ICU Map
ICU Medication MasterclassHE • HRS-AKI • Variceal bleeding • ALF • Lactulose • Rifaximin • Terlipressin

Hepatology & GI ICU Pharmacology

A cirrhosis/hepatology medication curriculum that separates encephalopathy treatment, portal-pressure control, HRS-AKI vasoconstriction and acute liver-failure antidotal therapy. It emphasizes precipitant/source control and avoids drug-only treatment of syndromes driven by bleeding, infection or hemodynamic failure.

← Medication Library
1

Use lactulose clinically and avoid over-catharsis/electrolyte injury.

2

Know when rifaximin is adjunctive rather than first-line monotherapy.

3

Select terlipressin safely for HRS-AKI and recognize the 2026 respiratory-failure warning.

4

Start portal-pressure vasoactive therapy early in suspected variceal hemorrhage while arranging antibiotics/endoscopy.

5

Use N-acetylcysteine appropriately in acetaminophen toxicity and selected acute liver-failure contexts.

Decompensated Cirrhosis & ACLF

Integrated cirrhosis, HE, HRS, infection and bleeding management.

Open →
Core agents

Choose by physiology, not by habit

The table below is a selection framework. Open the individual monograph for exact dosing, preparation, renal/CRRT/IHD adjustment, interactions and evidence traceability.

Lactulose
Nonabsorbable Disaccharide / Ammonia-Lowering Laxative
Core agent

ICU role: First-line overt hepatic-encephalopathy pharmacotherapy.

Choose: Treat overt HE while correcting infection, GI bleeding, constipation, sedative/electrolyte precipitants.
Hesitate: Excessive diarrhea causes dehydration, hypernatremia and hypokalemia and can worsen HE/AKI.

Monitor: Mental status, stool number/consistency, Na/K, volume/renal function.

Rifaximin
Poorly Absorbed Rifamycin Antibacterial / Gut-Directed Ammonia-Lowering Therapy
Core agent

ICU role: Gut-directed add-on therapy for recurrent/persistent HE.

Choose: Add to lactulose for recurrent overt HE; useful for long-term recurrence reduction.
Hesitate: Does not replace precipitant treatment or acute lactulose-based therapy in most cases.

Monitor: HE recurrence, tolerance and adherence.

Terlipressin
Vasopressin Receptor Agonist / Splanchnic Vasoconstrictor
Core agent

ICU role: Disease-specific vasopressin-agonist therapy for selected HRS-AKI.

Choose: Use when HRS-AKI criteria/clinical context fit and oxygenation/ischemic risk allow.
Hesitate: Serious/fatal respiratory failure; do not initiate with hypoxia and avoid ongoing coronary/peripheral/mesenteric ischemia.

Monitor: Continuous SpO2, volume status, SCr response, ischemia.

Octreotide
Synthetic Somatostatin Analog / Splanchnic Vasoconstrictor
Core agent

ICU role: Splanchnic vasoactive therapy for suspected acute variceal hemorrhage where used by local protocol.

Choose: Start promptly in suspected portal hypertensive bleeding before definitive endoscopy.
Hesitate: Not definitive hemostasis and not routine therapy for nonvariceal upper-GI bleeding.

Monitor: Bleeding trajectory, HR/glucose and endoscopic plan.

N-Acetylcysteine
Glutathione precursor / antidote
Core agent

ICU role: Specific antidote for acetaminophen toxicity and selected ALF adjunctive therapy.

Choose: Start promptly when acetaminophen toxicity is suspected/indicated; delayed treatment can still be beneficial.
Hesitate: Do not use the acute nomogram for repeated supratherapeutic or uncertain chronic exposures.

Monitor: AST/ALT, INR, acetaminophen level, acid-base/mental status.

Ceftriaxone
3rd-Generation Cephalosporin Antibiotic
Core agent

ICU role: Common antibacterial prophylaxis/treatment component in acute variceal bleeding in advanced cirrhosis and for selected infections.

Choose: Short-course antibacterial prophylaxis during acute variceal hemorrhage where guideline/local resistance profile supports it.
Hesitate: Not a substitute for diagnostic cultures/source control or a universal long-term prophylaxis drug.

Monitor: Infection, allergy, biliary effects and culture data.

Vitamin K (IV)
Essential Coagulation Cofactor / Hemostatic Vitamin
Core agent

ICU role: Vitamin-K replacement when true deficiency or warfarin effect contributes to coagulopathy.

Choose: Use when vitamin-K deficiency is plausible or documented rather than simply because INR is elevated in cirrhosis.
Hesitate: Cirrhotic INR elevation is not corrected meaningfully by vitamin K when deficiency is absent and does not directly measure bleeding risk.

Monitor: Clinical bleeding, INR response only when deficiency/warfarin is relevant.

Clinical decision matrix

What changes the drug choice?

HE with 10 watery stools/day and Na 153

Preferred reasoning: Reduce/hold excessive lactulose, correct dehydration/electrolytes and continue precipitant treatment; resume titrated therapy later.
Avoid: Continuing aggressive lactulose until ammonia normalizes.

Why: Over-catharsis can worsen kidney function and encephalopathy.

Recurrent HE despite appropriate lactulose

Preferred reasoning: Add rifaximin while continuing precipitant prevention and individualized lactulose.
Avoid: Replacing lactulose with rifaximin solely because ammonia remains elevated.

Why: Rifaximin is best established as adjunctive recurrence prevention; HE remains a clinical syndrome.

HRS-AKI + SpO2 88% + pulmonary edema

Preferred reasoning: Do not start/continue terlipressin through hypoxia; correct volume/oxygenation and reassess candidacy/transplant/RRT strategy.
Avoid: Continuing because creatinine is improving.

Why: Current U.S. labeling has a boxed respiratory-failure warning and contraindicates use during hypoxia/worsening respiratory symptoms.

Cirrhosis + hematemesis

Preferred reasoning: Resuscitate deliberately, start portal-pressure vasoactive therapy and antibacterial prophylaxis where indicated, and arrange urgent endoscopy.
Avoid: Waiting for endoscopic proof of varices before starting a vasoactive agent in a high-probability presentation.

Why: Early coordinated pharmacologic and endoscopic management reduces ongoing portal hypertensive bleeding risk.

High-yield protocols

Mechanism-based sequences worth memorizing

Overt HE

  1. Identify/treat precipitants immediately.
  2. Use lactulose and titrate to clinical improvement / about 2–3 soft stools daily.
  3. Add rifaximin for recurrent/persistent disease when appropriate.
⚠️ Ammonia level alone neither diagnoses HE nor defines the treatment endpoint.

HRS-AKI terlipressin safety

  1. Confirm HRS-AKI phenotype and baseline oxygenation; do not initiate in hypoxia.
  2. Use response-guided terlipressin dosing with careful volume/albumin strategy.
  3. Stop/reassess for hypoxia, respiratory deterioration or ischemic symptoms.
⚠️ The 2026 U.S. label specifically emphasizes respiratory failure risk, volume overload and ACLF grade 3.
Organ failure & special settings

When standard pharmacology stops being standard

HRS + volume overload
Priority: Use albumin/fluids deliberately and reassess pulmonary status frequently during vasoconstrictor therapy.
Pitfall: Continuing escalating albumin despite pulmonary edema because HRS protocols mention albumin.
ACLF grade 3
Priority: Recognize high terlipressin respiratory-failure risk and coordinate transplant/critical-care strategy.
Pitfall: Treating all HRS phenotypes as equivalent candidates for terlipressin.
Variceal hemorrhage
Priority: Vasoactive agent + antibiotic prophylaxis + endoscopic hemostasis are complementary.
Pitfall: Using octreotide as definitive monotherapy.
Elevated INR in cirrhosis
Priority: Treat clinical bleeding/procedure risk and true deficiencies rather than INR number alone.
Pitfall: Giving vitamin K or plasma just to normalize cirrhotic INR without an indication.
Resident progression

R1 → R5 bedside cases

Recognition becomes selection, then organ-failure adjustment, competing physiology and senior-level prioritization.

R1

Hepatic encephalopathy

Cirrhotic patient is confused with asterixis after constipation and GI bleeding.

Show reasoning

Treat the bleeding/constipation precipitant and give lactulose titrated to clinical response and about 2–3 soft stools/day.

R2

Recurrent HE

Third HE admission despite appropriate lactulose use.

Show reasoning

Add rifaximin 550 mg twice daily while continuing individualized lactulose and prevention of triggers.

R3

Variceal bleed

Known cirrhosis presents with massive hematemesis and shock.

Show reasoning

Resuscitate, start a portal-pressure vasoactive agent such as octreotide per local protocol plus antibacterial prophylaxis, and arrange urgent endoscopic hemostasis.

R4

HRS-AKI candidate

Cirrhosis, rising creatinine, no shock/nephrotoxin/structural kidney cause, SpO2 96%, no volume overload.

Show reasoning

Use the current HRS-AKI pathway and consider terlipressin with careful albumin/volume strategy, monitoring SCr response and oxygenation continuously.

R5

HRS versus respiratory risk

ACLF, SCr rising, MELD very high, new pulmonary edema and SpO2 89% after albumin challenge.

Show reasoning

Do not force terlipressin into a hypoxic/high-risk phenotype. Treat respiratory/volume problems, reconsider albumin, coordinate transplant candidacy and renal-support strategy, and revisit HRS pharmacotherapy only if safety criteria improve.

Full medication monograph

Lactulose

First-line pharmacotherapy for overt hepatic encephalopathy in cirrhosis, titrated to clinical improvement and roughly 2–3 soft stools/day while avoiding dehydration, hypernatremia and hypokalemia from excessive diarrhea.

Dosing • renal/CRRT • toxicity • interactions →
Full medication monograph

Rifaximin

Poorly absorbed gut-directed rifamycin used mainly as add-on therapy to reduce recurrence of overt hepatic encephalopathy; it does not replace lactulose-based acute management or precipitant control in most ICU patients.

Dosing • renal/CRRT • toxicity • interactions →
Full medication monograph

Terlipressin

Vasopressin-receptor agonist approved in the U.S. to improve kidney function in adults with HRS and rapidly worsening kidney function. Benefit must be balanced against serious respiratory failure and ischemic risk, especially wit…

Dosing • renal/CRRT • toxicity • interactions →
Full medication monograph

Octreotide

Long-acting synthetic octapeptide somatostatin analog that selectively induces splanchnic arteriolar vasoconstriction (via inhibition of vasodilatory glucagon and VIP), reducing portal venous inflow and variceal hemorrhage pressu…

Dosing • renal/CRRT • toxicity • interactions →
Full medication monograph

N-Acetylcysteine

Specific antidote for acetaminophen poisoning and an important therapy in selected non-acetaminophen acute liver failure contexts.

Dosing • renal/CRRT • toxicity • interactions →
Full medication monograph

Ceftriaxone

Workhorse 3rd-generation cephalosporin with strong Gram-negative and pneumococcal coverage, dual biliary/renal clearance, and high CNS penetration at 2g IV q12h for bacterial meningitis.

Dosing • renal/CRRT • toxicity • interactions →
Full medication monograph

Vitamin K (IV)

Parenteral fat-soluble vitamin essential for post-translational gamma-carboxylation of clotting factors II, VII, IX, and X in the liver, providing sustained endogenous factor regeneration during warfarin reversal and severe coagu…

Dosing • renal/CRRT • toxicity • interactions →

Evidence & bedside-use boundary

This Masterclass teaches selection and reasoning. Exact dosing, concentration, infusion preparation, renal/hepatic/RRT adjustment and monitoring must be checked in the linked medication monograph and the institution's current formulary/protocol. Local resistance patterns and regulatory drug availability can change faster than a static teaching page.