phenytoin vs pregabalin
Side-by-side comparison of phenytoin and pregabalin. Data from FDA drug databases (Orange Book, NDC Directory, recalls, shortages) covering 20,000+ approved drugs, plus CMS pricing; see our methodology.
minor Known Drug Interaction
Specifically, there are no pharmacokinetic interactions between pregabalin and the following antiepileptic drugs: carbamazepine, valproic acid, lamotrigine, phenytoin, phenobarbital, and topiramate.
Recommendation: You can generally take these medicines together without adjusting the dose. Follow your healthcare provider's standard instructions for both medications.
Dilantin
Lyrica
Phenytoin injection is used to treat certain types of seizures. It can also prevent seizures during or after neurosurgery.
Pregabalin (Lyrica) is a medicine that can help manage nerve pain, fibromyalgia, and partial-onset seizures. It works by calming overactive nerves in your body.
This medicine treats generalized tonic-clonic status epilepticus, a type of prolonged seizure. It also helps prevent and treat seizures that may happen during or after brain surgery. Sometimes, it can be used for a short time instead of the oral form of phenytoin when you cannot take the medicine by mouth.
This medicine is used to treat nerve pain caused by diabetes, shingles, or spinal cord injury. It can also help with fibromyalgia, a condition that causes widespread pain. Pregabalin can also be used with other medicines to treat partial-onset seizures in adults and children as young as 1 month old.
Phenytoin works by slowing down the signals in the brain that cause seizures. It stabilizes nerve cell membranes, reducing excessive electrical activity. This helps to prevent seizures from starting or spreading.
Pregabalin works by binding to certain areas in your brain and spinal cord. This action helps to reduce the release of chemicals that send pain signals. By reducing these signals, pregabalin can help to lessen pain and control seizures.
No common side effects listed.
- • Dizziness
- • Sleepiness
- • Dry mouth
- • Swelling
- • Blurred vision
- The medicine is reacting with another medicine 1,547
- Seizure 1,382
- Poisoning from different substances 1,353
- Convulsion 1,260
- Prolonged seizure 790
- Pain 25,904
- Tiredness 15,111
- Feeling dizzy 14,526
- Feeling sick to your stomach 14,050
- Headache 12,681
This medicine can cause serious heart problems if given too quickly. The injection rate should not be faster than 50 mg per minute for adults, and 1 to 3 mg/kg/min (or 50 mg per minute, whichever is slower) for children. Your heart will be monitored closely during and after the injection.
Pregabalin can cause swelling of the throat, head, and neck, which can be life-threatening. Get emergency help right away if this happens. This medicine can also increase the risk of suicidal thoughts or behavior. Watch for any changes in your mood or behavior. Pregabalin may cause dizziness and sleepiness, so be careful driving or operating machinery. Do not stop taking pregabalin suddenly, as this can cause increased seizures or other side effects.
Taking phenytoin during pregnancy may increase the risk of birth defects. If you are pregnant or plan to become pregnant, talk to your doctor about the risks and benefits of this medicine.
Taking pregabalin during pregnancy may slightly increase the risk of birth defects. If you are pregnant or plan to become pregnant, talk to your doctor about the risks and benefits of taking this medicine. Breastfeeding while taking pregabalin is not recommended.
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How to Read This phenytoin vs pregabalin Comparison
phenytoin is classified in the Anticonvulsant (Hydantoin) drug class, while pregabalin sits within the Anticonvulsant / Nerve Pain Agent class. Drugs from different classes work through distinct mechanisms, so a head-to-head comparison illustrates trade-offs rather than equivalence. Both drugs are prescription-only, so a licensed provider must authorize use.
Adverse event totals above are pulled from the FDA's Adverse Event Reporting System (FAERS). For these top-ranked reactions alone, phenytoin has 6,332 submissions while pregabalin has 82,272. Those figures reflect cumulative reporting volume, not per-patient risk, so older, widely dispensed drugs typically look worse on count alone. These two drugs have a known minor interaction flagged in FDA labeling, attributed to these drugs do not interfere with each other's levels in the blood. they can be used together without one drug changing how the other works in the body.. Serious warnings, pregnancy guidance, and contraindications can differ even when indications overlap.
A table cannot substitute for clinical judgment. Effectiveness, tolerability, drug-drug interactions with your other medications, kidney and liver function, pregnancy status, insurance formulary, and price all feed into a decision that only a licensed prescriber can make responsibly. Data here is sourced from FDA Structured Product Labels (SPL) and FAERS, both of which update as manufacturers and clinicians submit new information. This page is for educational purposes only, is not medical advice, and should not be used to self-switch between phenytoin and pregabalin - always consult your physician or pharmacist first.
Important: This comparison is for informational purposes only. Drug effects vary between individuals. Always consult your doctor or pharmacist for personalized medical advice.