The Pfizer-BioNTech, Moderna, and AstraZeneca vaccines each require two doses. Depending on where you receive your first COVID-19 vaccine, you may book an appointment for your second dose at the time of booking your first dose, or you can book an accelerated appointment, based on the information below.
Ontario is now accelerating second doses for all Ontarians. Booking an accelerated second dose appointment will be based on the timing of your first dose:
- If your first dose was AstraZeneca, you can get AstraZeneca, Moderna, or Pfizer for your second dose when you are eligible and it’s at least 8 weeks after your first dose with informed consent.
- If your first dose was Moderna or Pfizer, you should get the same vaccine for your second dose when you are eligible and it’s at least 28 days after your first dose. You can switch between Moderna and Pfizer safely if the original vaccine you got is not readily available.
For a schedule on accelerated second dose eligibility, please see the chart on this page.
How to Book or Reschedule Your Second Dose Appointment
If you have had your first dose and are eligible for an accelerated second dose (please see this chart to see if you are eligible), you can rebook your second dose appointment by contacting the location where you received your first dose. Depending on which vaccine you received, you may also be able to book at another location:
- If you received Pfizer or Moderna for your first dose, you can also book through the provincial booking system
- If you received AstraZeneca for your first dose, please see the information below about booking your second dose
Many hospitals are contacting people who received their first dose at the hospital or pop-up clinics to book their second dose as they become eligible. Please check your email (including your junk mail folder) and the phone number you provided when you booked or received your first dose.
If you already have a second dose appointment booked, you can choose to keep your current second dose appointment. If you book a second dose appointment at a different location, please make sure to cancel the other appointment so it can be made available to someone else.
Booking a Second Dose of the AstraZeneca Vaccine
If you received a first dose of the AstraZeneca vaccine between March 10 and March 19, 2021, you are eligible to book your second dose beginning the week of May 24, at an earlier interval of 8 weeks with informed consent. Receiving the second dose of AstraZeneca at the 8-week interval is safe and provides strong protection against COVID-19. Contact the pharmacy or primary care provider where you received your first dose to book your second dose.