What are the possible side effects of morphine?

Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat. Call your doctor at once if you have any of these serious side effects:

shallow breathing, slow heartbeat;
seizure (convulsions);
cold, clammy skin;
confusion;
severe weakness or dizziness; or
feeling light-headed, fainting.

Less serious side effects are more likely to occur, such as:

constipation;
warmth, tingling, or redness under your skin;
nausea, vomiting, stomach pain, diarrhea, loss of appetite;
dizziness, headache, anxiety;
memory problems; or
sleep problems (insomnia).

This list is not complete and other side effects may occur. Tell your doctor about any unusual or bothersome side effect.

What other drugs will affect morphine?

Avoid taking morphine if you have used an MAO inhibitor such as isocarboxazid (Marplan), phenelzine (Nardil), rasagiline (Azilect), selegiline (Eldepryl, Emsam), or tranylcypromine (Parnate) within the past 14 days. Side effects can be more severe if you use morphine before the MAO inhibitor has cleared from your body. Do not take morphine with other narcotic pain medications, sedatives, tranquilizers, muscle relaxers, or other medicines that can make you sleepy or slow your breathing. Dangerous side effects may result.

Before taking morphine, tell your doctor if you are using pentazocine (Talwin), nalbuphine (Nubain), butorphanol (Stadol), or buprenorphine (Buprenex, Subutex). If you are using any of these drugs, you may not be able to use morphine, or you may need dosage adjustments or special tests during treatment.

This list is not complete and there may be other drugs that can interact with morphine. Tell your doctor about all the prescription and over-the-counter medications you use. This includes vitamins, minerals, herbal products, and drugs prescribed by other doctors. Do not start using a new medication without telling your doctor.

Where can I get more information?

Your pharmacist can provide more information about morphine.

Remember, keep this and all other medicines out of the reach of children, never share your medicines with others, and use this medication only for the indication prescribed.

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