Cyclobenzaprine hydrochloride tablet, film coated


Cyclobenzaprine hydrochloride is a white, crystalline tricyclic amine salt with the empirical formula C 20H 21N HCl and a molecular weight of 311.9. It has a melting point of 217C and a pKa of 8.47 at 25C. It is freely soluble in water and alcohol, sparingly soluble in isopropanol, and insoluble in hydrocarbon solvents. If aqueous solutions are made alkaline, the free base separates.

Cyclobenzaprine hydrochloride is designated chemically as 3-(5H-dibenzo [a,d] cyclohepten-5-ylidene)-N,N-dimethyl-1-propanamine hydrochloride, and has the following structural formula:

chemical structure

Each 5 mg Cyclobenzaprine hydrochloride tablet for oral administration contains 5 mg Cyclobenzaprine hydrochloride.

Each 10 mg Cyclobenzaprine hydrochloride tablet for oral administration contains 10 mg Cyclobenzaprine hydrochloride.

Each tablet contains the following inactive ingredients: lactose monohydrate, microcrystalline cellulose, croscarmellose sodium, silicon dioxide, magnesium stearate, carnauba wax, titanium dioxide, polyethylene glycol, and iron oxide yellow.

In addition, 5 mg tablets also contain polyvinyl alcohol, talc, lecithin, and FD&C yellow # 6 / sunset yellow FCF aluminum lake.

In addition, 10 mg tablets also contain D&C yellow # 10 aluminum lake, FD&C yellow # 6 aluminum lake and hypromellose.

Clinical pharmacology

Cyclobenzaprine hydrochloride relieves skeletal muscle spasm of local origin without interfering with muscle function. It is ineffective in muscle spasm due to central nervous system disease.

Cyclobenzaprine reduced or abolished skeletal muscle hyperactivity in several animal models. Animal studies indicate that cyclobenzaprine does not act at the neuromuscular junction or directly on skeletal muscle. Such studies show that cyclobenzaprine acts primarily within the central nervous system at brain stem as opposed to spinal cord levels, although its action on the latter may contribute to its overall skeletal muscle relaxant activity. Evidence suggests that the net effect of cyclobenzaprine is a reduction of tonic somatic motor activity, influencing both gamma () and alpha () motor systems.

Pharmacological studies in animals showed a similarity between the effects of cyclobenzaprine and the structurally related tricyclic antidepressants, including reserpine antagonism, norepinephrine potentiation, potent peripheral and central anticholinergic effects, and sedation. Cyclobenzaprine caused slight to moderate increase in heart rate in animals.

Clinical studies

Eight double-blind controlled clinical studies were performed in 642 patients comparing Cyclobenzaprine hydrochloride tablets, USP 10 mg, diazepam**, and placebo. Muscle spasm, local pain and tenderness, limitation of motion, and restriction in activities of daily living were evaluated. In three of these studies there was a significantly greater improvement with Cyclobenzaprine hydrochloride tablets, USP than with diazepam, while in the other studies the improvement following both treatments was comparable.

Although the frequency and severity of adverse reactions observed in patients treated with Cyclobenzaprine hydrochloride tablets, USP were comparable to those observed in patients treated with diazepam, dry mouth was observed more frequently in patients treated with Cyclobenzaprine hydrochloride tablets, USP and dizziness more frequently in those treated with diazepam. The incidence of drowsiness, the most frequent adverse reaction, was similar with both drugs.

The efficacy of Cyclobenzaprine hydrochloride tablets, USP 5 mg was demonstrated in two seven-day, double-blind, controlled clinical trials enrolling 1405 patients. One study compared Cyclobenzaprine hydrochloride tablets, USP 5 and 10 mg t.i.d. to placebo; and a second study compared Cyclobenzaprine hydrochloride tablets, USP 5 and 2.5 mg t.i.d. to placebo. Primary endpoints for both trials were determined by patient-generated data and included global impression of change, medication helpfulness, and relief from starting backache. Each endpoint consisted of a score on a 5-point rating scale (from 0 or worst outcome to 4 or best outcome). Secondary endpoints included a physicians evaluation of the presence and extent of palpable muscle spasm.

Comparisons of Cyclobenzaprine hydrochloride tablets, USP 5 mg and placebo groups in both trials established the statistically significant superiority of the 5 mg dose for all three primary endpoints at day 8 and, in the study comparing 5 and 10 mg, at day 3 or 4 as well. A similar effect was observed with Cyclobenzaprine hydrochloride tablets, USP 10 mg (all endpoints). Physician-assessed secondary endpoints also showed that Cyclobenzaprine hydrochloride tablets, USP 5 mg were associated with a greater reduction in palpable muscle spasm than placebo.

Analysis of the data from controlled studies shows that Cyclobenzaprine hydrochloride tablets, USP produce clinical improvement whether or not sedation occurs.

**VALIUM® (diazepam, Roche)

Surveillance Program

A post-marketing surveillance program was carried out in 7607 patients with acute musculoskeletal disorders, and included 297 patients treated with Cyclobenzaprine hydrochloride tablets, USP 10 mg for 30 days or longer. The overall effectiveness of Cyclobenzaprine hydrochloride tablets, USP was similar to that observed in the double-blind controlled studies; the overall incidence of adverse effects was less (see ADVERSE REACTIONS).

Indications and usage

Cyclobenzaprine hydrochloride tablets, USP is indicated as an adjunct to rest and physical therapy for relief of muscle spasm associated with acute, painful musculoskeletal conditions.

Improvement is manifested by relief of muscle spasm and its associated signs and symptoms, namely, pain, tenderness, limitation of motion, and restriction in activities of daily living.

Cyclobenzaprine hydrochloride tablets, USP should be used only for short periods (up to two or three weeks) because adequate evidence of effectiveness for more prolonged use is not available and because muscle spasm associated with acute, painful musculoskeletal conditions is generally of short duration and specific therapy for longer periods is seldom warranted.

Cyclobenzaprine hydrochloride tablets, USP have not been found effective in the treatment of spasticity associated with cerebral or spinal cord disease, or in children with cerebral palsy.


Hypersensitivity to any component of this product.

Concomitant use of monoamine oxidase (MAO) inhibitors or within 14 days after their discontinuation. Hyperpyretic crisis seizures and deaths have occurred in patients receiving cyclobenzaprine (or structurally similar tricyclic antidepressants) concomitantly with MAO inhibitor drugs.

Acute recovery phase of myocardial infarction, and patients with arrhythmias, heart block or conduction disturbances, or congestive heart failure.



Serotonin Syndrome

The development of a potentially life-threatening serotonin syndrome has been reported with Cyclobenzaprine Hydrochloride when used in combination with other drugs, such as selective serotonin reuptake inhibitors (SSRIs), serotonin norepinephrine reuptake inhibitors (SNRIs), tricyclic antidepressants (TCAs), tramadol, bupropion, meperidine, verapamil, or (MAO) inhibitors. The concomitant use of Cyclobenzaprine Hydrochloride with MAO inhibitors is contraindicated (see CONTRAINDICATIONS). Serotonin syndrome symptoms may include mental status changes (e.g., confusion, agitation, hallucinations), autonomic instability (e.g., diaphoresis, tachycardia, labile blood pressure, hyperthermia), neuromuscular abnormalities (e.g., tremor, ataxia, hyperreflexia, clonus, muscle rigidity), and/or gastrointestinal symptoms (e.g., nausea, vomiting, diarrhea). Treatment with Cyclobenzaprine Hydrochloride and any concomitant serotonergic agents should be discontinued immediately if the above reactions occur and supportive symptomatic treatment should be initiated. If concomitant treatment with Cyclobenzaprine Hydrochloride and other serotonergic drugs is clinically warranted, careful observation is advised, particularly during treatment initiation or dose increases (see PRECAUTIONS, Drug Interactions).

Cyclobenzaprine is closely related to the tricyclic antidepressants, e.g., amitriptyline and imipramine. In short term studies for indications other than muscle spasm associated with acute musculoskeletal conditions, and usually at doses somewhat greater than those recommended for skeletal muscle spasm, some of the more serious central nervous system reactions noted with the tricyclic antidepressants have occurred (see WARNINGS, below, and ADVERSE REACTIONS).

Tricyclic antidepressants have been reported to produce arrhythmias, sinus tachycardia, prolongation of the conduction time leading to myocardial infarction and stroke.

Cyclobenzaprine hydrochloride tablets, USP may enhance the effects of alcohol, barbiturates, and other CNS depressants.


Adverse reactions

Incidence of most common adverse reactions in the 2 double-blind, placebo-controlled 5 mg studies (incidence of > 3% on Cyclobenzaprine hydrochloride tablets, USP 5 mg):

Cyclobenzaprinehydrochloride tablets, USP Cyclobenzaprinehydrochloride tablets, USP
5 mg 10 mg Placebo
N=464 N=249 N=469
Drowsiness 29% 38% 10%
Dry Mouth 21% 32% 7%
Fatigue 6% 6% 3%
Headache 5% 5% 8%

Adverse reactions which were reported in 1% to 3% of the patients were: abdominal pain, acid regurgitation, constipation, diarrhea, dizziness, nausea, irritability, mental acuity decreased, nervousness, upper respiratory infection, and pharyngitis.

The following list of adverse reactions is based on the experience in 473 patients treated with Cyclobenzaprine hydrochloride tablets, USP 10 mg in additional controlled clinical studies, 7607 patients in the post-marketing surveillance program, and reports received since the drug was marketed. The overall incidence of adverse reactions among patients in the surveillance program was less than the incidence in the controlled clinical studies.

The adverse reactions reported most frequently with Cyclobenzaprine hydrochloride tablets, USP were drowsiness, dry mouth and dizziness. The incidence of these common adverse reactions was lower in the surveillance program than in the controlled clinical studies:

Note: Cyclobenzaprine hydrochloride tablets, USP 10 mg data are from one clinical trial. Cyclobenzaprine hydrochloride tablets, USP 5 mg and placebo data are from two studies .

Clinical Studies With Cyclobenzaprinehydrochloride tablets, USP 10 mg Surveillance Program WithCyclobenzaprine hydrochloride tablets,USP 10 mg
Drowsiness 39% 16%
Dry Mouth 27% 7%
Dizziness 11% 3%

Among the less frequent adverse reactions, there was no appreciable difference in incidence in controlled clinical studies or in the surveillance program. Adverse reactions which were reported in 1% to 3% of the patients were: fatigue/tiredness, asthenia, nausea, constipation, dyspepsia, unpleasant taste, blurred vision, headache, nervousness, and confusion.

The following adverse reactions have been reported in post-marketing experience or with an incidence of less than 1% of patients in clinical trials with the 10 mg tablet:

Body as a Whole:Syncope; malaise.

Cardiovascular:Tachycardia; arrhythmia; vasodilatation; palpitation; hypotension.

Digestive:Vomiting; anorexia; diarrhea; gastrointestinal pain; gastritis; thirst; flatulence; edema of the tongue; abnormal liver function and rare reports of hepatitis, jaundice and cholestasis.

Hypersensitivity:Anaphylaxis; angioedema; pruritus; facial edema; urticaria; rash.

Musculoskeletal:Local weakness.

Nervous System and Psychiatric:Seizures, ataxia; vertigo; dysarthria; tremors; hypertonia; convulsions; muscle twitching; disorientation; insomnia; depressed mood; abnormal sensations; anxiety; agitation; psychosis, abnormal thinking and dreaming; hallucinations; excitement; paresthesia; diplopia, serotonin syndrome.


Special Senses:Ageusia; tinnitus.

Urogenital:Urinary frequency and/or retention.

Causal Relationship Unknown

Other reactions, reported rarely for Cyclobenzaprine hydrochloride tablets, USP under circumstances where a causal relationship could not be established or reported for other tricyclic drugs, are listed to serve as alerting information to physicians:

Body as a whole:Chest pain; edema.

Cardiovascular:Hypertension; myocardial infarction; heart block; stroke.

Digestive:Paralytic ileus, tongue discoloration; stomatitis; parotid swelling.

Endocrine:Inappropriate ADH syndrome.

Hematic and Lymphatic:Purpura; bone marrow depression; leukopenia; eosinophilia; thrombocytopenia.

Metabolic, Nutritional and Immune:Elevation and lowering of blood sugar levels; weight gain or loss.


Nervous System and Psychiatric:Decreased or increased libido; abnormal gait; delusions; aggressive behavior; paranoia; peripheral neuropathy; Bells palsy; alteration in EEG patterns; extrapyramidal symptoms.


Skin:Photosensitization; alopecia.

Urogenital:Impaired urination; dilatation of urinary tract; impotence; testicular swelling; gynecomastia; breast enlargement; galactorrhea.

Drug abuse and dependence

Pharmacologic similarities among the tricyclic drugs require that certain withdrawal symptoms be considered when Cyclobenzaprine hydrochloride tablets, USP are administered, even though they have not been reported to occur with this drug. Abrupt cessation of treatment after prolonged administration rarely may produce nausea, headache, and malaise. These are not indicative of addiction.


Although rare, deaths may occur from overdosage with Cyclobenzaprine hydrochloride tablets, USP. Multiple drug ingestion (including alcohol) is common in deliberate cyclobenzaprine overdose. As management of overdose is complex and changing, it is recommended that the physician contact a poison control center for current information on treatment. Signs and symptoms of toxicity may develop rapidly after cyclobenzaprine overdose; therefore, hospital monitoring is required as soon as possible. The acute oral LD50 of Cyclobenzaprine hydrochloride tablets, USP is approximately 338 and 425 mg/kg in mice and rats, respectively.


The most common effects associated with cyclobenzaprine overdose are drowsiness and tachycardia. Less frequent manifestations include tremor, agitation, coma, ataxia, hypertension, slurred speech, confusion, dizziness, nausea, vomiting, and hallucinations. Rare but potentially critical manifestations of overdose are cardiac arrest, chest pain, cardiac dysrhythmias, severe hypotension, seizures, and neuroleptic malignant syndrome. Changes in the electrocardiogram, particularly in QRS axis or width, are clinically significant indicators of cyclobenzaprine toxicity. Other potential effects of overdosage include any of the symptoms listed under ADVERSE REACTIONS.

Dosage and administration

For most patients, the recommended dose of Cyclobenzaprine hydrochloride tablets, USP is 5 mg three times a day. Based on individual patient response, the dose may be increased to 10 mg three times a day. Use of Cyclobenzaprine hydrochloride tablets, USP for periods longer than two or three weeks is not recommended. (see INDICATIONS AND USAGE).

Less frequent dosing should be considered for hepatically impaired or elderly patients (see PRECAUTIONS, Impaired Hepatic Function, and PRECAUTIONS Use in the Elderly).

How supplied

Product: 50090-2761

NDC: 50090-2761-0 30 TABLET, FILM COATED in a BOTTLE

NDC: 50090-2761-1 20 TABLET, FILM COATED in a BOTTLE

NDC: 50090-2761-2 90 TABLET, FILM COATED in a BOTTLE

Ingredients and appearance - Product information

Cyclobenzaprine hydrochloride tablet, film coated- Cyclobenzaprine hydrochloride

Product information

Product Type HUMAN PRESCRIPTION DRUG LABEL Item Code (Source) NDC: 50090-2761
Route of Administration Oral

Active Ingredient/Active Moiety

Ingredient Name Strength
Cyclobenzaprine hydrochloride ( UNII: 0VE05JYS2P)( Cyclobenzaprine - UNII: 69O5WQQ5TI ) 5 mgin 1

Inactive Ingredients

Ingredient Name Code
Lactose monohydrate ( UNII: EWQ57Q8I5X)
Microcrystalline cellulose ( UNII: OP1R32D61U)
Croscarmellose sodium ( UNII: M28OL1HH48)
Silicon dioxide ( UNII: ETJ7Z6XBU4)
Magnesium stearate ( UNII: 70097M6I30)
Carnauba wax ( UNII: R12CBM0EIZ)
Titanium dioxide ( UNII: 15FIX9V2JP)
Polyethylene glycol, unspecified ( UNII: 3WJQ0SDW1A)
Ferric oxide yellow ( UNII: EX438O2MRT)
Polyvinyl alcohol, unspecified ( UNII: 532B59J990)
Talc ( UNII: 7SEV7J4R1U)
Lecithin, soybean ( UNII: 1DI56QDM62)
Fd&c yellow no. 6 ( UNII: H77VEI93A8)

Product Characteristics

Color ORANGE Imprint Code K;6
Shape ROUND Size 8 mm
Score 1


# Item Code Package Description Marketing Start Date
1 NDC: 50090-2761-0 30 in 1 BOTTLE 2017/01/16
2 NDC: 50090-2761-1 20 in 1 BOTTLE 2017/01/05
3 NDC: 50090-2761-2 90 in 1 BOTTLE 2017/03/02

Marketing Information

Marketing Category Application Number or Monograph Citation Territorial Authority Marketing Start Date
ANDA ANDA078048 USA 2017/03/02

Labeler - A-S Medication Solutions( 830016429)


Name ID/FEI Business Operations
A-S Medication Solutions 830016429 RELABEL( 50090-2761), REPACK( 50090-2761)

Cyclobenzaprine hydrochloride