Get emergency medical help if you have signs of an allergic reaction: hives, mouth sores, skin rash with blistering and peeling; difficult breathing; swelling of your face, lips, tongue, or throat.
Report any new or worsening symptoms to your doctor, such as: mood or behavior changes, depression, anxiety, or if you feel agitated, hostile, restless, hyperactive (mentally or physically), or have thoughts about suicide or hurting yourself.
Call your doctor at once if you have:
unusual thoughts or behavior;
loss of balance or coordination;
fever, chills, sore throat;
easy bruising or bleeding; or
pale skin, unusual tiredness.
Common side effects may include:
dizziness, drowsiness, spinning sensation;
problems with balance or muscle movement;
nausea, vomiting, loss of appetite;
feeling tired or irritable;
blurred vision;
rash; or
impotence, sexual problems.
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.
 Primidone side effects (more detail)
