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Popular Brands: Dilantin, Phenytoin, Dilantin-125, Epanutin, Hydantol
Official FDA Reports102,360
Social Media Events1,319
Total Posts1,542
Avg. Review Score3.55/ 5
Active Ingredients
  • Phenytoin
Approved Uses *

* Extracted from Drug Label

Brands and Other Names
  • Dilantin
  • Phenytoin
  • Dilantin-125
  • Epanutin
  • Hydantol
Show more brands
  • Actavis Mid Atlantic Llc
  • Cardinal Health
  • Greenstone Llc
  • Parke Davis Div Warner Lambert Co

  This report is for all products sharing this active ingredient. For more details, please use our Workbench for research on individual brands like Dilantin.

* Extracted from FDA Adverse Event Report


The quarterly trend chart illustrates changing levels of adverse events over time. Results from both the FDA Adverse Event Database (FAERS) and adverse events extracted from social media by Druginformer are plotted side-by-side for easy comparison.

The proportion of people completing user reviews who complained about a side effect.

The proportion of social media adverse event complaints for each adverse event type.

The proportion of FAERS (FDA) adverse event complaints for each adverse event type.

Phenytoin Side Effects

  Social Media
(Online Comments)
(Reports Submitted to FDA)
Side Effect On Drug
Reports % of
Alarm Reports % of

* DrugInformer calculates alarm using a proprietary algorithm. Alarm should not be taken as an ofiicial signal from the FDA or other regulatory entity.

User Voices

The following are comments from users that experienced side effects while taking Phenytoin


Side Effects: gum swelling

to prevent seizures after being exposed to lead in our old house in Philadelphia I started having seizues after testing there was no evidence of elipesy or...

Source: Dilantin (Phenytoin)

View full report on Phenytoin related swelling

Did the author experience swelling while taking phenytoin?

What is this?


Side Effects: Dizziness

Dilantin provided Control of seizures (mostly petits) as these were more frequent. Generally, the drug is still as effective as when first introduced to me ...

Source: Dilantin (Phenytoin)

View full report on Phenytoin related dizziness

Did the author experience dizziness while taking phenytoin?

What is this?

Injection Site Pain

... burning sensation that lasted several minutes after each injection. After 3 weeks I was changed to oral dilantin (100mg 3 times daily). So no more painful injections .

The benefits were...

Source: Dilantin (Phenytoin)

View full report on Phenytoin related injection site pain

Did the author experience injection site pain while taking phenytoin?

What is this?

Additional Drug Information

* Warning: The facts and figures contained in these reports are accurate to the best of our capability; however, our metrics are only meant to augment your medical knowledge, and should never be used as the sole basis for selecting a new medication. As with any medical decision, be sure to work with your doctor to ensure the best choices are made for your condition.

* About FAERS: The FDA Adverse Event Reporting System (FAERS) is used by FDA for activities such as looking for new safety concerns that might be related to a marketed product, evaluating a manufacturer's compliance to reporting regulations and responding to outside requests for information. Reporting of adverse events is a voluntary process, and not every report is sent to FDA and entered into FAERS. The FAERS database may contain duplicate reports, the report quality is variable, and many factors may influence reporting (e.g., media attention, length of time a drug is marketed, market share). For these reasons, FAERS case reports cannot be used to calculate incidence or estimates of risk for a particular product or compare risks between products.