Can i deduct over the counter pain relievers?

No. Only prescription medications are deductible medical expenses.

Not as a medical expense for Schedule A UNLESS you have a Dr. Prescription or other written direction to purchase that product. 

It cold be used to offset a Flexible Spending Account. 

Deducting over-the-counter pain relievers like Aleve for arthritis pain relief could be possible if you have a flexible spending account (FSA) or health savings account (HSA). However, it's essential to consult with a tax professional to understand the eligibility criteria and any limitations.
When it comes to managing arthritis pain, finding the right support can make a big difference. Alongside pain relievers, using the best knee brace can provide added stability and comfort. They offer a wide range of options designed to cater to various needs and preferences.

You could use a Flexible Spending Account or Health Spending Account to purchase those types of items, but no, they would not be considered deductible medical expenses for Schedule A unless  prescribed by a physician.