Methocarbamol (Injection Route)

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Side Effects

Along with its needed effects, a medicine 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:

• Abdominal or stomach pain
• Black, tarry stools
• Blurred vision
• Changes in skin color, pain, tenderness, or swelling of foot or leg
• Chest pain or discomfort
• Chills
• Clay-colored stools
• Confusion
• Convulsions
• Cough
• Dark urine
• Difficulty swallowing
• Dizziness, faintness, or lightheadedness when getting up from a lying or sitting position suddenly
• Drowsiness
• Fast heartbeat
• Fever
• Headache
• Hives
• Itching
• Large, hive-like swelling on face, eyelids, lips, tongue, throat, hands, legs, feet, or sex organs
• Lightheadedness, dizziness, or fainting
• Loss of appetite
• Loss of bladder control
• Loss of memory
• Muscle spasm or jerking of all extremities
• Nausea
• Painful or difficult urination
• Problems with memory
• Puffiness or swelling of the eyelids or around the eyes, face, lips, or tongue
• Relaxed and calm
• Shortness of breath
• Skin rash
• Sleepiness
• Slow or irregular heartbeat
• Sore throat
• Sores, ulcers, or white spots on lips or in mouth
• Sudden loss of consciousness
• Sweating
• Swollen glands
• Tightness in chest
• Unpleasant breath odor
• Unusual bleeding or bruising
• Unusual tiredness or weakness
• Vomiting of blood
• Wheezing
• Yellow eyes or skin

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

• Change in consciousness
• Loss of consciousness

Some side effects 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:

• Acid or sour stomach
• Belching
• Bleeding, blistering, burning, coldness, discoloration of skin, feeling of pressure, hives, infection, inflammation, itching, lumps, numbness, pain, rash, redness, scarring, soreness, stinging, swelling, tenderness, tingling, ulceration, or warmth at site
• Burning, dry, or itching eyes
• Discharge, excessive tearing
• Double vision
• Feeling of constant movement of self or surroundings
• Feeling of warmth
• Heartburn
• Indigestion
• Metallic taste
• Redness of the face, neck, arms, and occasionally, upper chest
• Redness, pain, or swelling of eye, eyelid, or inner lining of eyelid
• Seeing double
• Sensation of spinning
• Sleeplessness
• Stuffy nose
• Trouble sleeping
• Unable to sleep
• Uncontrolled eye movements
• Vomiting

Other side effects not listed may also occur in some patients. If you notice any other effects, check with your healthcare professional.

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

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