Along with its needing effects, a drug 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 family doctor as soon as possible if any of the following side effects was happen
Less common
Fainting; fast heartbeat; fever; hive-like swellings - large on face, eyelids, mouth, lips andtongue; mental depression; shortness of breath, troubled breathing, tightness in chest andwheezing; skin rash, hives, itching, or redness; slow heartbeat - methocarbamol injection only; stinging or burning of eyes; stuffy nose and red or bloodshot eyes
Rare
Blood in urine; bloody or black, tarry stools; convulsions - seizures - methocarbamol injection only; cough or hoarseness; fast or irregular breathing; lower back or side pain; muscle cramps or pain - not present before treat or more painful than before treat; painful or difficult urination; pain, tenderness, heat, redness, or swelling over a blood vessel - vein in arm or leg - methocarbamol injection only; pinpoint red spots on skin; puffiness or swelling of the eyelids or around the eyes; sores, ulcers, or white spots on lips or in mouth; sore throat and fever with or without chills; swollen andpainful glands; unusual bruising or bleeding; unusual tiredness or weakness; vomiting of blood or material that looks like coffee grounds; yellow eyes or skin
More common side effects may occur that usually do not need medical attention. These side effects may go away during treat as your body adjusts to the drug. However, check with your family doctor if any of the following side effects continue or are bothersome:
More common
Blurred or double vision or any change in vision; dizziness or lightheadedness; drowsiness
Less common or rare
Abdominal or stomach cramps or pain; clumsiness or unsteadiness; confusion; constipation; diarrhea; excitement, nervousness, restlessness, or irritability; flushing or redness of face; headache; heartburn; hiccups; muscle weakness; nausea or vomiting; pain or peeling of skin at place of injection - methocarbamol only; trembling; trouble in sleeping; uncontrolled movements of eyes - methocarbamol injection only
Although not all of the side effects listed above have been reported for all of these medication, they have been reported for at least one of them. However, since all of these skeletal muscle relaxants have similar effects, it is possible that any of the above side effects may occur with any of these medication.
In addition to the other side effects listed above, chlorzoxazone may cause your urine to turn orange or reddish purple. Methocarbamol may cause your urine to turn black, brown, or green. This effect is harmless and will go away when you stop taking the drug. However, if you have any questions about this, check with your family doctor.
More common side effects not listed above may also occur in some diseaseds. If you notice any other problems, check with your family doctor.