Which of the following is not a mechanism of action of acetylsalicylic acid (ASA, aspirin)?

Acetylsalicylic acid (ASA), commonly known as aspirin, is widely recognized for its multiple therapeutic actions, including analgesic (pain relief), anti-inflammatory, and antipyretic (fever reduction) properties.

The analgesic action of aspirin works by inhibiting the production of prostaglandins, which are chemicals in the body involved in pain signaling. This makes it effective for alleviating mild to moderate pain. Similarly, its anti-inflammatory effect is due to the same mechanism of prostaglandin synthesis inhibition, which helps reduce inflammation in conditions such as arthritis. As for its antipyretic properties, aspirin acts on the hypothalamus in the brain to help lower elevated body temperatures, facilitating fever reduction.

In contrast, aspirin does not possess antidiuretic properties. An antidiuretic drug would typically function by promoting water reabsorption in the kidneys, thereby reducing urine output and increasing fluid retention. Aspirin does not have this effect; its primary mechanisms are centered around pain relief, reducing inflammation, and lowering fever, making the identification of antidiuretic as not being one of its mechanisms of action accurate.