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Morphine Injection

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Morphine injection is a strong opioid painkiller given via IV, IM, or SC for moderate to severe pain. It acts quickly but requires careful dosing to avoid respiratory depression and dependence. It is a controlled, prescription-only medication used under strict medical supervision.

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Generic Name:

  • Morphine Sulfate Injection

Prescription Status:

  • Prescription Only (Rx)

  • Controlled Drug (Narcotic) – typically classified as Schedule II or III, depending on country regulations

What It Is

Morphine injection is a potent opioid analgesic used for the relief of moderate to severe pain, including:

  • Post-surgical pain

  • Cancer pain

  • Pain from trauma

  • Severe chronic conditions

It is also used for acute pulmonary edema due to its calming and vasodilating effects.

How It Works

Morphine binds to opioid receptors in the brain and spinal cord, blocking the perception of pain and altering emotional responses to pain. It also slows the respiratory and central nervous system.

Forms & Routes

  • Supplied in 1 mL, 2 mL, or 10 mL ampoules or vials

  • Common strengths: 10 mg/mL, 15 mg/mL, 30 mg/mL

  • Routes:

    • Intravenous (IV) – for rapid onset

    • Intramuscular (IM) – for sustained effect

    • Subcutaneous (SC) – for slow absorption

    • Epidural or intrathecal – in specialized cases

Onset and Duration

  • IV: onset in 5–10 minutes, lasts 2–4 hours

  • IM/SC: onset in 15–30 minutes, lasts 3–5 hours

Dosage (Adult)

  • IV: 2.5 to 10 mg every 2–4 hours as needed (adjusted individually)

  • IM/SC: 5 to 20 mg every 4 hours

  • Titrated carefully based on pain severity, opioid tolerance, and age/renal function

Side Effects

Common:

  • Drowsiness

  • Constipation

  • Nausea and vomiting

  • Sweating

  • Lightheadedness

Serious:

  • Respiratory depression

  • Hypotension

  • Dependence, tolerance, or withdrawal symptoms

  • Confusion, seizures (in high doses or renal impairment)

Contraindications

  • Respiratory depression

  • Severe asthma or COPD (unless monitored)

  • Head injury with raised intracranial pressure

  • Paralytic ileus

  • Hypersensitivity to morphine

Special Precautions

  • Use caution in elderly, renal/hepatic impairment, or those on other CNS depressants

  • Pregnancy: use only if clearly needed; risk of neonatal withdrawal

  • Breastfeeding: not recommended due to risk of infant sedation/respiratory depression

Interactions

  • Additive sedation with benzodiazepines, alcohol, antipsychotics, or barbiturates

  • May enhance hypotensive effects of antihypertensives

  • Risk of serotonin syndrome with SSRIs, MAOIs, or tramadol

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