain. The drug works by binding to mu-opioid receptors in the central nervous system, blocking pain transmission and altering emotional response to pain. It is available in immediate-release and extended-release formulations under various brand names including MS Contin, Kadian, and Roxanol. Morphine is commonly used in hospitals for post-surgical pain, severe injury, cancer pain, and end-of-life care. Its powerful pain-relieving properties also make it highly susceptible to abuse and addiction.

Effects

Morphine produces powerful pain relief, intense euphoria, deep relaxation, and sedation. Users experience reduced anxiety, warmth, contentment, and detachment from physical and emotional pain. The drug causes drowsiness, mental clouding, and slowed thinking. Physical effects include constricted pupils, slowed breathing and heart rate, reduced blood pressure, constipation, nausea, and itching. Users may experience "the nods" - drifting between consciousness and sleep. Some people describe a rush of pleasure when injected intravenously.

Risks & Dangers

Respiratory depression is the primary cause of morphine overdose deaths. The drug slows breathing to dangerous levels, especially when combined with alcohol, benzodiazepines, or other depressants. Overdose symptoms include unconsciousness, blue lips and fingernails, cold clammy skin, and death. Chronic morphine use leads to physical dependence, tolerance, severe constipation, hormonal disruptions, and immune system suppression. Injection use carries risks of collapsed veins, infections, HIV, hepatitis C, and endocarditis (heart valve infection). Morphine significantly impairs judgment, coordination, and reaction time, making operation of vehicles or machinery extremely dangerous.

Withdrawal Symptoms

Withdrawal begins 6-12 hours after last dose and peaks at 36-72 hours. Symptoms include severe muscle and bone pain, restlessness, insomnia, severe anxiety, cold sweats, goosebumps, dilated pupils, runny nose, nausea, vomiting, diarrhea, rapid heartbeat, elevated blood pressure, and intense cravings. Acute withdrawal lasts 7-10 days with lingering symptoms for months.

Addiction Potential

Extremely high. Morphine is highly addictive with both physical and psychological dependence developing rapidly. Medical patients can become dependent within weeks of regular use. Tolerance develops quickly, requiring progressively higher doses. The euphoric effects drive psychological addiction.

Duration

Immediate-release: Effects begin in 15-30 minutes, peak at 1 hour, last 3-4 hours. Extended-release: Effects begin in 1-2 hours, last 8-24 hours depending on formulation. Intravenous injection produces immediate effects.

Legal Status

Schedule II controlled substance in the United States. Available only by prescription for legitimate medical purposes. Unauthorized possession or distribution is a serious federal crime with significant prison sentences.

Dosage Information

Medical dosing varies widely based on pain severity, prior opioid exposure, and formulation. Starting doses for opioid-naive patients: 5-15mg every 4 hours for immediate-release. Extended-release: 15-30mg every 12-24 hours. Chronic pain patients may require 200mg+ daily. Recreational users take dangerous doses of 30-100mg+ significantly increasing overdose risk.

Alcohol Interaction Warning

Mixing Morphine with alcohol can be extremely dangerous and potentially life-threatening. Combining substances increases the risk of:

• Respiratory depression and overdose
• Unpredictable effects and loss of consciousness
• Increased toxicity to liver and other organs
• Impaired judgment leading to risky behaviors

Learn more about alcohol use disorder and polysubstance use.

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