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Phenobarbital, a barbiturate, is used to control epilepsy (seizures) and as a sedative to relieve anxiety. It is also used for short-term treatment of insomnia to help you fall asleep. Phenobarbital is sometimes prescribed for other uses; ask your doctor or pharmacist for more information.
Phenobarbital comes as a tablet, capsule, and elixir (liquid) to take by mouth. You may obtain a specially marked measuring spoon from your pharmacist to be sure of an accurate dose of the liquid. It usually is taken one to three times a day and may be taken with or without food. If you take Phenobarbital once a day, take it at bedtime. Follow the directions on your prescription label carefully, and ask your doctor or pharmacist to explain any part you do not understand. Take Phenobarbital exactly as directed. If you are taking Phenobarbital to control convulsions or seizures, follow the exact schedule prescribed by your doctor. Phenobarbital can be habit-forming. Do not use Phenobarbital for more than 2 weeks if it is being used to help you sleep. Do not take a larger dose, take it more often, or for a longer time than your doctor tells you to. Tolerance may develop with long-term or excessive use, making the drug less effective. Phenobarbital must be taken regularly to be effective. Do not skip doses even if you feel that you do not need them. Call your doctor if you have convulsions or seizures while taking Phenobarbital. Do not stop taking this drug without talking to your doctor, especially if you have been taking it for a long time. Stopping the drug suddenly can cause withdrawal symptoms (anxiousness, sleeplessness, and irritability). Your doctor probably will decrease your dose gradually. |