You may also want to check out the local Federal Qualified Health Center for very affordable, high quality care care and medications. They employ licensed and board certified physicians and dentist and the care is excellent. This is not a "free clinic" but I have found their fees are much lower and the quality of care higher than most clinics. Here is a link to an FQHC that has a clinic in Leesburg.
http://chcfl.org/services/medical/