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M-Oxy Oral

  • severe stomach/abdominal pain
  • change in the amount of urine
  • seizures


An empty tablet shell may appear in your stool (or colostomy bag). This is harmless, because your body has already absorbed the medication.

A very serious allergic reaction to this drug is rare. However, seek immediate medical attention if you notice any symptoms of a serious allergic reaction, including:

  • rash
  • itching/swelling (especially of the face/tongue/throat)
  • severe dizziness
  • trouble breathing


This is not a complete list of possible side effects. If you notice other effects not listed above, contact your doctor or pharmacist.

In the US -

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

In Canada - Call your doctor for medical advice about side effects. You may report side effects to Health Canada at 1-866-234-2345.

M-Oxy Oral Precautions

Before taking this medication, tell your doctor or pharmacist if you are allergic to it; or to other narcotic pain relievers (such as codeine, hydrocodone); or if you have any other allergies.

Before using this medication, tell your doctor or pharmacist your medical history, especially of:

  • intestinal/bowel disorders (such as paralytic ileus, infectious diarrhea, colitis, blockage)
  • kidney disease
  • liver disease
  • lung diseases (such as asthma, chronic obstructive pulmonary disease-COPD)
  • breathing problems (such as slow/shallow breathing, sleep apnea)
  • a certain spinal problem (kyphoscoliosis)
  • certain heart problems (such as low blood pressure, irregular heartbeat)
  • personal or family history of regular use/abuse of drugs/alcohol/other substances
  • brain disorders (such as seizures, head injury, tumor, increased intracranial pressure)
  • underactive thyroid (hypothyroidism)
  • difficulty urinating (for example, due to enlarged prostate or narrowed urethra)
  • disease of the pancreas (such as pancreatitis)
  • mental/mood disorders (such as toxic psychosis)
  • gallbladder disease
  • adrenal gland problem (such as Addison's disease)


This drug may make you dizzy or drowsy. Do not drive, use machinery, or do any activity that requires alertness until you are sure you can perform such activities safely. Avoid alcoholic beverages.

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