Certificates
any benefit paid on its own and not listed on the back of the prescription (such as State Pension, Disability Living Allowance, Personal Independence Payment, or Incapacity Benefit)
You may be entitled to an exemption certificate to claim free NHS prescriptions.
NHS maternity exemption certificate
If you are pregnant or have given birth in the last 12 months you can get free NHS prescriptions.
But you must have a maternity exemption certificate.