The best replacement for analgesia is anesthesia.

The best alternatives to analgesia are rated as following:
★★★★★  anesthesia
★★  anesthesia definition
★  epidural
★  sedation
★  epidural anaesthesia
  anesthesia dental
  anaesthesia
  analgesic
  epidural anesthesia
  regional anesthesia
  epidural analgesia

Your alternative for analgesia is not listed? Suggest!
Speaking about analgesia, one probably shouldn't forget about anesthesia.

Other search terms related to analgesia and their ratings are:
★★★★★ anesthesia
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Google Trends

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analgesia
anesthesia
anesthesia definition