Why is aspirin sold in the form of its sodium salt?

Aspirin is often sold as its sodium salt, sodium acetylsalicylate, because this form is more soluble in water than the free acid form. Increased solubility enhances absorption and bioavailability in the body, allowing for quicker onset of its therapeutic effects. Additionally, the sodium salt can be less irritating to the stomach, making it a more tolerable option for some patients.