Lorraine
I assume you are currently receiving New Style ESA and that the income you mention is from your pension.
To be entitled to free prescriptions you need to be eligible to an Income Related benefit such as Universal Credit, you can claim this in addition to your ESA but even if you make a claim you will still not be entitled due to your income, however, if you are put in the ESA Support Group or UC LCWRA group then you may.
In the interim, you can purchase a Prescription Prepayment Certificate
www.gov.uk/get-a-ppc Gordon
