Side effects of Methocarbamol that can occur in dogs and cats may include weakness, stumbling, incoordination, drooling, and vomiting. Methocarbamol may cause a discoloration of the urine. Talk to your veterinarian about any side effects that seem unusual or bothersome to the animal. If any of the following serious side effects occur, stop giving your pet Methocarbamol and seek emergency veterinary medical attention: an allergic reaction (difficulty breathing, swelling of the lips, tongue or face; hives).
When used in combination with other medications that may cause drowsiness, the sedative effect of methocarbamol will increase. Tell your veterinarian if your pet is being given any other medications such as antihistamines (chlorpheniramine), gabapentin, metoclopramide, opioid narcotics, tranquilizers (acepromazine), or any other medication that may cause drowsiness.
Drugs other than those listed may also interact with methocarbamol. Talk to your veterinarian or pharmacist before giving any prescription or over the counter medicines including vitamins, and supplements to your pet while they are taking methocarbamol.