Get emergency medical help if you have signs of an allergic reaction (hives, difficult breathing, swelling in your face or throat) or a severe skin reaction (fever, sore throat, burning in your eyes, skin pain, red or purple skin rash that spreads and causes blistering and peeling).
Seek medical treatment if you have a serious drug reaction that can affect many parts of your body. Symptoms may include: skin rash, fever, swollen glands, muscle aches, severe weakness, unusual bruising, or yellowing of your skin or eyes.
A phenytoin injection may cause life-threatening heart problems. Tell your caregiver if you feel weak, light-headed, or short of breath during or after an injection.
Phenytoin may cause serious side effects. Call your doctor at once if you have:
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a light-headed feeling, like you might pass out;
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confusion, unusual thoughts or behavior;
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fever, chills, sore throat, swollen glands;
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red or swollen gums, mouth sores;
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easy bruising, unusual bleeding;
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pain, swelling, bruising, or other irritation where the injection was given;
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purple discoloration of your skin around the IV needle, or spreading away from where the medicine was injected (may occur several days after an injection);
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increased thirst, increased urination; or
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liver problems--loss of appetite, upper stomach pain, dark urine, clay-colored stools, jaundice (yellowing of the skin or eyes).
Common side effects of phenytoin may include:
This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.
See more: Phenytoin (injection) Side Effects