Updated July 2026 · 7 min read

Purple Glove Syndrome for ICU Nurses 2026 — When an IV Phenytoin Dose Turns the Hand Dark

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You push or hang a dose of IV phenytoin for status epilepticus or seizure prophylaxis, and over the next hours the hand below the IV site starts to change. First a dusky discoloration around and distal to the cannula, then swelling, then a deep purple-black hue spreading toward the fingers, with pain that seems out of proportion to a "working" IV. The line may still flush. There may be no obvious infiltrate. This is purple glove syndrome — a progressive, potentially limb-threatening soft-tissue injury linked to intravenous phenytoin, and one of the reasons the drug is being pushed out of front-line IV use in favor of its prodrug.

Why phenytoin does this to a limb

Intravenous phenytoin is a chemically hostile solution. To keep the poorly-soluble drug in solution it is formulated at a strongly alkaline pH (around 12) with propylene glycol and ethanol as vehicles. When that solution enters a small peripheral vein — especially a hand or wrist vein, in an older patient with fragile vessels, given rapidly or repeatedly — it irritates and injures the vessel wall and surrounding tissue. The result is a spreading soft-tissue injury: local vasoconstriction, endothelial damage, microvascular thrombosis, and leakage of the caustic drug into the tissues. What makes purple glove syndrome insidious is that it does not require a blown IV or a visible infiltrate — the discoloration can appear while the line still draws and flushes, because the injury is happening within and around the vein itself, not just from fluid pooling in the tissue. The name captures the appearance: a purple, glove-like discoloration of the hand and distal forearm.

How it presents and how it progresses

The hallmark is a triad that evolves over time distal to (and around) the IV site: discoloration, edema, and pain. It often begins within hours of the dose but can appear up to a day or two later, and it can keep progressing after the infusion is long finished.

Risk is higher with advanced age, repeated or high IV phenytoin doses, rapid administration, small distal veins (hand/wrist), and pre-existing vascular disease. The severity is unpredictable: many cases stay mild and resolve over days to weeks as the discoloration fades, but a minority march on to necrosis, compartment syndrome, and amputation. Because you cannot know at onset which trajectory a given limb will take, every case is treated as potentially serious and watched closely.

Bedside priorities: stop, elevate, protect the limb

There is no antidote and no single proven treatment — management is supportive and centered on halting further exposure and protecting perfusion. The first step is to stop the phenytoin infusion immediately and, per your facility's extravasation and vesicant protocol, decide with the provider whether to leave the catheter in briefly to aspirate residual drug or to remove it. Elevate the affected limb to reduce edema, keep it warm and protected, and remove any constricting items (tape, ID bands, jewelry) that could act as a tourniquet as swelling rises. Then monitor the limb intensely: mark the border of discoloration and swelling so you can track spread, and perform serial neurovascular checks — color, temperature, capillary refill, distal pulses, movement, and sensation — alongside pain assessment. Escalate urgently for signs of compartment syndrome: pain out of proportion, pain on passive stretch, tense swelling, paresthesias, or a diminishing pulse. Notify the provider and pharmacy, document with photographs and time-stamped measurements, and switch future doses to an alternative agent. Severe cases may need surgical or plastics consultation for fasciotomy or debridement; most milder cases resolve with time, elevation, and wound care.

The nursing bottom line

Purple glove syndrome is a caustic-drug soft-tissue injury unique to intravenous phenytoin, in which the limb distal to the IV site progressively discolors, swells, and hurts — sometimes marching on to necrosis, compartment syndrome, and limb loss. It can occur without a visible infiltrate and while the line still flushes, so a normal-looking IV never rules it out. The nurse's job is to catch the early dusky discoloration, stop the infusion, elevate and protect the limb, and monitor perfusion relentlessly while escalating any hint of compartment syndrome. Best of all is to prevent it: favor fosphenytoin, and when phenytoin must be given IV, use a large proximal vein, a slow rate, and frequent site checks. The dark hand below a phenytoin drip is a warning to act, not a curiosity to watch.

Related: Phenytoin & fosphenytoin · Extremity compartment syndrome · Antiseizure medication loading

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