Meperidine Drug Profile

What is Meperidine?

Meperidine is a synthetic opioid analgesic medication used to treat moderate to severe pain. It belongs to the phenylpiperidine class of opioid drugs and works by binding to opioid receptors in the brain and spinal cord. Due to safety concerns and the availability of safer alternatives, meperidine is now used less frequently than other opioid medications.

Uses

Meperidine is prescribed for several pain management situations:

• Acute pain relief: Used for moderate to severe pain when other analgesics are insufficient, such as after surgery or injury
• Labor pain: Sometimes administered during childbirth to help manage labor pain, though other options are often preferred
• Preoperative sedation: May be given before surgery to reduce anxiety and provide pain relief
• Chronic pain management: Rarely used for long-term pain due to safety concerns with prolonged use
• Rigors and shivering: Occasionally used to control severe shivering, particularly after anesthesia

How it works

Meperidine works by binding to mu-opioid receptors in the brain and spinal cord, blocking pain signals from reaching the brain. This action reduces the perception of pain and can also produce feelings of euphoria and sedation. Unlike some other opioids, meperidine also has local anesthetic properties and can affect serotonin reuptake, which contributes to both its effects and side effect profile.

Side effects

Common side effects include:

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• Drowsiness and sedation
• Nausea and vomiting
• Constipation
• Dizziness or lightheadedness
• Dry mouth
• Sweating
• Confusion or disorientation
• Headache

Serious side effects requiring immediate medical attention:

• Respiratory depression (slow or difficult breathing)
• Seizures, particularly with high doses or prolonged use
• Severe allergic reactions with rash, swelling, or difficulty breathing
• Signs of serotonin syndrome (agitation, hallucinations, rapid heartbeat, high fever)
• Signs of dependency or withdrawal symptoms

Warnings and precautions

• Addiction potential: Meperidine carries a high risk of physical dependence, addiction, and abuse, requiring careful monitoring
• Kidney impairment: Patients with kidney problems should avoid meperidine as toxic metabolites can accumulate and cause seizures
• Pregnancy considerations: Should be used during pregnancy only when benefits outweigh risks; can cause respiratory depression in newborns
• Elderly patients: Older adults are at increased risk of confusion, falls, and breathing problems
• Respiratory conditions: Should be avoided in patients with severe asthma, respiratory depression, or other breathing problems

Interactions

• MAO inhibitors: Can cause dangerous increases in serotonin levels, leading to potentially fatal serotonin syndrome
• CNS depressants: Alcohol, benzodiazepines, and other sedating medications increase the risk of respiratory depression
• Serotonergic drugs: SSRIs, SNRIs, and triptans may increase serotonin syndrome risk
• Antihistamines: Can enhance sedating effects and increase drowsiness
• Muscle relaxants: May increase respiratory depression and sedation when combined
• Phenytoin: Can increase meperidine metabolism, potentially reducing pain relief
• Warfarin: Meperidine may enhance anticoagulant effects, increasing bleeding risk
• Ritonavir: Can increase meperidine levels, potentially leading to toxicity

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Dosage

Typical adult dosages vary based on the route of administration and severity of pain. For oral administration, doses typically range from 50-150 mg every 3-4 hours as needed for pain. Injectable forms may use doses of 25-100 mg every 3-4 hours. Due to the risk of toxic metabolite accumulation, treatment duration should generally be limited to 48 hours or less. Dosages must be individualized based on patient factors including age, kidney function, other medications, and pain severity. Healthcare providers will determine the appropriate dose and monitor for effectiveness and side effects.

Sources: FDA DailyMed drug labels (public domain), BNF, WHO Essential Medicines List. This article is for informational purposes only and does not constitute medical advice. Always consult your healthcare provider before starting or stopping any medication.

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