The lay of the land

Cyclobenzaprine, the active ingredient.

Therapeutic use: a centrally acting muscle relaxant prescribed for short term relief of acute musculoskeletal spasm accompanied by pain.

Common dosage forms internationally include immediate release 5 mg and per tablet 10 mg and extended release 15 mg and 30 mg formulations. This page refers to 15 mg where noted.

Cyclobenzaprine is normally combined with rest and physical therapy to help reduce painful muscle tightness after sprain, strain or other injury. For cautionary safety notes, see the sections on precautions and clear contraclues that suggest to therapy.

The Core Idea of How It Works

Cyclobenzaprine alters activity in the central nervous system to reduce tonic somatic motor activity and decrease muscle hyperactivity. It does not act directly on skeletal muscle fibers but influences the neural signals that cause involuntary muscle tightness.

Dose Information and Directions

Observe the prescriber's instructions exactly as directed. Cyclobenzaprine is generally intended for brief courses, commonly two to three weeks, and only while other measures are being used.

If symptoms have not improved after a short treatment period, arrange a review with the prescribing clinician to reassess need for continued therapy.

Risk mitigation steps

Not recommended in these scenarios

Possible adverse impact on health

Seek emergency care for signs of an allergic reaction such as hives, swelling of the face, lips, tongue or throat, or difficulty breathing.

Stop treatment and obtain urgent medical assessment if you experience chest pain, fast or irregular heartbeat, sudden weakness or numbness, trouble speaking, or loss of coordination.

Serotonin syndrome is a serious risk when cyclobenzaprine is combined with serotonergic agents. Symptoms include agitation, hallucinations, high temperature, sweating, tremor, muscle rigidity, fast pulse, and nausea or vomiting. If these occur, get urgent medical help.

More common, less severe reactions include drowsiness, fatigue, disabling headache, dizziness, dry mouth, nausea and constipation.

Potential Interpersonal engagements Between Drugs

Cyclobenzaprine may increase sedation from other central nervous system depressants. Discuss all current medicines with your prescriber before starting this drug.

Untaken dose

If you forget to take one dose, take it immediately after you remember, unless the next dose is imminent. In that case skip the the medication dose was missed and continue with the regular schedule. Do not replace a the medication dose was missed by doubling it.

Overdose tragedy

Excessive drug intake related signs can include extreme drowsiness, vomiting, rapid or irregular heartbeat, tremor, agitation or hallucinations. An overdose event poses a life threatening risk. Contact emergency services or your local poison information line immediately.

Storage facility

Alternate options and Related Pharmaceuticals

Depending on the clinical situation and availability in Australia, prescribers may consider:

Non-drug approaches such as rest, heat or cold, graded exercise and physiotherapy are important first-line options and often reduce the need for medicines.

Scan the rates and prices section for a rough cost comparison along with the legal entitlement to access section for availability pathways throughout Australia.

Australian prices expressed in AUD

Costs depend on supplier, pack size and whether the medicine is subsidised under the Pharmaceutical Benefits Scheme (PBS). The figures below are indicative and for guidance only.

Your actual out of pocket cost will vary by pharmacy, location, insurance and PBS eligibility. Always request a current price from your pharmacist or supplier before purchase.

Quick Facts

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