Pain Uncontrolled on Current Analgesia
at the bedside
- vitals including RR and sedation score before adding any opioid
- check the chart: was analgesia actually given, dose, route
- can patient take PO: vomiting, NPO or ileus means oral route not working
- score pain at rest and on movement; reassess after every intervention
must not miss
- pain out of proportion to findings → ischemia, compartment syndrome, necrotizing infection
- post-op day ≥ 3 with fever and pain → abscess or dehiscence
- opioid toxicity: pinpoint pupils, sedation, RR < 8
- new severe pain in a different site → new diagnosis, not a dose problem
HPI & examination
history
- pain: site, radiation, character (sharp, dull, burning, cramping), onset, new vs worsening
- context: post-op, trauma, malignancy, chronic pain flare, sickle cell
- current analgesia: drug, dose, route, frequency, last dose, effect achieved
- background: opioid tolerance/dependence, renal/hepatic function, previous adverse reactions
examination
- the site: wound (infection, hematoma), abdomen (guarding, rigidity, rebound), limb (pulses, pallor, tense compartment)
- sedation and respiration: RR, pupils, rousability in anyone already on opioids
- perfusion: pain plus cold, pulseless or mottled limb = vascular emergency
- abdomen: distension, absent bowel sounds: may need to change route
workup
- before starting or escalating opioids: renal function and LFTs
- fever with pain: CBC, CRP, cultures
- chest or upper abdominal pain: ECG and troponin
- suspected complication: imaging directed at site (ultrasound or CT)
- no investigation should delay analgesia in severe distress
treat
treat the cause, not only the score
- uncontrolled pain despite adequate analgesia is a diagnostic finding: look for a new problem before escalating doses
- check the obvious: drug not given, wrong route, dose too small, interval too long
build multimodal analgesia
- base, regular not PRN: paracetamol 1 g PO/IV q6h (max 4 g/day; avoid severe liver disease, reduce if low body weight)
- add: ibuprofen 400–600 mg PO q6–8h if no renal impairment, GI bleed risk, or heart failure
- then: tramadol 50–100 mg PO/IV q6h (max 400 mg/day); caution: elderly, seizures, serotonergic drugs
- severe pain: morphine 2–5 mg IV q2–4h PRN, or 5–10 mg SC q4–6h, titrate to effect, monitor RR
- always: start regular laxative with regular opioid; treat nausea
- combination tablets contain paracetamol: count toward daily total
why not just climb the WHO ladder
- the 1986 WHO ladder was designed for cancer pain and adopted for acute pain without evidence
- acute inpatient pain = multimodal analgesia: scheduled non-opioid base; regional / local techniques where available; adjuvants matched to pain type; opioids as rescue, not the next rung
- PRN-only paracetamol is no base: fix the base before reaching for opioids
adjuncts, for neuropathic or spasm pain
| drug | dose | caution |
|---|---|---|
| gabapentin | 100–300 mg PO TID | reduce in renal impairment; sedation with opioids |
| pregabalin | 50 mg PO BID | avoid abrupt cessation; sedation with opioids |
| baclofen | 5–10 mg PO TID | CNS depression, especially elderly |
gabapentinoid plus opioid: respiratory depression
- gabapentin and pregabalin cause serious respiratory depression with opioids or other CNS depressants
- highest risk: age ≥ 65, COPD or other lung disease, renal impairment, concurrent benzodiazepines
- start low; monitor sedation and RR as with opioids
opioid toxicity: naloxone wears off before the opioid does
- RR < 8, pinpoint pupils, unrousable → stop opioid, oxygen, call for help
- naloxone: 0.1 mg IV increments, titrated to breathing (not to full reversal); 0.4 mg IV/IM if peri-arrest (two-pathway detail)
- naloxone lasts less than the opioid. Respiratory depression can recur: monitor well beyond the dose, longer after modified-release opioids, methadone, or fentanyl patch
- repeated doses needed → needs infusion and higher monitoring: escalate
opioids when the kidneys are poor
- Morphine and codeine accumulate in renal impairment: avoid if CrCl < ~30 mL/min
- M6G is renally cleared: sedation and respiratory depression build even when parent drug levels look low
- Safer alternatives: fentanyl, alfentanil; oxycodone or hydromorphone with dose reduction and close monitoring.
- Avoid modified-release and background infusions in unstable renal function.
- Conversions are protocol-dependent: ask pain or palliative team rather than converting from a table.
escalation
escalate
- now: pain out of proportion, suspected ischemia, compartment syndrome or necrotizing infection; opioid toxicity needing repeat naloxone
- senior: pain worsening despite proper multimodal regimen, or ongoing IV/SC opioid requirement
- pain or palliative team: opioid tolerance, renal impairment, complex or neuropathic pain, conversions
evidence
| source | type |
|---|---|
| FDA 2019 gabapentinoid + opioid warning | regulatory / safety update |
Verify indication, dose, allergies, interactions, renal/hepatic function and local protocols before prescribing.
go deeper the full MOC+ Acute Medicine set covers the on-call essentials.
free the on-call checklist covers the whole shift on one printable page.
studying for the IM exam? the IM Rapid Review covers analgesia and acute pain in the same format. see the sample chapter.
reviewed Jul 2026updated Sep 2026file complaint/pain-uncontrolled-on-current-analgesia