You can create your own email templates that can be used as the basis for email/pdfs sent to patients. You need Manage Public Templates permissions to edit and manage communication templates. (See this article to learn more from Salesforce: Manage Email Templates.)
To create a new template:
Merge Fields: Inca Clinic uses a feature called Merge Fields. These placeholders allow you to insert information such as the Patient's name and the name of you clinic. When the email/letter is created for a patient, the merge fields are replaced with information about that patient; for example, the patient's name. The following merge fields can be used:
(Note: IncaClinic__Patient_Appointment__c.IncaClinic__Medical_Centre__c has 2 underscore characters between c and P; a single underscore character between t and A; two underscore characters between t and c; two underscore characters between c and M; a single underscore character between l and C; and finally two underscore characters between e and c. Similarly for %%IncaClinicPatient_Appointmentc.IncaClinicStart_Timec.)
When you've saved your template make sure you make it Active.
Incaplex offers consultancy services around this feature; contact sales@incaplex.com for more information.