Fenobarb 200mg Injection belongs to a class of medicines called barbiturates. It is used to treat and prevent epilepsy (seizures). They also have hypnotic properties. This means, they slow down the activity of the brain and can make you feel sleepy or dizzy. Fenobarb 200mg Injection is administered at a hospital or a clinical setting under the supervision of a doctor or a nurse. Get the injection regularly to maintain a consistent level of medicine in the body. Continue getting the injection, and do not stop it until the doctor says it is okay to stop. Some common side effects of this medicine include nausea, diarrhea, hyperactivity, depression, confusion, decreased blood pressure, and fatigue. It may also cause dizziness and sleepiness, so do not drive or do anything that requires mental focus until you know how this medicine affects you. Remember to consult your doctor if you notice severe rashes, especially accompanied by fever after taking this medicine. It should be noted that long-term use of this medicine can cause pain in joints.