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What is this medicine?
PHENYTOIN is used to control seizures in certain types of epilepsy. It is also used to prevent seizures during or after surgery.
What should I tell my health care provider before I take this medicine?
They need to know if you have any of these conditions:
- an alcohol abuse problem
- blood disorders or disease
- heart problems
- kidney disease
- liver disease
- receiving radiation therapy
- suicidal thoughts, plans, or attempt; a previous suicide attempt by you or a family member
- thyroid disease
- an unusual or allergic reaction to phenytoin, other medicines, foods, dyes, or preservatives
- pregnant or trying to get pregnant
How should I take this medicine?
Take this medicine by mouth with a glass of water. Chew it or swallow whole. Follow the directions on the prescription label. Take this medicine with food if it upsets your stomach. Take your doses at regular intervals. Do not take your medicine more often than directed. Do not stop taking this medicine suddenly, this increases the risk of seizures. Your doctor will tell you how much medicine to take. If your doctor wants you to stop the medicine, the dose will be slowly lowered over time to avoid any side effects.
Talk to your pediatrician regarding the use of this medicine in children. While this drug may be prescribed for selected conditions, precautions do apply.
Overdosage: If you think you have taken too much of this medicine contact a poison control center or emergency room at once.
NOTE: This medicine is only for you. Do not share this medicine with others.
What if I miss a dose?
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 or extra doses.
What may interact with this medicine?
Do not take this medicine with any of the following:
This medicine may also interact with the following:
- aspirin and aspirin-like medicines
- barbiturate medicines for inducing sleep or treating seizures
- calcium supplements
- cimetidine or other medicines for heartburn or stomach ulcers
- corticosteroid hormones such as prednisone or cortisone
- enteral feedings (liquid nutritional drinks or tube feeding liquids)
- female hormones, including contraceptive or birth control pills
- medicines for mental depression, anxiety or other mood problems
- medicines to control heart rhythm
- rifampin, rifabutin or rifapentine
- sulfonamides like Azulfidine or Bactrim
- valproic acid
- vitamin D
Tell your prescriber or health care professional about all other medicines you are taking, including non-prescription medicines. Also tell your prescriber or health care professional if you are a frequent user of drinks with caffeine or alcohol, if you smoke, or if you use illegal drugs. These may affect the way your medicine works. Check with your health care professional before stopping or starting any of your medicines.
What should I watch for while taking this medicine?
Visit your doctor or health care professional for regular checks on your progress. This medicine needs careful monitoring. Your doctor or health care professional may schedule regular blood tests.
Wear a medical ID bracelet or chain, and carry a card that describes your disease and details of your medicine and dosage times.
Do not change brands or dosage forms of this medicine without discussing the change with your doctor or health care professional.
You may get drowsy or dizzy. Do not drive, use machinery, or do anything that needs mental alertness until you know how this medicine affects you. Do not stand or sit up quickly, especially if you are an older patient. This reduces the risk of dizzy or fainting spells. Alcohol may interfere with the effect of this medicine. Avoid alcoholic drinks.
Birth control pills may not work properly while you are taking this medicine. Talk to your doctor about using an extra method of birth control.
This medicine can cause unusual growth of gum tissues. Visit your dentist regularly. Problems can arise if you need dental work, and in the day to day care of your teeth. Try to avoid damage to your teeth and gums when you brush or floss your teeth.
Do not take antacids at the same time as this medicine. If you get an upset stomach and want to take an antacid or medicine for diarrhea, make sure there is an interval of 2 to 3 hours before or after you took your phenytoin.
The use of this medicine may increase the chance of suicidal thoughts or actions. Pay special attention to how you are responding while on this medicine. Any worsening of mood, or thoughts of suicide or dying should be reported to your health care professional right away.
What side effects may I notice from this medicine?
Side effects that you should report to your prescriber or health care professional as soon as possible:
- allergic reactions like skin rash, itching or hives, swelling of the face, lips, or tongue
- breathing problems
- changes in vision
- chest pain or tightness
- dark yellow or brown urine
- fast or irregular heartbeat
- fever, sore throat
- loss of seizure control
- poor control of body movements or difficulty walking
- redness, blistering, peeling or loosening of the skin, including inside the mouth
- unusual bleeding or bruising, pinpoint red spots on skin
- worsening of mood, thoughts or actions of suicide or dying
- yellowing of the eyes or skin
Side effects that usually do not require medical attention (report to your prescriber or health care professional if they continue or are bothersome):
- difficulty sleeping
- excessive hair growth on the face or body
This list may not describe all possible side effects.
Where can I keep my medicine?
Keep out of the reach of children.
Store at room temperature below 30 degrees C (86 degrees F). Protect from light and moisture. Throw away any unused medicine after the expiration date.