Go to Settings > Calendar > Subscribe
You will see the list of doctors in your practice, and a link corresponding to their names.
Google Calendar Sync:
If you want to Sync it to your Google Calendar, copy the link by clicking on the copy button.
Go to your Google Calendar (calendar.google.com) and click on the dropdown box next to Other Calendar and select Add by URL.
Make sure you don’t select ‘Make This Publicly Available’ (To prevent others from viewing your calendar) and Click Add Calendar.
Your Practo Calendar has been synced to your Google Calendar.
If you want to Sync it to your Outlook or iCalendar, click on Outlook/iCal Link, which will directly sync your calendar. You need to have Outlook/iCal installed to use this.