Not Medical Advice: You can't inject Tizanidine. It comes as a tablet and a capsule to take by mouth.
Tizanidine belongs to the drug class skeletal muscle relaxants. It works by slowing action in the brain and nervous system to allow the muscles to relax.
Tizanidine is used to relieve the spasms and increased muscle tone caused by multiple sclerosis (MS), a disease in which the nerves do not function properly and patients may experience weakness, numbness, loss of muscle coordination and problems with vision, speech, and bladder control), stroke, or brain or spinal injury.
This medicine is usually taken consistently either always with or always without food two or three times a day. You must follow the directions on your prescription label carefully, and ask your doctor or pharmacist to explain any part you do not understand. Take tizanidine exactly as directed. Do not take more or less of it or take it more often than prescribed by your doctor.
According to MedlinePlus, Tizanidine capsules may be opened and sprinkled on soft foods such as applesauce. Talk to your doctor before opening the capsules because the effects of the medication when used in this manner may be different than when swallowing the capsule whole.
Check out Quick Tips for Taking Medications, shared by American Heart Association.