Robaxin Side Effects

The following adverse reactions have been reported coincident with the administration of methocarbamol. Some events may have been due to an overly rapid rate of intravenous injection.

Body as a whole: Anaphylactic reaction, angioneurotic edema, fever, headache

Cardiovascular system: Bradycardia, flushing, hypotension, syncope, thrombophlebitis

In most cases of syncope there was spontaneous recovery. In others, epinephrine, injectable steroids, and/or injectable antihistamines were employed to hasten recovery.

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 light-headedness, drowsiness, insomnia, mild muscular incoordination, nystagmus, sedation, seizures (including grand mal), vertigo

The onset of convulsive seizures during intravenous administration of methocarbamol has been reported in patients with seizure disorders. The psychic trauma of the procedure may have been a contributing factor. Although several observers have reported success in terminating epileptiform seizures with ROBAXIN Injectable, its administration to patients with epilepsy is not recommended (see PRECAUTIONSGeneral).

Skin and special senses: Blurred vision, conjunctivitis, nasal congestion, metallic taste, pruritus, rash, urticaria

Other: Pain and sloughing at the site of injection

Drowsiness, dizziness, lightheadedness, stomach upset, nausea/vomiting, or blurred vision may occur. If any of these effects persist or worsen, tell your doctor or pharmacist promptly.

Remember that your doctor has prescribed this medication because he or she has judged that the benefit to you is greater than the risk of side effects. Many people using this medication do not have serious side effects.

Tell your doctor right away if you have any serious side effects, including: fainting, slow heartbeat, yellowing eyes/skin, persistent nausea/vomiting, mental/mood changes (such as confusion, forgetfulness).

A very serious allergic reaction to this drug is rare. However, get medical help right away if you notice any symptoms of a serious allergic reaction, including: rash, itching/swelling (especially of the face/tongue/throat), severe dizziness, trouble breathing.

This is not a complete list of possible side effects. If you notice other effects not listed above, contact your doctor or pharmacist.

In the US – Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088 or at

In Canada – Call your doctor for medical advice about side effects. You may report side effects to Health Canada at 1-866-234-2345.

Robaxin Side Effects

For the Consumer

Side effects requiring immediate medical attention

Along with its needed effects, methocarbamol (the active ingredient contained in Robaxin) may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.

Check with your doctor immediately if any of the following side effects occur while taking methocarbamol:

Incidence not known

      • Black, tarry stools
      • changes in skin color
      • chest pain or discomfort
      • chills
      • clay-colored stools
      • cough
      • dark urine
      • diarrhea
      • difficulty in swallowing
      • dizziness
      • fast heartbeat
      • feeling of warmth
      • fever
      • headache
      • joint or muscle pain
      • large, hive-like swelling on the face, eyelids, lips, tongue, throat, hands, legs, feet, or sex organs
      • lightheadedness, dizziness, or fainting
      • loss of appetite
      • loss of bladder control
      • loss or problems with memory
      • nausea
      • numbness or tingling of face, hands, or feet
      • pain, tenderness, or swelling of foot or leg
      • painful or difficult urination
      • puffiness or swelling of the eyelids or around the eyes, face, lips, or tongue
      • redness and soreness of the eyes
      • redness of the face, neck, arms, and occasionally, upper chest
      • skin rash
      • sleepiness
      • slow or irregular heartbeat
      • sore throat
      • sores, ulcers, or white spots on the lips or in the mouth
      • stomach pain
      • sweating
      • swollen glands
      • tightness in the chest
      • total body jerking
      • unpleasant breath odor
      • unusual bleeding or bruising
      • unusual tiredness or weakness
      • vomiting of blood
      • yellow eyes or skin

Get emergency help immediately if any of the following symptoms of overdose occur while taking methocarbamol:

Symptoms of Overdose

      • Loss of consciousness
      • shaking or jerking of one area or side of the body

Side effects not requiring immediate medical attention

Some side effects of methocarbamol may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects.

Check with your health care professional if any of the following side effects continue or are bothersome or if you have any questions about them:

Incidence not known

      • Belching
      • double vision
      • drowsiness
      • feeling of constant movement of self or surroundings
      • heartburn
      • indigestion
      • mood or mental changes
      • sensation of spinning
      • stomach discomfort, upset, or pain
      • trouble sleeping
      • uncontrolled eye movements

Undesirable effects

Adverse reactions reported coincident with the administration of methocarbamol include

Body as a whole: Angioneurotic oedema, anaphylactic reaction, fever, headache.

Cardiovascular system: Bradycardia, flushing, hypotension, syncope.

Digestive system: Dyspepsia, jaundice (including cholestatic jaundice), nausea and vomiting.

Blood and lymphatic system: Leucopenia.

Nervous system: Restlessness, anxiety, tremor, amnesia, confusion, diplopia, dizziness or light-headedness, vertigo, drowsiness, insomnia, mild muscular incoordination, nystagmus, seizures (including grand mal).

Skin and special senses: Blurred vision, conjunctivitis with nasal congestion, metallic taste, pruritus, rash, urticaria.

Reporting of suspected adverse reactions

Reporting suspected adverse reactions after authorisation of the medicinal product is important. It allows continued monitoring of the benefit/risk balance of the medicinal product. Healthcare professionals are asked to report any suspected adverse reactions via the Yellow Card Scheme, Website: