Normally, your muscles get electrical signals from your nerves that tell them when to tense and relax. Spasticity happens when these signals become uneven, usually because the nerves have been damaged. This makes muscles tense up or move when you don’t want them to. Baclofen works by restoring the normal signals. It can help you move your muscles more normally.
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You can take baclofen as a pill or get it directly into an area of your spine called the intrathecal space. This part of your body is filled with the fluid that surrounds your spinal cord and nerve roots.
This type of treatment, called intrathecal baclofen (ITB), can help people who have a hard time with side effects of the pill form. It delivers the drug right to the spinal cord, so it doesn’t circulate throughout the body first. You need only tiny doses for the drug to work. This keeps side effects to a minimum.
What Is the Intrathecal Baclofen Pump System?
Doctors use a pump system to deliver baclofen directly into the spinal fluid. It’s made of a catheter (a small, flexible tube) and a pump. A surgeon puts the device -- a round metal disc, about 1 inch thick and 3 inches around -- under the skin of your belly near your waistline.
The pump stores and releases the right amount of medicine through the catheter. A tiny motor moves the medication from the pump through the catheter. Your treatment team can use a small computer outside your body to send messages to the pump and make adjustments in the dose, rate, and timing of the medication. You can also turn the system off when you don’t need it.
People with the pump must go back to their doctor's office for pump refills and medication adjustments, typically every 1 to 3 months. At the end of the battery's life span (usually 5 to 7 years), your doctor will remove and replace the system.