Opioid Analgesics

Morphine is deliberately not routine: IV morphine only for severe ischemic pain unresponsive to nitrates, and only with adequate blood pressure. Pain relief does reduce sympathetic drive — but the old “M for everyone” MONA reflex is gone, and RV infarction is another reason to hold it.

Post-operative pain and some phantom pain — with caution. "Opioid and nonopioid medications are prescribed to help manage postoperative pain." For phantom pain, opioids "should be used in conjunction with antidepressants or neural modulating agents (i.e., gabapentin, pregabalin)," and "their use in a condition of benign pain should be done with caution in order to avoid potential effects from tolerance and dependence."

Dyspnea, pain and end-of-life breathlessness. "In addition to NIV, relaxation techniques, psychosocial support, morphine, and benzodiazepines are helpful" for dyspnea and anxiety; "when these fail, opioids become the mainstay of pain treatment."

Pain control is part of the hemodynamic plan (ACC/AHA Class 1): pain drives heart rate and pressure up, so IV opiates — morphine in the StatPearls sequence — relieve pain and lower sympathetic tone at the same time, helping reach the HR and SBP targets. The substitution to refuse is IV ketorolac, which "may not be suitable because of the risk of inducing hypertension as well as adverse renal effects." After repair, multimodal analgesia (epidural for open repair) lets the patient cough, deep-breathe, and walk.

[Trigeminal neuralgia] Not usually helpful — "opioid medications such as hydrocodone are not usually helpful in treating TN."

Envenomation pain. Pit viper: "clinicians should avoid NSAIDs due to the potential to worsen coagulopathy and platelet aggregation." "Because of this theoretical risk, opioid analgesics are the recommended agents for adequate pain control" (StatPearls, citing the Wilderness Medical Society). Black widow, moderate–severe: "the use of opioids for pain management and benzodiazepines for muscle spasm control, as needed. Caution is necessary when co-administering opioids and benzodiazepines" — "Prescribing agents from both classes at discharge is not recommended" (StatPearls).

Post-mastectomy pain — "Multimodal analgesia is recommended to minimize opioid use."

Severe burns require IV pain medication — the contrast is depth-driven: superficial burns need only OTC or topical analgesia, while deeper burns hurt wherever nerve endings survive. Burns are a classic indication for IV opioid PCA (morphine is the gold-standard agent): only the patient presses the button, with sedation and respiratory checks every 1–2 h for the first 24–48 h. Dressing changes and pseudoeschar debridement are painful, so pain must be well controlled around wound care.

Used here only at the level this page can source: pain control is a core goal of palliative care, available from diagnosis onward rather than at the end. Palliative care is "care meant to IMPROVE THE QUALITY OF LIFE of patients who have a serious or life-threatening disease, such as cancer," and "IT CAN BE GIVEN WITH OR WITHOUT CURATIVE CARE," with the goal "to PREVENT OR TREAT, AS EARLY AS POSSIBLE, the symptoms and side effects of the disease and its treatment." The sourced examples of palliative intervention for pain are procedural rather than pharmacological — "doctors may give CHEMOTHERAPY OR RADIATION THERAPY TO SLOW THE GROWTH OF A TUMOR THAT IS CAUSING PAIN," or "SURGERY may be performed to remove a mass that is pressing on certain nerves and causing pain." Opioid selection, the analgesic ladder and equianalgesic conversion are owned by the class page, not by this one.

For severe pain in acute cholecystitis or biliary pancreatitis, opioids and NSAIDs are used together — and no agent is preferred. The exam trap: the old rule that morphine is contraindicated because it spasms the sphincter of Oddi, so "give meperidine instead," is obsolete. Opioids as a class do contract the sphincter (which is exactly why they are held ≥ 6 hours before a HIDA scan), but meperidine’s biliary-spasm risk is now known to equal other opioids, and it was dropped from the WHO essential-medicines list in 2003 (normeperidine seizures, serotonin syndrome, MAOI interaction) — it is not recommended for routine analgesia. After surgery, opioids constipate: encourage fluids, activity, and the ordered stool softener.

Not recommended. "In general, clinicians should avoid prescribing opioids for fibromyalgia treatment"; NSAIDs, acetaminophen and opioids "are generally not recommended due to their limited effectiveness and potential risks" (StatPearls). StatPearls notes only that tramadol may help some patients with refractory symptoms. Pregabalin plus an opioid risks respiratory depression.

Severe fracture pain requires oral or IV analgesia — and "achieving adequate pain control can be challenging," which is why splinting and traction (which themselves significantly reduce pain) and, in hip fracture, a preoperative fascia-iliaca nerve block to cut analgesia requirements all share the load. The exam point runs the other way: pain not relieved by the prescribed analgesic is a compartment-syndrome cue, not a dosing problem — re-medicating it hides the emergency. In elders, pair every analgesic decision with delirium monitoring (13.5–33% after hip fracture).

An adjunct for the pain that is common in GBS and can precede the weakness — reliable analgesia, but with two disorder-specific costs. Sedation blurs the serial neuro and respiratory assessment that the whole admission depends on, and ileus lands on a gut already dysmotile from dysautonomia (ileus management explicitly includes reducing opioids). Gabapentin or carbamazepine lower pain scores and cut opioid requirements, which is why they are the usual first move for the neuropathic component; constipation is measured and expected.

Mucositis pain. Patients "report debilitating pain"; management rests on "basic oral care, dietary advice, and pain control" (StatPearls, citing MASCC/ISOO). The budgeted sources name no specific analgesic — role only.

"selected opioid analgesics such as codeine may be used for acute bleeding-related pain" (StatPearls, hemophilia B).

Avoid or question — a precipitant. Opioids are on the StatPearls trigger list with benzodiazepines, and the KASL table directs stopping the opioid (naloxone listed). Drugs "may remain in the body for extended periods due to the liver's impaired ability to metabolize them" (StatPearls).

Pain of frostbite rewarming. Yellow Book: "Offer analgesics because rewarming may be intensely painful." StatPearls: "Nonsteroidal anti-inflammatory drugs additionally provide pain control, but stronger analgesics, including opioids, may be necessary." StatPearls, citing the 2024 WMS guideline, advises starting ibuprofen "as soon as possible to inhibit prostaglandin- and thromboxane-mediated vasoconstriction." Trench foot: the Yellow Book lists pain relief with "narcotics if severe pain".

The second-line and rescue role, not the opening move — which inverts what many patients and some clinicians expect for pain this severe. Morphine sulfate 0.1 mg/kg IV or IM or hydromorphone 0.02 mg/kg IV or IM "can be effective for analgesia, particularly when other treatments, such as ketorolac, have failed." The stated reason for the ordering is that opioids carry "unfavourable side effect profiles and have the potential for tolerance and misuse" while delivering no better analgesia than an NSAID in this specific pain. Practically, that means an opioid request in renal colic is a prompt to check whether an adequate NSAID has actually been given first.

A last resort, for the shortest time. ACP: "Clinicians should only consider opioids as an option in patients who have failed the aforementioned treatments and only if the potential benefits outweigh the risks." For disc herniation, "they should be prescribed for the shortest duration possible." Tramadol is second-line for chronic pain. Physical therapy helps patients reduce or discontinue opioid use.

Dyspnea and cough in cancer. NCI: "Opioids are an extremely effective treatment for dyspnea in cancer patients, and fear of side effects should not prevent their appropriate use"; used appropriately, "opioids do not hasten death in dyspneic cancer patients." Start "at a regular low dose in opioid-naïve patients, followed by appropriate dose titration." "Cough-suppressing agents such as opioids are commonly used." After lobectomy, epidural or paravertebral blocks "are preferred over systemic opioids to preserve respiratory function."

Avoid for headache — opiates increase ED visits, reduce the effect of other drugs, carry a high addiction burden, and are the leading cause of medication-overuse headache.

Caution — avoid where possible and monitor closely. StatPearls lists opiates among the drugs that "may exacerbate their condition." With PCA, sleep apnea raises the risk of "decreased level of consciousness, respiratory distress, and hypotension"; continuous pulse oximetry, end-tidal CO2 monitoring and frequent vital signs "may be required," especially at initiation.

The guideline splits this class rather than treating it as one, and reproducing the split correctly is the whole point. Tramadol is conditionally recommended for hand, knee and hip. Non-tramadol opioids are conditionally recommended against for the same three sites. A page that says "opioids should be avoided in osteoarthritis" misreports the guideline in one direction; a page that says "opioids are reasonable for osteoarthritis pain" misreports it in the other. The accurate statement is that ACR reached two different conclusions about two different things, and both are conditional, which means the recommendation is sensitive to patient values and circumstances rather than settled. Note also that duloxetine is conditionally recommended for all three sites, so the non-opioid options for a patient who has exhausted NSAIDs are broader than they first appear. One boundary is important: the guideline addresses osteoarthritis management, not perioperative analgesia. No fetched source in this wave gives a post-arthroplasty opioid regimen, so this page states none — the 2023 perioperative guideline that would cover it was identified but not obtained. Opioid pharmacology, equianalgesic conversion, tolerance and the respiratory-depression profile belong to the class page.

For moderate to severe pain. Morphine has no ceiling effect — more analgesia, but also more sedation and respiratory depression. Monitor sedation and respiratory status before each dose; PCA is safe only because the patient must be alert enough to press the button, so no one else presses it. Start a bowel program with the first dose. CDC 2022 (adult outpatients): nonopioid therapies are at least as effective for many common acute pains and preferred for subacute and chronic pain; when opioids are used, prescribe the lowest effective dose of immediate-release opioids for no longer than needed, and offer naloxone.

Cancer pain. "Pain management is extremely important. Pancreatic cancer is one of the most painful malignancies. Opioids, antiepileptics, and corticosteroids all are effective for pain relief." When medicine is not enough, "Celiac axis and intrapleural nerve blocks can provide highly effective and long-lasting control of pain for some patients." After a Whipple, epidural or intrathecal analgesia, nerve blocks and nonopioid agents are "essential" adjuncts.

Acute pancreatitis pain is severe, and most patients need IV opioids — hydromorphone and fentanyl are preferred, with NSAIDs/acetaminophen as opioid-sparing partners. Here lives a classic NCLEX reversal: meperidine (Demerol) is now AVOIDED — neurotoxicity risk — and the old “morphine spasms the sphincter of Oddi” fear should not delay opioids (2026 European guideline: safety concerns should not delay timely opioids). PCA: use with caution, not as a default.

Low-dose morphine is used for chronic (long-term) breathlessness — with a risk of addiction (NHLBI).

Caution in endometriosis pain. "Evidence supporting chronic opioid therapy for pelvic pain is limited, and potential harms, eg, immune suppression, hormonal disturbances, and increased pain sensitivity, likely outweigh the benefits"; long-term dependence risk is substantially increased.

Prescribed here to break the pain → splinting → hypoventilation → atelectasis → pneumonia cascade in rib fractures, flail chest, and chest-tube patients: pain control is essential to prevent hypoventilation-related complications, and excellent analgesia is a cornerstone of chest-wall injury care alongside pulmonary hygiene and early mobility. Opioids were historically first-line but are now the second line within multimodal analgesia — multimodal regimens decrease opioid requirements and improve pulmonary outcomes, a Level 1 trauma-center protocol of scheduled acetaminophen, ibuprofen, gabapentin, methocarbamol, and/or topical lidocaine with short-acting opioids held in reserve cut opioid use without more ventilation or longer stays, and regional techniques (epidural, paravertebral, intercostal, serratus anterior plane blocks) are preferred over opioids alone in flail chest. The trade-off is the whole nursing problem: opioids cause sedation, respiratory and cough suppression, and delirium — so the dose is titrated to a patient who can deep-breathe and cough, not to sedation, with extra caution in older trauma patients who need aggressive pulmonary hygiene. Premedicate 30 minutes before chest-tube removal.

Last line for chronic kidney pain. KDIGO puts nonpharmacologic measures and acetaminophen first; "Opioid use should be limited" to people who do not respond to earlier steps.

On this page opioids appear as a cause — the leading reversible route to hypercapnic pump failure through medullary μ-receptor depression — and the reversal logic follows the physiology. Naloxone, a pure competitive μ-antagonist, is indicated "specifically to reverse respiratory depression from opioid use," but sequence matters: support ventilation with bag-valve-mask on 100% oxygen first, then give naloxone, in small titrated doses for a patient on therapeutic post-op opioids (to restore drive without precipitating withdrawal and its vomiting/aspiration risk). Reversal restores drive but does not remove the opioid: naloxone lasts roughly 90–180 minutes while methadone, fentanyl, buprenorphine, and others outlast it, so the patient is monitored continuously for re-sedation for at least 6–12 hours. Benzodiazepines and alcohol worsen the same failure and have no such rescue on this page.

First-line for moderate-to-severe vaso-occlusive pain — ischemic pain NSAIDs alone cannot touch. ASH 2020: analgesia within 1 hour of ED arrival, reassessed every 30–60 minutes; IV route preferred, weight-based morphine escalated in 25% increments, PCA preferred for persistent pain, and dosing individualized to the patient’s prior effective doses — undertreatment is the failure mode these rules exist to prevent, so believe the pain score. The one class member to avoid: meperidine — its metabolite normeperidine accumulates (especially with sickle nephropathy) and raises seizure risk. A short NSAID course (5–7 days) rides alongside per ASH.

Headache — after acetaminophen, with a sedation watch. Acetaminophen is first-line; "NSAIDs like aspirin should be avoided until the aneurysm is secured." Opioids "may provide pain relief as well as a degree of sedation and serve to decrease anxiety," but "Patients response to pain medications must be monitored closely to avoid oversedation and an inability to accurately assess the patients’ neurological status." No doses here — see the class page.

This class is on the page as the mechanism of harm, and as the thing being reversed. The disorder-side teaching is the chain: mu-receptor agonism produces analgesia and euphoria, but also tolerance, physical dependence, withdrawal on cessation, and the dose-dependent respiratory depression that is the actual mechanism of death. The numbers that make it a prescribing problem rather than only a street problem: up to 50% of patients on chronic opioid therapy meet the criteria for opioid use disorder, and in the United States, opioids have killed more people than any other drug in history. The prescribing lever, per CDC 2022 guidance as reported by StatPearls: exercise caution before escalating beyond 50 morphine milligram equivalents per day, because higher doses "typically fail to significantly enhance pain relief for most patients while simultaneously increasing the risk of overdose" — and at that threshold, provide naloxone and overdose prevention education to the patient and their household members, with more frequent follow-up. The modern context is contamination: there are "two types of fentanyl — pharmaceutical fentanyl prescribed for severe pain, and illicitly manufactured fentanyl," and "most recent cases of fentanyl-related overdose are associated with illicitly manufactured fentanyl that is added to other street drugs that make them more powerful, more addictive, and more dangerous." Carfentanil is the one potency figure this page can source: "approximately 10,000 times more potent than morphine and 100 times more potent than fentanyl… a miniscule amount of powder containing two milligrams can be lethal," and it "can be accidentally absorbed through the skin or inhaled by unsuspecting parties," so first responders must follow safety protocols. The class page owns equianalgesic dosing, individual agents and adverse-effect profiles. What this page adds is why the legitimate analgesic becomes the disorder, and the one non-opioid alternative the source names — "nonopioid drugs and physical therapy can provide a long-term solution to pain management instead of relying on the use of opioids."

Potentiate GABA for anxiety, seizures, and sedation. Additive CNS depression — deadly with opioids.

First-line antidepressants that raise synaptic serotonin. Delayed onset; watch for serotonin syndrome and early suicidality.

Stabilize neuronal firing to prevent seizures. Many are narrow-therapeutic-index — level monitoring and rash vigilance are essential.

A widely used fever/pain reliever with no anti-inflammatory or platelet effect — but hepatotoxic in overdose.

Dopamine-blocking drugs for psychosis. Watch EPS, NMS, metabolic effects — boxed warning in elderly dementia.

Lithium controls bipolar mania but has a tiny therapeutic window — levels are everything.