According to MedlinePlus, doctors prescribe cyclobenzaprine to relax muscles and relieve the pain and discomfort associated with sprains, strains and muscle injuries. Cyclobenzaprine, also known by the brand names Amrix or Flexeril, is classified as a muscle relaxant and is often combined with physical therapy and rest.
MedlinePlus recommends that patients provide their doctor with a list of their current medications and allergies before taking cyclobenzaprine. It is also important for patients to tell their doctor if they have heart disease, difficulty urinating, glaucoma or an overactive thyroid.
Cyclobenzaprine has several potential side effects, including dry mouth, dizziness, drowsiness and upset stomach. Consuming alcohol while taking cyclobenzaprine may increase drowsiness. Patients are advised against operating a vehicle or heavy machinery until they know how cyclobenzaprine affects them.
Cyclobenzaprine sometimes causes serious side effects that warrant an immediate call to the doctor. These include severe skin rash, face or tongue swelling, problems breathing or swallowing, irregular heart rate, chest pain, fever and seizures. Patients are advised against taking this medication for more than three weeks unless directed by their doctor.