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Morphine

Morphine sulfate · MS Contin · Duramorph · Infumorph

A Schedule II full opioid agonist for appropriately selected severe pain. This profile distinguishes current selected immediate-release oral products, two extended-release capsule designs, MS Contin tablets, IV injections and specialist neuraxial formulations.

Therapeutic class
Full opioid agonist · Schedule II
Representative product
Hikma oral solution · 2 mg/mL
Reference focus
Product, concentration and route-specific dosing
Essential safety

Verify concentration, release design, route and opioid tolerance.

Morphine can cause fatal respiratory depression. Oral 20 mg/mL solution is only for opioid-tolerant adults. Extended-release products are not rescue doses; never crush their release systems. Duramorph and Infumorph have different neuraxial roles and require specialist monitoring. Call emergency services for suspected overdose, even after reversal treatment.

Warnings and precautions
01

Indications

The formulation determines the labeled pain setting and age group.

Immediate-release and extended-release uses

Selected IR oral and IV products manage pain severe enough to require an opioid when alternatives are inadequate. Hikma oral solution 2 and 4 mg/mL includes pediatric use at age two and older; section 8.4 establishes acute, not chronic, pediatric pain. Selected IR tablets establish acute pediatric use at body weight ≥50 kg. ER tablets and capsules address severe persistent pain requiring an opioid when alternatives, including IR opioids, are inadequate; they are not as-needed analgesics and have no established pediatric use below 18.

Neuraxial indications and scope

Duramorph permits IV analgesia and epidural/intrathecal pain management; it is not for continuous microinfusion devices. Infumorph is only for continuous epidural/intrathecal infusion of intractable chronic pain when less invasive methods are inadequate, not single-dose systemic or neuraxial injection. This profile gives selected current U.S. labels, not a universal morphine conversion tool. Other injection devices, IM/SC regimens, compounded preparations and morphine combinations require their own verified orders and labeling.

02

Dosage and administration

Initiate individually and reassess analgesia, sedation and breathing.

Immediate-release oral starting doses

Use the lowest effective dose and shortest duration consistent with treatment goals; prescribe the exact product. Pediatric chronic-pain regimens are not established by these selected IR labels.

Selected product and populationLabeled starting regimen
Hikma IR tablet · adults15–30 mg orally every 4 hours as needed.
Hikma IR tablet · pediatric ≥50 kg, able to swallow tablets15 mg every 4 hours as needed; initial dose must not exceed 30 mg. Below 50 kg these strengths cannot deliver the recommended dose.
Hikma solution · adults10–20 mg orally every 4 hours as needed. Use 2 or 4 mg/mL initially; 20 mg/mL only in opioid-tolerant adults already stabilized on lower concentrations.
Hikma solution · age ≥2, acute painOnly 2 or 4 mg/mL: 0.15–0.3 mg/kg orally every 4 hours as needed; initial dose must not exceed 20 mg. No established use below two or pediatric use of 20 mg/mL.

Solution measurement and tolerance

Write both mg and mL and the concentration. Use a metric graduated oral syringe; the 20 mg/mL product requires its enclosed syringe, never a household spoon. The selected pediatric label calculates weight-based mg, converts to mL, rounds volumes below 1 mL to the nearest 0.1 mL and above 1 mL to the nearest 0.2 mL, then recalculates final mg. Confirm the prescribed dose/volume with the pharmacist. Opioid tolerance means at least one week of ≥60 mg/day oral morphine or an explicitly labeled equianalgesic opioid regimen; a past occasional opioid dose is insufficient.

Extended-release schedules

Swallow ER tablets whole. Selected capsules may be opened onto applesauce and swallowed immediately without chewing their pellets; discard unused mixture. Do not substitute other foods. Actavis does not authorize tube delivery; Upsher-Smith describes a gastrostomy procedure and specifically prohibits nasogastric delivery. Use its complete instructions and matched clinical order.

Current selected ER designStarting schedule and restrictions
MS Contin · tabletsNon-tolerant starting dose 15 mg every 8–12 hours. Titrate individually; label permits adjustments every 1–2 days. A single dose >60 mg or daily total >120 mg requires established tolerance.
Actavis · once-daily capsulesNon-tolerant starting dose 30 mg every 24 hours; never more frequent. Titration may occur every 3–4 days. 90 and 120 mg capsules require established tolerance. Product-specific ceiling 1600 mg/day relates to fumaric-acid toxicity; it is not a safe target dose.
Upsher-Smith · once/twice-daily capsulesLabel advises initiating opioid-naive treatment with IR morphine before conversion. Non-tolerant capsule starting regimen is 30 mg every 24 hours; established dosing can be every 24 or 12 hours. Adjustments may occur every 1–2 days. 100 mg capsules, a single dose >60 mg or daily total >120 mg require tolerance.

Selected IV starting regimens

Hikma 1 mL IV syringes (2 or 4 mg/mL) and IV vials (4, 8 or 10 mg/mL): adult initial 0.1–0.2 mg/kg every 4 hours as needed, administered slowly. Duramorph IV adult initial range is 2–10 mg per 70 kg, individualized; its label does not assign the same every-four-hour schedule. Have resuscitation support and monitor response. The cited Hikma products specify IV administration, not IM, SC or neuraxial use.

Duramorph · specialist single-dose neuraxial use

Use only by an experienced clinician with verified catheter/needle placement and full resuscitation capability. Observe in a staffed, fully equipped setting for at least 24 hours because respiratory depression may be delayed. Neuraxial administration is generally limited to the lumbar region; repeated intrathecal injections are not recommended. Do not put Duramorph into a continuous microinfusion device.

Adult routeSelected labeled regimen
Lumbar epiduralInitial 5 mg. If inadequate after one hour, carefully assess incremental 1–2 mg doses at intervals sufficient to evaluate response. Maximum 10 mg per 24 hours.
IntrathecalSingle 0.2–1 mg; maximum volume 2 mL of 0.5 mg/mL or 1 mL of 1 mg/mL. If pain recurs, consider another route instead of repeating intrathecal injections.

Infumorph · continuous neuraxial infusion

Hospitalized assessment with lower-concentration Duramorph test doses precedes pump implantation. Observe at least 24 hours after each test dose and for several postoperative days as needed; reassess after reservoir manipulation/refill. Infumorph 10 or 25 mg/mL is too concentrated for single-dose neuraxial injection and must not be given as a single IV, IM or SC dose. These specialist initial ranges are individualized, not an outpatient pump-setting algorithm.

Continuous adult routeSelected labeled initial daily ranges
EpiduralWithout tolerance: 3.5–7.5 mg/day. With some tolerance: usual start 4.5–10 mg/day; subsequent requirements vary.
Lumbar intrathecalWithout tolerance: 0.2–1 mg/day. Published range with some tolerance: 1–10 mg/day. Individual upper limits; doses above 20 mg/day need particular caution for serious toxicity.

Conversion, titration and discontinuation

Oral, IV and neuraxial doses are not interchangeable milligram for milligram. Published equianalgesic ratios are approximations; no single conversion factor is appropriate for every patient or ER product. Assess prior opioid exposure, organ function and response, provide a supervised rescue plan, and reassess closely after conversion. Do not abruptly stop or rapidly reduce regular morphine in a physically dependent patient. Agree on an individualized taper with follow-up and pain/mental-health support; the oral labels explicitly reject one universal taper schedule.

03

Safety

Respiratory depression, overdose and dependence are central safety risks.

Warnings and precautions

Assess abuse/addiction risks and reassess throughout therapy. Monitor especially after initiation, dose changes, conversion and added sedatives. Risk rises with sleep-disordered breathing, pulmonary disease, older age, cachexia and debility. Avoid circulatory shock and impaired consciousness/coma; evaluate hypotension, increased intracranial pressure/head injury, adrenal insufficiency, worsening seizures, biliary/pancreatic symptoms and opioid-induced esophageal dysfunction. New pain worsened by dose increases may represent hyperalgesia rather than undertreatment. Neuraxial use adds delayed respiratory depression and urinary retention; continuous intrathecal infusion can cause catheter-tip inflammatory masses and neurologic injury. New weakness, sensory change or myoclonus needs urgent specialist evaluation.

Contraindications

Do not use with significant respiratory depression; acute/severe asthma without appropriate monitoring or resuscitative equipment; known/suspected GI obstruction including paralytic ileus; morphine hypersensitivity; or an MAOI currently or within the preceding 14 days. Selected neuraxial labels additionally prohibit use with injection-site infection, anticoagulant therapy, uncontrolled bleeding diathesis, or another condition making epidural/intrathecal administration especially hazardous. Route/concentration exclusions remain mandatory even if not listed as section 4 contraindications.

  • Duramorph and Infumorph neuraxial contraindications are product and route specific.

Boxed warning status

All selected morphine labels carry boxed warnings addressing addiction/abuse/misuse, life-threatening respiratory depression, dangerous opioid/CNS-depressant combinations and neonatal withdrawal with prolonged pregnancy exposure. Oral labels also address accidental ingestion and emphasize opioid REMS education; solution labeling highlights concentration and mg/mL errors. Duramorph and Infumorph highlight neuraxial respiratory-depression monitoring and specialized administration restrictions. Read the complete warning for the dispensed formulation. Selected Actavis and Upsher-Smith ER capsules additionally carry an alcohol-interaction boxed warning: alcohol can increase exposure and cause fatal overdose.

Adverse reactions

Nausea, vomiting, constipation, dizziness, sedation and sweating are common opioid effects; itching and urinary retention are particularly relevant to neuraxial use. Serious reactions include respiratory depression, severe hypotension, anaphylaxis and interaction-related serotonin syndrome. Chronic opioid exposure can affect endocrine function and fertility. Suspected overdose requires emergency services, airway/ventilatory support and an opioid reversal agent; recurrent depression can outlast reversal, especially with ER or neuraxial delivery, so apparent initial recovery does not end observation.

04

Drug interactions

Review both pharmacodynamic and exposure-related interactions.

Interactions requiring action

Check prescription drugs, OTC products, alcohol and supplements before initiation or dose changes.

Co-treatmentClinical action
Benzodiazepines, alcohol and other CNS depressantsReserve combinations for inadequate alternatives; minimize doses/duration, monitor breathing and sedation, and plan overdose reversal access. Gabapentinoids and other opioids also matter. Selected Actavis and Upsher-Smith ER capsules also have an alcohol-related exposure/overdose boxed warning.
MAOIs, including linezolidContraindicated during treatment and within 14 days after stopping an MAOI.
Other serotonergic medicinesMonitor especially at initiation/titration; stop morphine and obtain urgent assessment if serotonin syndrome is suspected.
Mixed or partial opioid agonistsMay reduce analgesia or precipitate withdrawal. Avoid unsupervised co-use; any planned transition requires a clinician protocol.
Muscle relaxantsEnhanced neuromuscular blockade and respiratory depression; supervised dose reduction may be needed.
Cimetidine or P-gp inhibitorsMay increase opioid effects/exposure; monitor and adjust individually. The solution label lists quinidine and verapamil as P-gp examples.
AnticholinergicsMore urinary retention, constipation and ileus risk; monitor bowel/bladder function.
DiureticsReduced diuretic efficacy can occur; assess diuresis and BP before changing treatment.

Neuraxial co-treatment

Additional systemic opioids/sedatives may produce dangerous additive respiratory effects. Neuraxial anticoagulant restrictions are explicit in the selected labels; bleeding-risk decisions require the procedural team. Do not interpret specialist monitoring as permission for a contraindicated neuraxial combination.

05

Use in specific populations

Pediatric approval and lactation advice differ by formulation.

Pediatric populations

Hikma 2 and 4 mg/mL oral solution establishes acute-pain use at age 2–17; pediatric chronic pain and use below two are not established. Selected IR tablets establish acute use in pediatric patients ≥50 kg who can swallow tablets, not all age groups or chronic pain. Selected ER products and Hikma IV injections do not establish safety/effectiveness below 18. Duramorph/Infumorph labels do not recommend pediatric spinal use because adequate studies are lacking.

Pregnancy and lactation

Prolonged pregnancy exposure can cause life-threatening neonatal opioid withdrawal; arrange neonatal expertise. Human data do not establish a clear major-malformation association, but animal developmental risks and neonatal respiratory depression warrant individualized assessment. Selected ER labels advise against breastfeeding. Selected oral-solution and neuraxial labels instead describe a maternal-need/infant-risk assessment; observe exposed infants for excess sleepiness, limpness and impaired breathing, and seek emergency care for these signs. Infant withdrawal can occur when maternal opioid exposure or breastfeeding stops.

Older adults and organ impairment

Older, frail or debilitated patients need cautious low-dose initiation and slow titration. Renal failure reduces clearance and permits M3G/M6G accumulation; cirrhosis alters clearance. Selected systemic labels advise lower-than-usual starting doses, slow titration and repeated assessment of sedation, breathing and BP, rather than a universal eGFR adjustment table. Neuraxial labels warn that high systemic levels with hepatic/renal dysfunction can take days to develop; ongoing monitoring remains necessary.

06

Clinical pharmacology

Analgesia and respiratory effects arise from opioid-receptor activity.

Mechanism and pharmacodynamics

Morphine is a full opioid agonist, relatively selective for mu receptors. Analgesia accompanies dose-dependent respiratory/CNS depression, reduced GI propulsion and peripheral vasodilation. Analgesic response has no fixed pharmacologic ceiling, but adverse effects constrain dosing; this does not remove formulation-specific restrictions or the Actavis fumaric-acid ceiling. Endocrine changes and physical dependence may develop with sustained exposure.

Disposition and release design

Oral bioavailability is limited and variable because of presystemic metabolism. Hepatic glucuronidation forms M3G and analgesically active M6G, predominantly cleared in urine. MS Contin’s label describes oral bioavailability around 20–40% and an effective post-IV half-life of 2–4 hours; longer terminal estimates depend on sampling. ER absorption and neuraxial delivery prolong clinical exposure and are not represented by that systemic elimination number. Different ER capsules are not automatically bioequivalent to other ER designs.

07

Monitoring and counseling

Reassess pain, function and harms throughout treatment.

Monitoring priorities

Assess pain/function goals, prior opioid exposure, sedation, respiratory status, BP, bowel/bladder function and misuse risk. Reassess after starts, titrations, conversions and interacting-drug changes; periodically consider renal/hepatic function and ongoing need. Evaluate new hyperalgesia, dysphagia, adrenal symptoms, seizures or sleep-related breathing problems. Neuraxial care additionally requires site/device checks, delayed respiratory observation, pump refill planning and monitoring for new neurologic deficits.

Counseling and emergency plan

Confirm the exact concentration and schedule at every refill. Never share morphine, alter ER release systems, add alcohol/sedatives without review, or change/stop regular dosing independently. Avoid driving until individual effects are known. Arrange access to an appropriate overdose reversal agent, teach caregivers its instructions, and call emergency services for unresponsiveness or slow/abnormal breathing even after it is used. Discuss constipation and secure storage away from children. Prefer take-back disposal; follow the exact label/FDA disposal instructions when take-back is unavailable.

Infumorph preparation and pump safeguards

Only trained personnel may fill the correct device port using strict asepsis and the device maker’s directions. Filter ampul contents through a 5-micron or smaller microfilter; if dilution is needed, the label recommends 0.9% Sodium Chloride Injection. A pocket fill or wrong-port injection can deliver a major overdose. Avoid an empty reservoir, which can cause severe pain/withdrawal and device complications. Teach patient/caregiver device and site care before discharge; this summary does not replace the full device refill procedure.

08

Product identification

Read sulfate strength, route and release design on the actual package.

Representative product

Hikma oral solution 2 mg/mL is a clear blue-green solution; selected 100 mL bottle NDC 0054-0237-49. The selected 15 mg IR tablet is white, scored and marked 54 over 733. Package identities are examples, not stock evidence or an instruction to select medicine by color.

Dosage forms and strengths

Selected labeled doses are morphine sulfate strengths; do not recalculate prescriptions as free-base morphine. Different release schedules and route restrictions remain in effect. Current MS Contin selected strengths are 15, 30 and 60 mg; do not present its discontinued 100/200 mg brand products as current. Other generic tablet strengths require their own label.

Selected formulationConcentration or strengths
IR oralHikma tablets 15 and 30 mg; solutions 2, 4 and 20 mg/mL.
ER capsulesActavis once daily: 30, 45, 60, 75, 90 and 120 mg. Upsher-Smith once/twice daily: 10, 20, 30, 50, 60, 80 and 100 mg.
Selected IV productsHikma syringes: 2 or 4 mg in 1 mL. Hikma vials: 4, 8 or 10 mg in 1 mL. These selected packages specify IV only.
DuramorphPreservative-free 0.5 or 1 mg/mL in 10 mL single-use ampuls; IV and selected single-dose neuraxial use.
InfumorphPreservative-free 10 or 25 mg/mL in 20 mL single-use ampuls; continuous neuraxial infusion only.

Storage and handling

Hikma IR oral products and selected injections specify 20–25°C. MS Contin and Actavis ER capsules specify 25°C with 15–30°C excursions; Upsher-Smith specifies 20–25°C with those excursions. Protect oral products from moisture and follow product-specific light-resistant packaging. Selected injections require light protection, no freezing, no heat sterilization and disposal of unused single-dose contents. Keep Duramorph/Infumorph ampuls in their cartons until use. Inspect solutions as directed; do not use inappropriate discoloration or particles. Store securely and dispose of unused medicine according to the exact label.

09

References

Original sources for the clinical and product information.

  1. DailyMed / National Library of MedicineHikma · immediate-release oral tablets

    Full public manufacturer label and patient instructions; SPL version 13, effective 20260203. Product-specific directions reviewed October 1, 2026.

  2. DailyMed / National Library of MedicineHikma · oral solution 2, 4 and 20 mg/mL

    Full public manufacturer label and patient instructions; SPL version 4, effective 20260203. Product-specific directions reviewed October 1, 2026.

  3. DailyMed / National Library of MedicineMS Contin · extended-release tablets

    Full public manufacturer label and patient instructions; SPL version 18, effective 20260814. Product-specific directions reviewed October 1, 2026.

  4. DailyMed / National Library of MedicineActavis · once-daily extended-release capsules

    Full public manufacturer label and patient instructions; SPL version 47, effective 20260301. Product-specific directions reviewed October 1, 2026.

  5. DailyMed / National Library of MedicineUpsher-Smith · once/twice-daily extended-release capsules

    Full public manufacturer label and patient instructions; SPL version 21, effective 20250709. Product-specific directions reviewed October 1, 2026.

  6. DailyMed / National Library of MedicineHikma · IV prefilled syringes

    Full public manufacturer label and patient instructions; SPL version 7, effective 20260821. Product-specific directions reviewed October 1, 2026.

  7. DailyMed / National Library of MedicineHikma · IV single-dose vials

    Full public manufacturer label and patient instructions; SPL version 13, effective 20260712. Product-specific directions reviewed October 1, 2026.

  8. DailyMed / National Library of MedicineDuramorph · IV and single-dose neuraxial injection

    Full public manufacturer label and patient instructions; SPL version 11, effective 20251231. Product-specific directions reviewed October 1, 2026.

  9. DailyMed / National Library of MedicineInfumorph · continuous neuraxial infusion

    Full public manufacturer label and patient instructions; SPL version 12, effective 20251231. Product-specific directions reviewed October 1, 2026.

  10. U.S. Food and Drug AdministrationFDA · MS Contin current product status

    Official current Drugs@FDA product array checked October 1, 2026: 15/30/60 mg Prescription; 100/200 mg Discontinued. Status is not stock availability or substitute clinical directions.

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