Baclofen is a muscle relaxant and it relaxes certain muscles in the body. It is an antispastic agent that is used to treat multiple sclerosis, muscle spasms, muscle stiffness and pains. It is sometimes prescribed for people with spinal cord diseases. Though it does not cure the underlying condition, it does provide symptomatic relief and improvement in the condition. Baclofen works by acting on the central nervous system to produce the effects of relaxing the muscles. However, people with a history of epilepsy, blood clots, stroke, or kidney disease are not advised to use this medication. Side effects of this medication might include headaches, dizziness, low blood pressure, constipation, drowsiness, and sometimes hallucinations, mood swings and depression. In case of people with type 2 diabetes, baclofen has adverse drug interaction by raising the blood sugar levels.