Multimodal Analgesia

Multimodal analgesia uses two or more analgesic medications or techniques that affect different parts of pain processing. A postoperative regimen might pair acetaminophen with an NSAID, then add local anesthetic infiltration, a nerve block, or a limited opioid for breakthrough pain. Positioning, ice, relaxation, cognitive-behavioral strategies, TENS, and early mobilization can reinforce the medication plan. The logic is pharmacologic, not merely additive. Tissue injury triggers prostaglandin production and sensitizes nociceptors; NSAIDs reduce that peripheral inflammatory signaling. Local anesthetics block voltage-gated sodium channels, preventing nerve conduction. Opioids act primarily at mu receptors in the brain and spinal cord, changing the transmission and perception of pain. Acetaminophen provides centrally mediated analgesia through mechanisms that are not completely defined. Gabapentin and pregabalin act at the alpha-2-delta subunit of voltage-gated calcium channels and are most relevant to selected neuropathic or nerve-related pain. Using several mechanisms can improve analgesia while reducing the opioid dose required. That does not mean every patient needs every drug. It means the regimen should match the pain mechanism and the patient’s risks. Routine addition of a gabapentinoid to every perioperative...