Phenobarbital is a prescription barbiturate medication used to treat certain types of epilepsy–a seizure disorder that affects the central nervous system. This medication may also be used to alleviate symptoms of insomnia, a sleeping disorder in some patients. Take this medication only as prescribed by your doctor, as use of phenobarbital can be habit-forming. Discuss the common side effects of phenobarbital with your pharmacist or doctor before you begin treatment with this medication.
Fatigue
Fatigue is the most common side effect of phenobarbital, warn health professionals at Epilepsy, an informational website for people affected by epilepsy. While taking this medication, you may find it more difficult to remain alert throughout the day. This side effect can negatively impact your ability to complete responsibilities associated with work or school. If you experience excessive tiredness or drowsiness while taking this medication, you may need to take frequent naps throughout the day or go to bed earlier than usual in order to maintain your energy levels. Speak with your doctor if side effects of tiredness or fatigue significantly interfere with your daily routine.
Stomach Upset
While taking phenobarbital, you can experience stomach upset as a side effect of treatment. Nausea or vomiting can be uncomfortable and may lead to a decrease in your usual appetite. Eating a small snack or meal before taking this medication can help prevent the emergence of stomach-related side effects.
Dizziness
You can begin to feel unusually lightheaded or dizzy while taking this medication, warns Drugs, an informational, peer-reviewed consumer drug website. During an episode of dizziness, remain seated until this sensation passes to prevent further complications from tripping or falling down. Lightheadedness or dizziness can also exacerbate stomach upset side effects in some patients.
Heartbeat or Breathing Irregularities
You can develop heartbeat or breathing irregularities while receiving treatment with phenobarbital, explain health officials at PDR Health, a medical information website established by the publishers of the Physicians’ Desktop Reference. Contact your doctor immediately if you notice that your heart or breathing rate is unusually slow or shallow. These side effects can also occur in conjunction with dizziness or fatigue in certain patients.
Mood or Behavioral Changes
Changes in mood or behavior can be observed in patients taking phenobarbital. Certain patients–especially children–may become unusually hyperactive or restless during treatment. You may notice that your child has difficulty falling asleep or cannot sit still in the classroom or at the dinner table. Both adults and children can experience decreased concentration or memory problems as a result of phenobarbital use. Certain patients can develop depression or a decreased sexual libido, which may impact relationships with intimate partners, family members, friends or colleagues. Talk with your doctor if you notice significant mood or behavior changes while you are taking phenobarbital.
