Question: what is the strongest over the counter back pain medicine?
Answer: Tylenol (acetaminophen) Tylenol (brand name) is acetaminophen (generic). The most common strengths are regular strength (325mg) and extra strength (500mg). ... 
Aleve (naproxen) Aleve is the brand name of the generic drug naproxen. The pro of naproxen over ibuprofen is that it lasts 8 to 12 hours.