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Also reported in: mg/L, mcmol/L
Your phenytoin level is within the target therapeutic range, providing effective seizure control with a good balance of efficacy and tolerability.
Your phenytoin level is far below the therapeutic range. At this level, there is virtually no anticonvulsant protection, placing you at significant risk of breakthrough seizures.
Contact your doctor immediately. A significant dose adjustment is needed, possibly with a loading dose. Do not miss doses.
Phenytoin: {{value}} {{unit}} — critically low (therapeutic: {{low}}–{{high}})Your phenytoin level is below the target range. This may not provide adequate seizure control. Phenytoin follows nonlinear (Michaelis-Menten) pharmacokinetics — small dose increases can cause disproportionately large changes in blood levels.
Discuss with your doctor. A dose increase is likely needed, but be cautious — small dose adjustments can cause large changes in blood levels.
Phenytoin: {{value}} {{unit}} — subtherapeutic (target: {{low}}–{{high}})Your phenytoin level is at the lower end of or just below the target range. Some patients achieve adequate seizure control at these levels, but the margin of safety is thin.
If you are seizure-free, discuss with your doctor whether a small dose increase is warranted. If you have had breakthrough seizures, a dose adjustment is needed.
Phenytoin: {{value}} {{unit}} — borderline lowYour phenytoin level is within the target therapeutic range, providing effective seizure control with a good balance of efficacy and tolerability.
Continue current dosing. Monitor phenytoin levels periodically, especially if new medications are added or if seizure control changes.
Phenytoin: {{value}} {{unit}} — within therapeutic range ({{low}}–{{high}})Your phenytoin level sits in the optimal therapeutic window — providing robust anticonvulsant protection while minimizing side effects.
Continue current regimen. Regular monitoring recommended.
Phenytoin: {{value}} {{unit}} — at optimal levelYour phenytoin level is above the target range. Early side effects include nystagmus (rapid eye movements), mild ataxia (unsteady gait), slurred speech, and drowsiness. These side effects become more prominent as levels rise.
Contact your doctor. A small dose reduction may be needed. Watch for symptoms of toxicity.
Phenytoin: {{value}} {{unit}} — borderline highYour phenytoin level is above the therapeutic range. At these levels, toxicity symptoms are common and include prominent nystagmus, significant ataxia, dysarthria (slurred speech), confusion, and drowsiness. Very high levels can cause seizures (paradoxical effect) and coma.
Contact your doctor and hold the next dose(s) as directed. Phenytoin toxicity resolves as the drug is metabolized. noticeable toxicity may require ICU monitoring.
Phenytoin: {{value}} {{unit}} — supratherapeutic (target: {{low}}–{{high}})A critically high phenytoin level causes noticeable neurotoxicity. Symptoms progress from ataxia and nystagmus to stupor, coma, respiratory depression, and paradoxically, seizures. Because of nonlinear kinetics, toxicity can escalate rapidly.
This is a medical emergency. Seek immediate care. Hold phenytoin. Supportive care in the ICU may be needed, including airway protection. Hemodialysis can remove phenytoin in noticeable cases.
Phenytoin: {{value}} {{unit}} — critically high (target: {{low}}–{{high}})Upload your lab report and get your actual values interpreted in plain English — instantly, with no medical training required.