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Buy Dilantin Online
(Phenytoin Sodium)

What is Dilantin?

What is Dilantin?

Dilantin is an anti-epileptic drug (anticonvulsant) that is used to treat specific types of seizures called tonic-clonic (grand mal) and psychomotor (temporal lobe) seizures. It helps treat symptoms of epilepsy by regulating seizures. Additionally, it works to prevent and treat seizures that happen during or after brain surgery.

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Purchase Dilantin from Universal Drugstore today and save!

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  • 30mg
  • 50mg
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Dilantin brand

Dilantin 
30mg

Prescription Required
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Prescription Required
Product of Canada

Product of Canada

Dilantin 
50mg

Prescription Required
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Prescription Required
Product of Canada

Product of Canada

Marketed as Dilantin Infatabs in Canada.

Dilantin 
100mg

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Prescription Required
Product of India

Product of India

Also available from Canada and New Zealand
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Prescription Required
Product of Canada

Product of Canada

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Prescription Required
Product of New Zealand

Product of New Zealand

Phenytoin Sodium (generic Dilantin)

What are generics?

Phenytoin Sodium 
100mg

Prescription Required
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Prescription Required
Product of India

Product of India

Marketed as Celetoin in India.

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Important information about Dilantin

The active ingredient in Dilantin is phenytoin sodium. It operates by slowing down impulses and calming overactive nerves in the brain that initially cause seizures.

Follow all directions given to you by your doctor and read all documents provided, including the full Prescribing Information, FDA-Approved Product Labeling, Instructions for Use, and Medication Guide before using Dilantin. However, the following is a synopsis of the general guidelines for the use of Dilantin:

  • Take this medication orally as directed by your physician.
  • If you miss a dose, take it as soon as you can. If it is almost time for your next dose, take only that dose. Do not take double doses.
  • Avoid drinking alcohol since alcohol intake can increase blood levels of phenytoin, which can increase the side effects experienced.
  • A decrease in vitamin D and folic acid levels in the blood can be experienced while taking Dilantin. Adequate vitamin intake is crucial.

The most common side effects of Dilantin include:

  • Difficulty with paying attention, memory, or speech.
  • Dizziness.
  • Drowsiness or tiredness.
  • Headache.
  • Trouble sleeping.

Some individuals may experience serious side effects while using Dilantin. These side effects may require immediate medical attention. If you experience any of the following, contact your healthcare provider or seek emergency medical help:

  • Serious and sometimes life-threatening allergic reactions - skin rash, skin reaction, itching, hives, swelling.
  • Liver problems - upper stomach pain, loss of appetite, nausea, dark yellow urine, unusual fatigue, yellowing of the skin or eyes.
  • Infection - fever, chills, cough, sore throat, swollen lymph nodes, unusual bleeding.
  • High blood sugar (hyperglycemia).
  • Thoughts of suicide or self-harm or worsening mood.
  • Heart problems - low heartbeat, dizziness, chest pain, feeling lightheaded, confusion, trouble breathing.
  • Phenytoin toxicity - abnormal eye movement, loss of balance or coordination, trouble speaking, unusual fatigue, vomiting.

These are not all of the possible side effects of Dilantin. You should always seek medical advice from your healthcare provider for any questions or concerns about your medical condition or treatment. Read all patient information, medication guides, or drug information sheets that come with this medication. You can also report adverse effects to the Food and Drug Administration at www.fda.gov/medwatch or 1-800-FDA-1088.

Before starting Dilantin, it is crucial to discuss any existing health conditions with your healthcare provider. You should be sure that your healthcare provider is aware of all your medical conditions, including if you have:

  • Heart problems.
  • Liver disease.
  • Diabetes.
  • Depression.
  • Suicidal thoughts.
  • Vitamin D deficiency or any other condition that causes thinning of the bones.
  • Porphyria (a genetic enzyme disorder that causes symptoms affecting the skin or nervous system).
  • Asian ancestry.

  • If a woman is pregnant.
  • Hypersensitivity reaction to phenytoin or fosphenytoin.
  • Current intake of delavirdine.

It takes about 7 to 10 days for the levels of phenytoin in your body to stabilize on a normal starting dose. Then your healthcare provider will gradually increase the dose to an appropriate amount. It can take up to 4 weeks before you start to feel the full benefits of this drug.

When Dilantin is taken with other prescription drugs, over-the-counter medications, vitamins, and supplements, it may change how they work or increase the frequency or severity of side effects. Make sure that you tell your healthcare professional about anything that you are taking to avoid any negative drug interactions, including:

  • St. John's Wort.
  • Blood thinning medications (warfarin, dabigatran, rivaroxaban).
  • Calcium carbonate.
  • Female hormones (estrogen, birth control pills).
  • Medications for stomach problems (antacids, cimetidine, sucralfate).
  • Other seizure medications (carbamazepine, ethosuximide, lamotrigine, phenobarbital, topiramate, vigabatrin).
  • Delavirdine.

Dilantin comes in a variety of forms, including:

  • Immediate release capsule.
  • Liquid suspension.
  • Chewable tablet.

Store at room temperature away from moisture and light, and keep out of reach of children.

Pfizer is the pharmaceutical company that manufactures Dilantin.

There are lower-cost generics available for the brand name Dilantin.

Do not start or adjust your use of this medication without first consulting with your doctor. Stopping Dilantin suddenly can cause seizures that will not stop (status epilepticus).

Do not take this medication if you are pregnant since your baby is at risk for serious birth defects and bleeding problems right after birth. Talk to your doctor if you are already pregnant or if you have any plans to become pregnant. They will know or recommend what is best for you.

It may not be safe to breastfeed while using this medication. Talk to your doctor if you are already breastfeeding or if you have any plans to breastfeed. They will know or recommend what is best for you.

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Important information about buying Dilantin from UniversalDrugstore™

Once you complete your order, we process, verify, and dispatch your medication. You’ll receive email updates at each stage, including tracking details once your order ships. If any additional documentation is needed (such as a valid prescription), we’ll contact you promptly. Once approved, your order is charged and delivered directly to your doorstep.

Orders are typically processed within 1–3 business days once all required documents are received and approved. Standard delivery times range from 10–18 business days, depending on your location.

Yes! Once your medication ships, you will receive an email with tracking information so you can monitor your shipment every step of the way.

Our Customer Care team is available 24/7 to assist with any order-related concerns or questions. If you experience delays, missing items, or need support, contact us using the details provided in your confirmation email.

All orders are shipped in discreet, plain packaging to protect your privacy. Medications are securely packaged to prevent damage and ensure they arrive in top condition.

Yes. We use cold-chain shipping methods to safely transport temperature-sensitive medications, ensuring they maintain proper storage conditions throughout delivery.

Shipping costs vary depending on your location and shipping method. Free shipping promotions may be available—check the checkout page for the latest offers. Orders above $100 going to a US destination will receive free shipping.

Currently, we do not bill Medicare or Medicaid directly. However, we provide detailed receipts and documentation that you can submit to your insurance provider for potential reimbursement.

Universal Drugstore does not bill private health insurance directly, but we provide a detailed invoice that you can submit to your insurer for possible reimbursement. Many insurers will accept Universal Drugstore’s documents, but if you have any questions, check with your insurance company prior to purchasing.

We use advanced SSL encryption and secure payment processing to ensure that all transactions are 100% protected against fraud and unauthorized access.

Universal Drugstore offers many generic alternatives that provide the same active ingredients at a lower cost. Search for your medication and compare pricing for generic vs. brand-name options. Generic availability depends on the medication.

If your medication requires a prescription, you must upload it online, via email, or fax. Over-the-counter (OTC) medications do not require a prescription. All prescription medication purchases require a valid and approved prescription. The Universal Drugstore customer care team can contact your doctor directly to get your prescription, and ensure all information is up to date.

Yes! You can add multiple medications to your cart, including prescription, OTC, and pet medications, and complete your purchase in a single checkout process.

Yes! If your prescription includes refills, you can reorder quickly by logging into your account and selecting your medication for a hassle-free refill process. Always refill your medication proactively and ontime, to ensure you do not run out of important medication.

Yes! We offer:

  • Up to 80% savings on medications
  • Price match guarantee – we’ll match competitor pricing on qualifying medications
  • 10% off your first order for new customers

We offer 24/7 customer support via phone, email, and chat. Visit our Contact Us page for assistance with ordering, shipping, or medication questions.

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Medical Disclaimer

The information, including but not limited to, text, graphics, images and other material contained on this website are for informational purposes to increase health awareness only. No material on this site is intended to be a substitute for professional medical advice, diagnosis or treatment. 



Always seek the advice of your physician or other qualified health care provider with any questions you may have regarding a medical condition or treatment and before undertaking a new health care regimen, and never disregard professional medical advice or delay in seeking it because of something you have read on this website.