Morphine sulfate


Drug Class:

Analgesics (Opioid)

Brand Names

Avinza, Kadian, MS Contin, Oramorph SR



Dosage depends on the brand and form of morphine sulfate prescribed.

Avinza: 30 mg daily in a single dose.

Kadian: 10 to 20 mg daily in a single dose.

MS Contin: 5 to 30 mg every 4 hours or as directed by your doctor.

Oramorph SR: 15 to 100 mg every 8 to 12 hours.

Dosages for children: The dosages listed above are those typically prescribed for adults aged 18-65. Dosages for children can vary. Ask your doctor about the appropriate dosage for your child.

Potential Side Effects


Constipation; dizziness; drowsiness; itching; lightheadedness; low blood pressure; mental confusion; nausea; shortness of breath; urinary retention; vomiting.

Special Instructions

  • Take at the same time every day.

Be Aware

  • Opioids can slow breathing and suppress the cough reflex. Before taking an opioid, tell your doctor if you have a history of lung disease or breathing difficulties. Taking opioids with certain other drugs can increase the risk of dangerous side effects. Especially tell your doctor if you take antihistamines (allergy medications), tranquilizers, sleeping pills, muscle relaxants or other pain medication, or if you have a history of alcohol or drug abuse.

The Arthritis Today Drug Guide is meant for education – not self-medicating. Arthritis Today, the Arthritis Foundation and the Drug Guide Medical Review Panel do not endorse any products mentioned in this guide. While we endeavor to keep the information up to date, we make no representations or warranties about the completeness of the information provided.

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