Morphine Sulfate Mercury Pharmaceuticals (Ireland ) (Morphine Sulfate)

Morphine Sulfate is an opioid analgesic used for managing pain conditions that require strong central nervous system depression.

• Severe acute pain: provides rapid relief of intense pain episodes.
• Postoperative pain: controls pain after surgical procedures to facilitate recovery.
• Cancer pain: alleviates persistent malignant pain when other analgesics are insufficient.

• Morphine Sulfate acts as a full agonist at mu‑opioid receptors in the central nervous system. Binding to these G‑protein‑coupled receptors inhibits adenylate cyclase activity, reduces calcium influx, and increases potassium efflux, leading to decreased neuronal excitability and suppression of pain signal transmission, resulting in analgesia and sedation.

Morphine Sulfate may cause a range of adverse reactions that vary in frequency and severity.

Common Side Effects

• Nausea and vomiting: gastrointestinal upset often occurring early in therapy.
• Constipation: reduced bowel motility leading to hard stools.
• Drowsiness: sedation or fatigue affecting alertness.
• Pruritus: itching, especially after intravenous administration.
• Dry mouth: reduced salivation causing discomfort.

Serious or Rare Side Effects

• Respiratory depression: slowed breathing that can be life‑threatening.
• Hypotension: significant drop in blood pressure.
• Severe allergic reaction: rash, swelling, or anaphylaxis.
• Dependence or withdrawal: signs of physical dependence with prolonged use.

Morphine Sulfate requires careful assessment before use to minimise risks.

• Assess pain severity: confirm that opioid therapy is appropriate for the level of pain.
• Evaluate respiratory status: avoid use in patients with compromised breathing.
• Monitor for sedation: watch for excessive drowsiness or impaired cognition.
• Check for drug interactions: review concurrent medications that may potentiate opioid effects.
• Store at ambient temperature: keep in original container, protect from moisture and light, and store below 25 °C.

Morphine Sulfate can interact with other medicines, altering its efficacy or safety profile.

Major Interactions (Avoid)

• Benzodiazepines: combined use may cause profound respiratory depression.
• CNS depressants (e.g., barbiturates, alcohol): increase risk of sedation and respiratory compromise.
• MAO inhibitors: may precipitate severe hypertension or serotonin syndrome.

Moderate Interactions (Monitor Closely)

• CYP3A4 inhibitors (e.g., ketoconazole): can raise morphine plasma levels.
• CYP3A4 inducers (e.g., rifampin): may reduce analgesic effect.
• Diuretics: may enhance hypotensive effects.