Yes copays for prescriptions paid by you are deductible as a medical expense in itemized deductions. You can only deduct the amount of medical expenses in excess of 7.5% of your AGI. You may get a tax benefit if the total of all your itemized deductions is more than the standard deduction.
See this for what is included in itemized deductions: https://turbotax.intuit.com/tax-tips/tax-deductions-and-credits/what-are-itemized-tax-deductions/L1p...
Here are the standard deductions for 2019:
Single - $12,200 add $1,600 if age 65 or older
Married Filing Separately - $12,200 add $1,600 if age 65 or older
Married Filing Jointly - $24,400 add $1,300 for each spouse age 65 or older
Head of Household - $18,350 add $1,600 if age 65 or older