Aspirin

Aspirin is a step 1 analgesic compound, prescribed for mild to moderate pain. Aspirin mainly acts by inhibiting the production of prostaglandins, hormones involved in the transmission of the pain message. At low doses, it prevents vascular accidents; at medium doses it is a very effective and useful medicine for pain and temperature; and at high doses it's used as an anti-inflammatory agent. However, it does have significant side effects: a risk of stomach ulceration and occasionally mortal risks of allergy and bleeding.