If I have type 2 diabetes. Can I take methocarbamol?

Methocarbamol Disease Interactions
There are 2 disease interactions with methocarbamol.

Major
Methocarbamol (parenteral) (applies to methocarbamol) renal dysfunction
Major Potential Hazard, Moderate plausibility.

The injectable formulation of methocarbamol is contraindicated for use in patients with impaired renal function due to the nephrotoxic potential of polyethylene glycol (PEG) 300 present in the vehicle. Quantities of PEG 300 much greater than that found in recommended doses of injectable methocarbamol have increased preexisting acidosis and urea retention in patients with renal impairment.

Moderate
Methocarbamol (parenteral) (applies to methocarbamol) seizures
Moderate Potential Hazard, Moderate plausibility.

Seizures have occurred during the intravenous administration of methocarbamol. In some cases, the patient had a known history of epilepsy, and the psychic trauma of the procedure may have been a contributing factor. Nevertheless, therapy with the injectable formulation of methocarbamol should be administered cautiously in patients with a history of epilepsy.

Source: https://www.drugs.com/disease-interactions/methocarbamol.html

Warnings
You should not use this medication if you are allergic to methocarbamol.

Before using methocarbamol, tell your doctor if you have myasthenia gravis.

You may need to reduce your dose after the first 2 or 3 days of treatment. Follow your doctor's instructions regarding the number of tablets you take each day.

Methocarbamol may impair your thinking or reactions. Be careful if you drive or do anything that requires you to be alert. Drinking alcohol can increase certain side effects of this medicine.

Before taking this medicine
You should not use methocarbamol if you are allergic to it.

To make sure this medicine is safe for you, tell your doctor if you have:

kidney disease;

a seizure; or

myasthenia gravis.

Methocarbamol may harm an unborn baby. Use effective birth control to prevent pregnancy, and tell your doctor if you become pregnant.

It may not be safe to breastfeed while using this medicine. Ask your doctor about any risk.

Methocarbamol is not approved for use by anyone younger than 16 years old unless to treat tetanus.

Source: https://www.drugs.com/methocarbamol.html

Short answer after researching is yes, you may use it as long it is prescribed by your Dr. as it is a prescription only medication (muscle relaxer).