Morphine
Morphine sulfate
Brand names:MS Contin, Roxanol, Duramorph, Astramorph
A naturally occurring opioid analgesic and the reference standard for opioid potency. Morphine has largely been displaced in TCCC doctrine by fentanyl (faster onset, shorter duration) and ketamine (no respiratory depression), but remains in civilian EMS use for moderate to severe pain and in select cardiac protocols.
Pharmacology and Actions
Morphine is a mu-opioid receptor agonist that produces analgesia, sedation, euphoria, and respiratory depression. It also causes histamine release from mast cells, which can produce vasodilation, hypotension, and pruritus. The histamine release distinguishes morphine from fentanyl (which causes minimal histamine release). The drug crosses the blood-brain barrier slowly relative to fentanyl, producing a slower onset and longer duration.
Indications
- Moderate to severe pain in trauma, burns, and ischemic conditions
- Cardiogenic pulmonary edema (historically; current ACS guidelines have reduced use)
- Severe pain in casualties when ketamine and fentanyl are unavailable
- Palliative pain management in prolonged field care or end-of-life situations
Absolute Contraindications
- Known morphine or opioid allergy
- Respiratory depression or inadequate ventilation
- Severe hemodynamic instability or hypotension
- Active asthma exacerbation (histamine release worsens bronchospasm)
- Suspected head injury with elevated ICP (relative)
- Concurrent MAOI use within 14 days
- Severe hepatic impairment
Precautions and Side Effects
Respiratory depression is the primary safety concern. Hypotension is more common with morphine than fentanyl due to histamine release; this is particularly relevant in trauma patients who may already be hypovolemic. Nausea, vomiting, constipation, and pruritus are common. The histamine release can trigger or worsen bronchospasm in asthmatic patients. Naloxone reverses respiratory depression but has a shorter duration than morphine, requiring monitoring for re-narcotization. Use cautiously in elderly patients and those with hepatic or renal impairment.
Adult Dosing
Pediatric Dosing
Pediatric dosing: 0.1 mg/kg IV/IM, maximum 4 mg per dose for moderate to severe pain. Pediatric opioid use requires Medical Command order in most PA EMS protocols. Consult local standing orders.
Pharmacokinetics
Peak Effect: IV: 20 minutes. IM: 30 to 60 minutes. PO: 1 hour.
Duration: IV/IM: 3 to 5 hours. PO: 4 to 6 hours.
Storage and Handling
Store at controlled room temperature (15 to 30 degrees Celsius). Protect from light. Schedule II requires DEA-compliant secure storage and chain-of-custody documentation. Discoloration (darkening) indicates degradation; do not administer.
Reconstitution:
Morphine is supplied as a sterile solution in concentrations of 1 mg/mL, 2 mg/mL, 4 mg/mL, 5 mg/mL, and higher. No reconstitution required.
TCCC and TECC Role
Morphine is no longer a primary TCCC analgesic. The 2026 guidelines emphasize ketamine for non-mission-capable casualties and fentanyl when an opioid is required. Morphine's histamine release, slower onset, and longer duration are operationally inferior to fentanyl in tactical environments. The drug remains in civilian EMS use, particularly for cardiac and palliative indications, but TCCC doctrine has moved away from it as a primary analgesic. In a TEMS context, morphine may still be carried as a backup analgesic where civilian EMS standing orders include it.
Morphine is the opioid most civilian medics learned first and the one most have removed from their primary trauma analgesic position over the past decade. The drug works, but the hypotension and histamine effects make it operationally inferior to fentanyl in trauma. Where morphine still has a real role is non-trauma pain in stable patients (kidney stones, sickle cell crisis, palliative care) and in cardiac protocols where its sedative and venodilator effects are clinically useful. The 3 to 5 hour duration matters: a single dose carries the patient through a long transport, which is why morphine retains a niche in prolonged care.
Using morphine in a trauma patient who is already hypotensive. The histamine-mediated vasodilation can drop blood pressure further and worsen shock. Fentanyl is hemodynamically more stable; ketamine actively supports blood pressure. Reserve morphine for hemodynamically stable patients or use a different analgesic when shock is a concern.
This drug profile is provided as educational reference material for trained medical providers. It is not medical advice, not a substitute for formal training, and not a substitute for current published guidelines or medical direction.
Drug administration is governed by your scope of practice, agency standing orders, medical director protocols, and applicable state and federal regulations. Controlled substances are subject to additional handling, accountability, and documentation requirements per DEA and state law. Always verify dosing, indications, contraindications, and route of administration against current published guidelines and your local protocols before administration.
If this content is being viewed during a medical emergency, call 911 immediately and follow the direction of your local emergency dispatch and medical control. Do not use this reference as a substitute for emergency medical services.
Drug information evolves. Last reviewed dates and source citations are provided for each entry. Confirm currency against the cited source before clinical use.
Penn Tactical Solutions publishes this reference for educational purposes. PTS does not provide medical direction and does not assume responsibility for clinical decisions made in the field. Clinical responsibility rests with the administering provider, their medical director, and their agency.
Educational reference for trained medical providers. Not medical advice. Not a substitute for formal training, current published guidelines, or medical direction. Drug administration is governed by your scope of practice, agency standing orders, medical director protocols, and applicable state and federal regulations. Controlled substances require additional storage, accountability, and documentation per DEA and state law.
In a medical emergency, call 911. This reference is not a substitute for emergency medical services.
Verify dosing, indications, and contraindications against current published guidelines and your local protocols before administration. Confirm content currency against the source citation. Penn Tactical Solutions does not provide medical direction. Clinical responsibility rests with the administering provider, their medical director, and their agency.
Morphine
Schedule II| IV/IO | EMS: 2 to 4 mg IV slow push, titrated to effect. May repeat every 5 to 10 minutes as needed. Total dose typically not to exceed 10 to 20 mg without medical command consultation. Pediatric dosing 0.1 mg/kg IV, maximum 4 mg per dose. (5 to 10 minutes) |
| IM | 5 to 10 mg IM, single dose. Onset is slower than IV (10 to 20 minutes); IV is preferred when access is available. (10 to 30 minutes) |
| IN | Not a standard route for morphine due to poor intranasal bioavailability. Fentanyl is the preferred IN opioid. |
| PO | Immediate-release morphine: 15 to 30 mg PO every 4 hours as needed. Not commonly used in prehospital settings. (30 to 60 minutes) |