What is the primary use of codeine in pharmacology?

Codeine primarily serves as both a cough suppressant and an analgesic due to its action on the central nervous system. As an opioid, it works by binding to specific receptors in the brain and spinal cord, effectively reducing the perception of pain and providing relief from discomfort. Additionally, in lower doses, codeine is commonly prescribed as an antitussive, meaning it helps to suppress coughing by influencing the cough center in the brain.

Its dual function makes codeine a valuable medication in clinical settings, particularly for conditions that involve both pain and persistent coughing. The use of codeine for other purposes, such as those listed in the other options, does not align with its pharmacological profile and therapeutic indications.