PhenytoinPrices, Coupons & Savings

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*Based on the difference between the U&C price submitted and the price the patient paid, as of April 2023.

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  1. Medication
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  2. Phenytoin Sodium
    Generic for Dilantin
    30 capsules $5.1 USD
    Save $13.80
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Save up to 90% of your branded or generic medications using the Now Patient Rx Advantage Card

Do you need a prescription for phenytoin?

Yes, phenytoin is only available with a valid physician Rx.

How much is phenytoin without Insurance in the US?

Our website gives two competitive savings options to US customers who wish to purchase phenytoin, as either a brand or generic, if available. The first is access to medications through our mail-order online pharmacy. The second is by using the Now Patient Rx Advantage Card, which can be used in over 65,000 pharmacies nationwide, across America. If you are insured, then in most cases, the cash price will be significantly cheaper than the copay.

What will my out-of-pocket cost be for phenytoin in the US?

There are no out-of-pocket (OOP) costs because we are currently only offering a cash-based option to purchase medications.

Is Now Patient a phenytoin savings card?

Yes. Save up to 90% on your phenytoin with the FREE Now Patient Rx Advantage card*.
*Based on the difference between the U&C submitted by the pharmacy and the price the patients pay.

Can you handle Rx transfers for home delivery in the US?

Yes. If you use the mail-order online pharmacy option, then we can handle requests by you to have your prescription transferred to our pharmacy for home delivery. We can even help you manage your refills by giving you timely reminders, so you do not run out of your medication.

Is Now Patient a phenytoin coupon provider in the US?

No. Now Patient does not provide phenytoin coupons or FREE phenytoin samples.

Do you accept commercial, Medicare or Medicaid coverage for phenytoin in the US?

No. Currently, we only offer cash-based options for purchase, therefore we do not require your insurance benefit details. In the future, our plan is to be able to handle commercial insurance, Medicare and Medicaid including cases where you have multiple health plans that provide benefit coverage (e.g. Medicaid and Commercial). We also anticipate being able to handle more complex scenarios such as using primary insurance combined with a manufacturer copay assistance program.

Does Now Patient work with Medicare?

Our cash-based prices for medications are typically cheaper than Medicare copays. We do not bill Medicare Part D (standalone drug coverage) or Medicare Advantage (combined health and drug coverage). When you purchase your medication from Now Patient, you will be doing so out of your pocket. The spend will not count towards your plan deductibles or gaps.

Does Now Patient work with Commercial Insurance?

Our cash-based prices for medications are typically cheaper than commercial plan copays. We do not bill your commercial plan. When you purchase your medication from Now Patient, you will be doing so out of your pocket. The spend will not count towards your plan deductibles or gaps.

What should you do if you use too much phenytoin?


Call your doctor right away or seek immediate medical attention if your symptoms do not improve or they become worse after using phenytoin. You can also call 800-222-1222 to reach the American Association of Poison Control Centers or use its online resource if you think you’ve used too much phenytoin. But if you have severe symptoms, call 911 (or your local emergency number) immediately or go to the nearest emergency room.


If you think it is an emergency, call 999 or find your nearest A&E
If you need help now, but it’s not an emergency go to 111.nhs.uk or call 111. Alternatively you can speak to one of our pharmacists or use the Now Patient app to make an appointment with your GP.

What should I do if I miss my dose?

There are occasions when people forget to take their medication at correct prescribed times. This may not only have an effect on potentially making the medication less effective but it may also inadvertently lead to taking doses too close together, thereby increasing the risks of side effects.

Click here to find out what to do if you forgot to take your medication

What is generic phenytoin?

Generic phenytoin refers to the non-brand-name version of the medication. It contains the same active ingredient as the brand-name drug but is typically less expensive.

FDA approval of phenytoin

Phenytoin is approved by the U.S. Food and Drug Administration (FDA) for the treatment of various types of seizures, including generalized tonic-clonic seizures and complex partial seizures.

Active ingredient of phenytoin

The active ingredient of phenytoin is phenytoin, which is classed as an anti-epileptic drug, also called an anticonvulsant.

US brand name of phenytoin and manufacturer

Phenytoin is available in the US under various brand names, including Dilantin and Phenytek. The manufacturers may vary depending on the brand names.

UK brand name of phenytoin and manufacturer

In the UK, phenytoin is available under various brand names, including Epanutin and phenytoin. The manufacturer may vary depending on the brand name.

Prescription requirement for phenytoin

A prescription (Rx) is required for phenytoin in both the US and the UK.

Availability of phenytoin in the UK with NHS prescription

Phenytoin is available in the UK with an NHS prescription.

Conditions treated by phenytoin

Phenytoin is used for the treatment of various types of seizures, including generalized tonic-clonic seizures, complex partial seizures, and seizures associated with epilepsy.

How does phenytoin work?

The exact mechanism of action of phenytoin in the treatment of seizures is not fully understood. It is believed to work by stabilizing the electrical activity in the brain, reducing the excessive and abnormal firing of nerve cells that can cause seizures.

Forms of phenytoin available

Phenytoin is available in various forms, including oral capsules, chewable tablets, extended release tablets and an injectable formulation which may be administred by intravenous or intramuscular injection.

Dosage of phenytoin

The dosage of phenytoin may vary depending on the specific type of seizure being treated, the individual’s weight, age, and other factors. It is important to follow the recommended dosage instructions provided by the healthcare provider.

If you forget to take your medication, take it as soon as you remember. Do not take the missed dose if it is almost time for your next dose. Store phenytoin at room temperature away from moisture, light, and heat.

Directions for phenytoin use

Take phenytoin as directed by the healthcare provider. The specific instructions may include the timing of administration, dosage adjustments, and any necessary precautions.

Warnings and precautions for phenytoin

  • Phenytoin may interact with other medications and substances, and dosage adjustments or close monitoring may be necessary
  • Phenytoin may cause side effects such as dizziness, drowsiness, and coordination problems. It is important to use caution when performing activities that require mental alertness or physical coordination
  • Suddenly stopping phenytoin may lead to a life-threatening condition known as status epilepticus (continuous seizures)
  • Hypersensitivity to phenytoin or other hydantoins is a contraindication for using phenytoin
  • Phenytoin may pass into breast milk. Speak to your clinician before breast-feeding when taking phenytoin
  • Speak to your doctor before using phenytoin if you have or have ever had hepatic disease (liver disease), diabetes, suicidal thoughts or actions (report any new or worsening symptoms when taking phenytoin), a vitamin D deficiency, or porphyria (a genetic enzyme disorder, affecting the skin or nervous system)
  • Avoid alcohol, as it may increase or decrease your serum levels of phenytoin

Interactions with other drugs

Phenytoin may have an increased risk for drug interactions in patients taking other drugs, such as amiodarone, blood thinners such as warfarin, antifungal medications such as fluconazole, diazepam, folic acid, H2 antagonists such as cimetidine, medications for seizures such as carbamazepine, lamotrigine, phenobarbital, and valproic acid, omeprazole, theophylline, and vitamin D. Also, tell your doctor if you are taking antacids containing calcium, magnesium, or aluminum. It is important to inform your healthcare provider about all the medications you are taking including vitamins and herbal supplements, to avoid potential interactions.

Possible side effects of phenytoin

Common side effects of phenytoin may include dizziness, drowsiness, nausea, and rash. More serious adverse effects include hypotension, bradycardia, and cardiac arrhythmias with rapid administration of phenytoin. Phenytoin therapy has also been linked to life-threatening skin reactions such as Stevens–Johnson syndrome and toxic epidermal necrolysis. These conditions are more common in patients with an Asian ancestry. If these adverse effects persist or worsen, it is important to contact a healthcare professional.

Similar drugs to phenytoin

Similar drugs to phenytoin include ethotoin, fosphenytoin, or mephenytoin. Other antiepileptic medications, such as carbamazepine, valproic acid, and lamotrigine, may be used as alternatives to phenytoin for the treatment of seizures.



Now Patient has taken all reasonable steps to ensure that all material is factually accurate, complete, and current. However, the knowledge and experience of a qualified healthcare professional should always be sought after instead of using the information in this page. Before taking any drug, you should always speak to your doctor or another qualified healthcare provider.

The information provided here about medications is subject to change and is not meant to include all uses, precautions, warnings, directions, drug interactions, allergic reactions, or negative effects. The absence of warnings or other information for a particular medication does not imply that the medication or medication combination is appropriate for all patients or for all possible purposes.

About Now Patient

Now Patient’s online services are available in the US and UK. We help you manage your prescriptions, doctor appointments, test results, health risks, and a lot more, all in one place for FREE. If you are in the United States, you could enjoy savings using Now Patient’s mail-order pharmacy or use the Now Patient Rx Advantage Card at over 65,000 pharmacies, with savings of up to 90% on popular FDA-approved brand and generic medications like Ozempic, Mounjaro, clopidogrel and lots more. We do not currently handle commercial insurance, Medicare or Medicaid. UK NHS and private prescriptions are delivered FREE of charge across England & Wales by our UK NHS online pharmacy.

Stefano Mirabello Medical Reviewer
Pharmacist / B.Pharm
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