Label: METHOCARBAMOL tablet, film coated

Methocarbamol Tablets, USP, a carbamate derivative of guaifenesin, is a central nervous system (CNS) depressant with sedative and musculoskeletal relaxant properties.

The chemical name of methocarbamol is 3-(2-methoxyphenoxy)-1,2-propanediol 1-carbamate and has the empirical formula C11H15NO5. Its molecular weight is 241.24. The structural formula is shown below.

Methocarbamol is a white powder, sparingly soluble in water and chloroform, soluble in alcohol (only with heating) and propylene glycol, and insoluble in benzene and n-hexane.

Methocarbamol tablet USP, 500 mg is available as a white, round, scored, film-coated tablet, debossed “ASC” over the score on one side and “500” on the other side. Methocarbamol tablet USP, 750 mg is available as white, capsule-shaped, film-coated tablet, debossed “ASC” on one side and “750” on the other side.

Each tablet for oral administration contains 500 mg or 750 mg methocarbamol. Inactive ingredients include colloidal silicon dioxide, croscarmellose sodium, lecithin, magnesium stearate, microcrystalline cellulose, povidone, polyvinyl alcohol, polyethylene glycol, sodium lauryl sulfate, talc and titanium dioxide.

The mechanism of action of methocarbamol in humans has not been established, but may be due to general CNS depression. It has no direct action on the contractile mechanism of striated muscle, the motor end plate or the nerve fiber.

Methocarbamol is indicated as an adjunct to rest, physical therapy, and other measures for the relief of discomfort associated with acute, painful musculoskeletal conditions. The mode of action of methocarbamol has not been clearly identified, but may be related to its sedative properties. Methocarbamol does not directly relax tense skeletal muscles in man.

Methocarbamol is contraindicated in patients hypersensitive to methocarbamol or to any of the tablet components.

Since methocarbamol may possess a general CNS depressant effect, patients receiving methocarbamol should be cautioned about combined effects with alcohol and other CNS depressants.

Safe use of methocarbamol has not been established with regard to possible adverse effects upon fetal development. There have been reports of fetal and congenital abnormalities following in utero exposure to methocarbamol. Therefore, methocarbamol should not be used in women who are or may become pregnant and particularly during early pregnancy unless in the judgment of the physician the potential benefits outweigh the possible hazards (see PRECAUTION, Pregnancy).

Use in Activities Requiring Mental Alertness

Methocarbamol may impair mental and/or physical abilities required for performance of hazardous tasks, such as operating machinery or driving a motor vehicle. Patients should be cautioned about operating machinery, including automobiles, until they are reasonably certain that methocarbamol therapy does not adversely affect their ability to engage in such activities.

Adverse reactions reported coincident with the administration of methocarbamol include:

Body as a whole: Anaphylactic reaction, angioneurotic edema, fever, headache
Cardiovascular system: Bradycardia, flushing, hypotension, syncope, thrombophlebitis
Digestive system: Dyspepsia, jaundice (including cholestatic jaundice), nausea and vomiting
Hemic and lymphatic system: Leukopenia
Immune system: Hypersensitivity reactions
Nervous system: Amnesia, confusion, diplopia, dizziness or lightheadedness, drowsiness, insomnia, mild muscular incoordination, nystagmus, sedation, seizures (including grand mal), vertigo
Skin and special senses: Blurred vision, conjunctivitis, nasal congestion, metallic taste, pruritus, rash, urticaria

Limited information is available on the acute toxicity of methocarbamol. Overdose of methocarbamol is frequently in conjunction with alcohol or other CNS depressants and includes the following symptoms: nausea, drowsiness, blurred vision, hypotension, seizures, and coma.

In post-marketing experience, deaths have been reported with an overdose of methocarbamol alone or in the presence of other CNS depressants, alcohol or psychotropic drugs.

Treatment
Management of overdose includes symptomatic and supportive treatment. Supportive measures include maintenance of an adequate airway, monitoring urinary output and vital signs, and administration of intravenous fluids if necessary. The usefulness of hemodialysis in managing overdose is unknown.

Methocarbamol 500 mg – Adults:
Initial dosage: 3 tablets 4 times a day
Maintenance dosage: 2 tablets 4 times a day

750 mg – Adults:

Initial dosage: 2 tablets 4 times a day
Maintenance dosage: 1 tablet every 4 hours, or 2 tablets 3 times a day.

Six grams a day are recommended for the first 48 to 72 hours of treatment. (For severe conditions 8 grams a day may be administered.) Thereafter, the dosage can usually be reduced to approximately 4 grams a day.

Methocarbamol tablets, USP 500 mg are white, round, scored, film-coated tablets, debossed “ASC” over the score on one side and “500” on the other side. They are supplied as follows:

100 counts: NDC 71093-140-04
500 counts: NDC 71093-140-05

Methocarbamol tablets, USP 750 mg are white, capsule-shaped, film-coated tablets, debossed “ASC” on one side and 750 on the other. They are supplied as follows:

100 counts: NDC 71093-141-04
500 counts: NDC 71093-141-05

Store between 20°C and 25°C (68°F and 77°F) [see USP Controlled Room Temperature]. Dispense in a tight container.

Manufactured For:
DBL Pharmaceuticals, Inc.
Jackson Heights, NY 11372

For more information, call ACI Healthcare USA, Inc. at 1-888-802-1213.

Manufactured By:
Cohance Lifesciences LIMITED
Telangana - 500076, INDIA.

Distributed By:
ACI Healthcare USA, Inc.
10100 W. Sample Road, Suite 406
Coral Springs, FL 33065

Issued February 2023