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Phenobarbital is used to prevent seizures. It is also used to sedate patients (help them sleep during procedures) and to relieve anxiety. Phenobarbital is available as a 4 mg/ml reddish-orange liquid, and as white tablets in 15-mg, 30-mg, 60-mg, and 100-mg strengths. It is also available as a clear liquid given by vein (IV).
Symptoms of an allergic reaction include: rash, hives, itching, chills, fever, headache, muscle ache, shortness of breath, coughing, tightness in the throat, swelling of the face or neck.
Not all patients who take phenobarbital will experience these side effects. Common side effects are bolded, but there may be others. Please report all suspected side effects to your doctor or pharmacist.
Find more information on side effects.
These are the most common side effects, but there may be others. Please report all side effects to the doctor or nurse.
Be sure to discuss all questions and instructions with your doctor or pharmacist.