Here is a commonly referenced list of medications that should NEVER be given as a direct IV push / IV bolus (rapid undiluted injection into the vein) in adults because of serious risks — extreme toxicity, cardiac arrest, severe tissue damage, arrhythmias, hypotension, anaphylaxis, or death.

High-Risk Drugs — Never Give Direct IV Bolus / Rapid Push

Drug Main Reason Never Give Rapid IV Push What to Do Instead Typical Emergency Concentration Potassium chloride (KCl) Cardiac arrest, fatal arrhythmias Always dilute and infuse slowly Never undiluted Potassium phosphate Same as KCl + severe hyperphosphatemia risk Dilute and infuse slowly Never undiluted Calcium chloride 10% Severe tissue necrosis if extravasation, rapid hypercalcemia, arrhythmias Infuse slowly (usually over ≥10–20 min) or via central line 10–20 min minimum Calcium gluconate 10% Less irritating than chloride but still causes arrhythmias if pushed fast Usually can be pushed slowly in emergency (3–5 min), but not rapid bolus 3–5 min in arrest, otherwise slower Digoxin Fatal arrhythmias, asystole Infuse over ≥5 min (usually 10–30 min) Never <5 min Magnesium sulfate 50% Hypotension, bradycardia, cardiac arrest, respiratory arrest Dilute and infuse over 10–60 min (except in eclampsia/torsades protocol) Never rapid undiluted push Hypertonic saline (3%, 5%, 23.4%) Severe osmotic demyelination, pulmonary edema, heart failure, vein rupture Infuse slowly via central line (23.4% almost never pushed) Never rapid bolus Mannitol 20–25% Rapid volume shift → pulmonary edema, heart failure Infuse over 30–60 min Never rapid push Promethazine (Phenergan) Severe tissue necrosis / gangrene on extravasation Dilute and infuse over 10–15 min Never push Vancomycin “Red man syndrome”, severe hypotension Infuse over ≥60 min (usually 1–2 h) Never push Amiodarone Hypotension, bradycardia, asystole Bolus over 10 min (150 mg), then infusion Never <10 min Adenosine Actually intended to be rapid bolus, but must be followed immediately by large saline flush Rapid 6 mg → 12 mg push + flush Exception – must be rapid Protamine sulfate Severe hypotension, anaphylaxis, pulmonary hypertension Infuse slowly over 10 min Never rapid push Phytonadione (Vitamin K) IV Anaphylactoid reaction, shock, cardiac arrest Prefer subcutaneous or oral; if IV → very slow Over ≥20–30 min if must be IV Iron dextran / Iron sucrose (some formulations) Anaphylaxis Dilute and infuse slowly Never push Phenytoin / Fosphenytoin Cardiovascular collapse, arrhythmias Infuse slowly (max 50 mg/min phenytoin, 150 mg PE/min fosphenytoin) Never push Diazepam IV undiluted Precipitation, phlebitis, severe irritation Dilute or use emulsion form Prefer lorazepam/midazolam Fluorouracil (5-FU) Extreme tissue necrosis on extravasation Infuse slowly Never push Vincristine Fatal if given intrathecally (but also severe local damage IV) Strict protocols; never push in some settings —

Quick “Never Rapid IV Push” Memory List (most frequently cited in hospitals)

• Potassium chloride
• Potassium phosphate
• Magnesium sulfate 50%
• Calcium chloride
• Digoxin
• Promethazine
• Vancomycin
• Hypertonic saline
• Protamine
• Phytonadione (IV)
• Amiodarone (must be ≥10 min)

If you’re preparing or checking a high-alert medication list in your hospital / ICU / emergency setting, these are the ones that appear most consistently on “do NOT give IV push” warnings.

Do you want the list expanded for pediatric doses, specific concentrations, or focused on emergency crash-cart drugs?