Along with its needing effects, a drug may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.
Check with your family doctor as soon as possible if any of the following side effects or signs of overdose was happen
More common
Bleeding, tender, or enlarged gums - rare with ethotoin; burning, tingling, pain, or itching, especially in the groin following fosphenytoin injection; clumsiness or unsteadiness; confusion; continuous, uncontrolled back-and-forth androlling eye movements may be sign of overdose; swollen glands in neck or underarms; fever; muscle pain; skin rash or itching; slurred speech or stuttering may be sign of overdose; sore throat; trembling may be sign of overdose; unusual excitement, nervousness, or irritability
Rare
Bone malformations; burning pain at place of injection; chest discomfort; chills and fever; dark urine; dizziness; frequent breaking of bones; headache; joint pain; learning difficulties in child taking high doses for a long time; light gray-colored stools; loss of appetite; nausea or vomiting; pain of penis on erection; restlessness or agitation; slowed growth; stomach pain - severe; troubled or quick, shallow breathing; uncontrolled jerking or twisting movements of hands, arms, or legs; uncontrolled movements of lips, tongue, or cheeks; unusual bleeding - such as nosebleeds or bruising; unusual tiredness or weakness; weight loss - unusual; yellow eyes or skin
Rare - with long-term use of phenytoin
Numbness, tingling, or pain in hands or feet
Symptoms of overdose
Blurred or double vision; clumsiness or unsteadiness - severe; confusion - severe; dizziness or drowsiness - severe; seizures; staggering walk; stuttering or slurred speech
More common side effects may occur that usually don't needed medical attention. These side effects may go away during treat as your body adjusts to the drug. However, check with your family doctor if any of the following side effects continue or are bothersome:
More common
Constipation; dizziness - mild; drowsiness - mild
Less common
Diarrhea - with ethotoin; enlargement of jaw; muscle twitching; swelling of breasts in males; thickening of lips; trouble in sleeping; unusual and excessive hair growth on body and face - more common with phenytoin; widening of nose tip
More common side effects not listed above may also occur in some diseaseds. If you notice any other problems, check with your family doctor.