• Anxiety
• Constipation, biliary tract spasm*
• Diarrhea
• Dizziness, drowsiness
• Euphoria or dysphoria
• Fainting, palpitations
• Headache
• Lack of sexual drive
• Loss of appetite
• Memory loss
• Nausea, vomiting
• Pinpoint pupils
• Sleeplessness, insomnia
• Stomach pain
• Sweating
• Urinary urgency or retention
• Warmth, tingling, or redness under your skin, wheal swellings.

Other opiate side effects include:

• Dry mouth
• Erectile dysfunction
• Flushing
• Wheals (red, raised skin marks)
  

Patients may alleviate some adverse reactions by lying down. Morphine, like other opiate drugs, may also alter a body’s normal ability for temperature regulation.

Seek urgent medical attention in the event of:

• Slow or shallow breathing
• Slow or shallow heartbeat
• Fast or irregular heartbeat

• Severe—though infrequent--allergic reactions
• Swelling of the face
• Swelling of the lips
• Swelling of the mouth
• Swelling of the tongue
• Difficulty breathing
• Hives, itching
• Redness
• Severe rash
  

Severe Morphine side effects:

• Cold, clammy skin
• Confusion, hallucination
• Convulsion, seizures
• Depressed, changing moods
• Difficulty urinating
• Extreme nervousness
• Light-headedness, fainting
• Severe or persistent stomach pain
• Severe weakness or dizziness
• Tightness in the chest
• Tremors
• Yellowing of eyes or skin
  

Discuss Morphine use with your doctor beforehand if any of the following conditions apply:

• Addison's disease or other adrenal gland disorders
• Asthma, COPD, sleep apnea, or other breathing disorders
• Chest wounds, chronic pulmonary disorder
• Curvature of the spine
• Enlarged prostate, urination problems
• Epilepsy or other seizure disorder
• Gallbladder disease
• History of head injury, intracranial pressure, or brain tumor
• History of drug or alcohol addiction
• Liver or kidney disease
• Low blood pressure
• Mental illness
• Obesity (extreme)
• Under-active thyroid

Also check with your doctor before combining Morphine with other medications, which may have adverse contraindications with one another:

Other narcotic pain medications
Sedatives
Tranquilizers
Muscle relaxants

Medicines that

• cause drowsiness
• slow breathing.

MAO inhibitors:

• isocarboxazid (Marplan)
• phenelzine (Nardil)
• rasagiline (Azilect)
• selegiline (Eldepryl, Emsam)
• tranylcypromine (Parnate)
  

Others:

• pentazocine (Talwin)
• nalbuphine (Nubain)
• butorphanol (Stadol)
• buprenorphine (Buprenex, Subutex).

Dangerous side effects may result, or you may not be able to use Morphine or only with adjusted amounts as tested by your doctor.

NOTE: This list is not complete and other drugs may interact adversely with Morphine.

Doctors who administer Morphine believe that the benefits of this medicine determine acceptable risks, and the unlikely chance of harmful Morphine side effects. Contact your doctor immediately if any of the above Morphine side effects occur, reoccur, worsen or aggravate your health.