CDHB

Morphine (short acting)

mor-feen

What does it do?

Morphine is used to relieve strong pain.

How should you take it?

Take morphine as directed with a glass of water.
Measure the liquid carefully with an oral syringe or measuring spoon.

What if you forget a dose?

If morphine is taken regularly, take the missed dose as soon as possible. If it is close to the time for your next dose, skip the missed dose and carry on as normal. Do not take two doses at the same time.

Can you take other medicines?

Some medicines available without a prescription may react with morphine including:

  • sedating antihistamines (e.g. Phenergan®)
  • cough suppressants (e.g. Duro-Tuss®, Benadryl Dry Forte®)

Tell your pharmacist or doctor about all medicines or treatments that you may be taking, including vitamins, herbal products (e.g. valerian) or recreational drugs.

Important information continues on next page.

What side effects might you notice?

Side EffectsRecommended action

Slow or shallow breathing, hard to wake up

Change in heartbeat

Tell your doctor immediately

Constipation

Confusion, dizziness, agitation, mood swings

Tell your doctor

Drowsiness, weakness, headache, trouble sleeping

Nausea, vomiting, stomach upset

Dry mouth or throat, changes in vision, trouble peeing

Swollen feet or legs

Sweating

Tell your doctor if troublesome

If you notice any other effects, discuss them with your doctor or pharmacist.

Other information:

  • Tell your doctor if you have lung, bowel, liver, kidney, bladder or heart problems; if you have ever had a seizure, or have had a recent head injury.
  • Tell your doctor if you are pregnant, planning to become pregnant, or breastfeeding.
  • Morphine ‘short acting’ can be taken regularly or when required. If morphine is not relieving your pain contact your health professional - your dose may need changing.
  • Morphine ‘short acting’ may be used with longer-acting pain relief medicines (e.g. morphine ‘long acting’ or fentanyl patches).
  • Morphine can impair your ability to do tasks such as driving or using machines. Alcohol makes this worse. Discuss your risk with your health professional. (search NZTA - Are you safe to drive?)
  • Morphine may be addictive with long-term use.