Cyclobenzaprine is a medication used to manage pain from muscle injuries, sprains and strains, says MedlinePlus. It is a muscle relaxant that works on the neurotransmitters, or chemicals, in your brain so you perceive less pain. According to the National Library of Medicine, you will take 5 milligrams of cyclobenzaprine three times daily. Your doctor can increase the dosage to 10 mg three times a day if 5 mg is ineffective in treating your injuries.
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Common Side Effects
According to Drugs.com, cyclobenzaprine commonly causes blurry vision, drowsiness, a dry mouth, muscle weakness, a dry throat and poor appetite. It can also cause fatigue, dizziness, nausea, diarrhea, constipation and stomach pain. These side effects are not life threatening, but call your doctor if these symptoms last for four to five days.
Harmful Side Effects
Cyclobenzaprine can cause various harmful side effects. MedlinePlus says that it can cause chest pain, convulsions, seizures, trouble breathing and dysphagia (trouble swallowing). It can cause facial or tongue edema (swelling), a severe skin rash and an arrythmia (irregular heartbeat). Cyclobenzapirine's other critical effects include confusion, numbness on one side of the body, lack of coordination, hallucinations, light-headedness and fainting. It can cause a headache, unsteadiness, dark-colored urine and yellowing of your eyes or skin. These are urgent symptoms that require rapid medical attention.
Other Side Effects
According to the National Library of Medicine, cyclobenzaprine can cause tachycardia (a fast heartbeat), palpitations (a pounding heartbeat), flatulence (gas), thirst, depression, anxiety and depression. It can cause euphoria, diaphoresis (sweating), diplopia (double vision), tinnitus (ringing in the ears) and frequent urination.
You should avoid cyclobenzaprine if you are allergic to it. Cyclobenzaprine may provoke respiratory difficulties, swelling of your face or tongue, and hives.
Drugs.com recommends that you avoid cyclobenzaprine if you are taking a monoamine oxidase inhibitor such as phenelzine, trancycloprine or selegiline. These medications may combine with cyclobenzaprine and cause the aforementioned harmful side effects.
Inform you physician if you have congestive heart failure, hyperthyroidism (a condition in which your thyroid gland is overactive), an enlarged prostate, liver problems or glaucoma (a condition in which your eye pressures are increased). Cyclobenzaprine can worsen these conditions.
Drugs.com says that it is not known whether cyclobenzaprine contaminates breast milk or harms your baby during pregnancy. However, it is crucial to tell your physician if you are pregnant, nursing or plan to become pregnant.
You should not combine cyclobenzaprine with such drugs as atropine, glycopyrrolate, guanethidine, mepenzolate, tramadol, oxybutynin or dicyclomine. The combination can harm you and provoke the aforementioned effects.