An intrathecal pump is a medical device used to deliver very small quantities of medications directly to the spinal fluid of a human being. Medications such as baclofen, morphine, or ziconotide may be delivered in this manner to minimize the side effects often associated with the higher dosages commonly found in oral medications of the same type. People with spastic diplegia or other forms of spasticity, or people in intolerable pain and nociception, who cannot tolerate side effects of the higher-dose oral medications of the same medication type, are potential candidates for that medication being administered via an intrathecal pump. In about 5% of patients, the intrathecal baclofen route has no effect on the nervous system.