Follow all directions on your prescription label. Do not take this medicine in larger or smaller amounts or for longer than recommended.
Phenobarbital may be habit-forming. Never share phenobarbital with another person, especially someone with a history of drug abuse or addiction. Keep the medication in a place where others cannot get to it. Selling or giving away this medicine is against the law.
Do not change your phenobarbital dose without your doctor's advice. Tell your doctor if the medicine does not seem to work as well in treating your condition.
If you are taking phenobarbital to treat seizures, keep taking the medicine even if you feel fine.
Do not stop using suddenly after long-term use, or you could have unpleasant withdrawal symptoms. Ask your doctor how to safely stop using phenobarbital.
Store at room temperature away from moisture, heat, and light.
Keep track of the amount of medicine used from each new bottle. Phenobarbital is a drug of abuse and you should be aware if anyone is using your medicine improperly or without a prescription.
 Detailed Phenobarbital dosage information
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What happens if I miss a dose?
Take the missed dose as soon as you remember. Skip the missed dose if it is almost time for your next scheduled dose. Do not take extra medicine to make up the missed dose.
What happens if I overdose?
Seek emergency medical attention or call the Poison Help line at 1-800-222-1222. An overdose of phenobarbital can be fatal.
Overdose symptoms may include slow or shallow breathing, weak pulse, cold or clammy skin, little or no urination, pinpoint pupils, feeling cold, or fainting.
