Updated July 2026 · Hub page

The ICU Pharmacology Hub — Drips, Sedation, Antidotes & the Correction Rules

ICU nursing is, hour to hour, a pharmacology job. The pumps at the head of the bed are doing more minute-to-minute physiology than anything else in the room, and every one of those channels has a guide on this site: what the drug actually does at the receptor, how it is titrated, what the monitor shows when it is working, and the specific errors that hurt patients. This hub organizes the whole medication library by drug family so you can find the right guide in seconds.

Vasopressors and inotropes

The squeeze-versus-pump distinction is the whole game: pressors buy blood pressure, inotropes buy cardiac output, and choosing the wrong one treats the number instead of the patient. Norepinephrine is the default for a reason, vasopressin is the catecholamine-sparing second, and the rest are situational tools.

• Norepinephrine (Levophed) — the first-line pressor and how to titrate it honestly
• Vasopressin (Vasostrict) — the fixed-dose second pressor that isn't titrated
• Vasopressin physiology in septic shock — why the deficiency argument changes the timing
• Epinephrine — dose-dependent personalities and the lactate it manufactures
• Phenylephrine (Neo-Synephrine) — pure squeeze, and where reflex bradycardia helps
• Angiotensin II (Giapreza) — the third pathway for catecholamine-refractory shock
• Dobutamine — the inotrope that drops the pressure it's blamed for
• Milrinone — inodilation, the long half-life, and the renal caveat
• Milrinone vs dobutamine — choosing an inotrope by blood pressure and kidneys
• Norepi vs epi vs phenylephrine — the three-way receptor comparison
• Norepinephrine vs vasopressin — first pressor and second pressor, side by side

Sedation, analgesia and the RASS conversation

Modern ICU sedation is analgesia-first, lightest-effective-dose, and re-assessed constantly — the drips are easy to start and hard to stop well. The propofol series runs from mechanism to its rare lethal complication; the dexmedetomidine series covers the cooperative-sedation niche and the withdrawal syndrome nobody warned you about.

• ICU sedation & analgesia overview — the analgosedation framework, RASS and CPOT
• Propofol — the workhorse: titration, hypotension, and the lipid math
• Propofol mechanism & PRIS — what it does at GABA-A and when it turns on you
• Propofol infusion syndrome — the dose-times-duration trap and the early labs
• Propofol vs midazolam — wake-up times, delirium, and who still needs a benzo
• Dexmedetomidine (Precedex) — sedation that breathes, and the bradycardia tax
• Precedex vs propofol — extubation-window sedation, compared
• Precedex withdrawal — the rebound syndrome after long infusions
• Midazolam (Versed) — where benzodiazepine infusions still belong
• Fentanyl — the default ICU opioid and its context-sensitive half-life
• Fentanyl vs hydromorphone — potency, kinetics, and renal failure
• Ketamine — dissociation, hemodynamics, and the emergence caveat
• Ketamine analgosedation — the opioid-sparing infusion niche

RSI and neuromuscular blockade

Paralysis without sedation is the error this family of guides exists to prevent. The induction pair — etomidate or ketamine — and the paralytic pair — rocuronium or succinylcholine — cover nearly every intubation, and the long game belongs to cisatracurium.

• RSI: the nurse's role — the sequence, the timing, and what you own
• Etomidate vs ketamine for RSI — induction choice by hemodynamics
• Rocuronium vs succinylcholine — duration, contraindications, sugammadex
• Cisatracurium (Nimbex) — Hofmann elimination and ARDS paralysis done right
• Cisatracurium vs succinylcholine — the infusion paralytic vs the intubation dart

Cardiac drips: rate, rhythm and pressure

Every one of these is a titration conversation between the drug, the monitor, and your assessment. The rate-control pair (diltiazem, metoprolol) and the blood-pressure pair (labetalol, nicardipine) are the two decisions night shift makes most often.

• Amiodarone — loading, the two-phase infusion, and the long-term organ bill
• Amiodarone vs lidocaine — the VT/VF second-line choice
• Adenosine — six seconds of asystole on purpose
• Diltiazem (Cardizem) drip — rate control for AF with RVR
• Diltiazem vs metoprolol — calcium blocker or beta blocker for the fast AF
• Esmolol (Brevibloc) — the beta blocker with an off switch
• Labetalol vs nicardipine — hypertensive-emergency workhorses compared
• Clevidipine (Cleviprex) — the fast lipid-based titration and the fat calories

Anticoagulation and reversal

Half of this family is keeping blood thin on purpose; the other half is undoing it in a hurry. The heparin guides pair with the HIT alternatives, and the reversal guides are organized by which drug caused the bleeding.

• Heparin drip — weight-based protocols, anti-Xa vs aPTT, and the rebolus traps
• Argatroban & bivalirudin — anticoagulating the patient heparin tried to kill
• 4-factor PCC (Kcentra) — warfarin reversal in minutes, not units of plasma
• Andexanet alfa — reversing the factor Xa inhibitors
• Reversal in intracranial hemorrhage — the highest-stakes version of the decision

Electrolytes, insulin and the correction rules

Electrolyte replacement looks like scut work and is actually high-stakes pharmacology — the correction speed limits exist because correcting the number too fast injures the patient a second time. The insulin guides cover the DKA drip from initiation to the subcutaneous transition where most rebound happens.

• IV potassium replacement — rates, access, and the cardiac logic
• IV magnesium replacement — the electrolyte that fixes the other two
• Magnesium sulfate — torsades, eclampsia, and toxicity monitoring
• IV calcium — chloride vs gluconate, and membrane stabilization
• Calcium chloride vs gluconate — the three-to-one potency answer
• Mannitol & hypertonic saline — osmotherapy for the swelling brain
• Insulin drip for DKA — the gap closes before the glucose normalizes
• Drip-to-subQ transition — the overlap rule that prevents rebound DKA

Antidotes and toxicology pharmacology

The antidote guides live where the poisoned patients do. The counterintuitive ones are the point: hearts that need insulin at ten times the DKA dose, and opioid reversal dosed to breathing rather than wakefulness.

• Naloxone (Narcan) — titrating to respirations and the re-narcotization window
• N-acetylcysteine — the nomogram, the timing, and the liver it saves
• High-dose insulin euglycemic therapy — the beta-blocker/CCB overdose antidote that feels like an error
• Digoxin toxicity & DigiFab — when potassium is the prognostic marker

Foundations

• Critical care medications overview — the whole formulary at survey altitude
• High-alert medication safety — why these drugs get double checks
• Dosage calculations — mcg/kg/min math without fear

Keep going

The drugs make more sense next to the emergencies they treat — the ICU emergencies library organizes those guides by system, and the ICU devices & life-support hub covers the machines the drips keep company with. If mastering this pharmacology is the part of the job you love, that instinct is the core of anesthesia — the CRNA career hub maps that road end to end. And for catching drug-induced trouble before it becomes a code, start with acquired long QT & QTc monitoring.

Educational content for licensed clinicians. Always follow your facility's protocol, pharmacy guidance, and provider orders. Not medical advice.