Robaxin Injection

1 What is Robaxin Injection?

Brand: Robaxin

Generic: Methocarbamol (Injection Route)

Brand name:


Methocarbamol is a muscle relaxant. It is used in the treatment of discomfort caused by acute painful muscle or bone condition along with rest, physical therapy, or other measures.

It may also be helpful in prolong contraction of muscles caused by tetanus.

It works by blocking nerve impulses (or pain sensations) that are sent to your brain.

It is available in the form of solution, only with your doctor’s prescription.

2 What to Know Before Using

Before starting the treatment your doctor should be informed about condition such as,


Inform your doctor if you are allergic to any food, preservatives, dyes, or had an allergic reaction when you used this drug before.


There are no adequate studies done which proves Methocarbamol’s effects in children. However, safety and efficacy have not been established.


This medicine does not cause any different side effects or problem than it does in younger adults. However, it should be used with caution in patient who has kidney or liver diseases.


It is a category C drug. It may cause harm or abnormalities in an unborn baby. It is safe not to use it during pregnancy.

Breast Feeding

Methocarbamol is not known if it can pass into breastmilk or not. If you are using it while nursing, discuss the potential risks with your doctor.

Drug Interactions

Methocarbamol may interact with other drugs. Your doctor should be informed of any other medicines which you are taking. He may want to change the dosage or drug.
Some of them are listed below,

  • Alfentanil
  • Alprazolam
  • Bromazepam
  • Buprenorphine
  • Carisoprodol
  • Clobazam
  • Clonazepam
  • Diazepam
  • Estazolam
  • Hydromorphone
  • Ketazolam
  • Levorphanol
  • Morphine
  • Morphine Sulfate Liposome
  • Nitrazepam
  • Oxazepam

Other Medical Conditions

Several other conditions may reduce its effectiveness.

Make sure you inform your doctor of conditions such as,

3 Proper Usage

A doctor or a trained health professional will inject this medicine through a needle into your vein or muscle.

When condition improves, your doctor may switch you to an oral dosage form.

4 Precautions to Take

Your doctor should check your daily progress at regular visits. He/she may want a blood or urine test to check for unwanted effects.

If Methocarbamol is not improving your symptoms, or your symptoms become worse, inform your doctor right away.

Avoid drinking alcohol or taking other medications that cause drowsiness such as

  • sedatives,
  • tranquilizers,
  • antihistamines,
  • narcotics,
  • barbiturates while taking Methocarbamol.

It will add to the effects of alcohol and other CNS depressants.

Methocarbamol can change the color of your urine.

5 Potential Side Effects

All medicines have some side effects. Some people may experience none or minor side effects.

Consult with your doctor if they become problematic or frequent.

More common are,

  • Dizziness or spinning sensation
  • Drowsiness
  • Headache
  • Confusion
  • Memory problems
  • Loss of balance or coordination
  • Nausea,
  • Vomiting
  • Upset stomach
  • Flushing (warmth, redness, or tingly feeling)
  • Blurred vision or double vision,
  • Eye redness
  • Sleep problems (insomnia)
  • Stuffy nose
  • Mild itching or rash

Symptoms of overdose are,

  • Change in consciousness
  • loss of consciousness

This is not a complete list of side effects and others may occur.

Call your doctor for medical advice about side effects.

You may report side effects to FDA at 1-800-FDA-1088.