Second dose - AstraZeneca COVID-19 vaccine

You should get your 2nd dose of AstraZeneca 8 to 12 weeks after your 1st dose.

We’ll text you when it’s time. You don’t need to do anything. 

Your text message will have your appointment time and location.

Your second dose is important

AstraZeneca is a 2-dose vaccine.

You need to get 2 doses to:

  • have the best protection against COVID-19 
  • be protected for longer against COVID-19
  • have the best protection against new variants of the virus, including the delta variant spreading in the UK

Go to your appointment for your 2nd dose when you are invited.

Read more about immunity after the AstraZeneca vaccine

If you are under 50

It’s important to get your 2nd dose of AstraZeneca if you have had a 1st dose. This is regardless of what age you are.

You are less likely to experience very rare side effects after getting your 2nd dose of AstraZeneca. This includes unusual blood clots.

Getting a different COVID-19 vaccine from your 1st dose is not recommended. This is because there is no current evidence that it could give you good protection against COVID-19.

Your second dose may be at a different location

Your 2nd dose may be given at a different location to your 1st dose.

This could be a healthcare centre or a vaccination centre

We’ll let you know in the text message we send you.

If you are a healthcare worker, your 2nd dose will be at either your workplace or a vaccination centre.

Changing your appointment

If you cannot attend your appointment, you can ask for a new one.

If your appointment is at a HSE vaccination centre, reply to the text message we sent you with the word "New".

You won't be able to choose the day or time. You can only reschedule twice.

You will get a reply saying "Your appointment is now cancelled. We will send you another text message with your new appointment details in the coming weeks."

If you are waiting more than 12 weeks for an appointment

Phone HSELive if it has been more than 12 weeks since your 1st dose and you have not got an appointment for your 2nd dose.

If it is less than 12 weeks, you don’t need to do anything. We will text you when it is your turn. 

Side effects

You're less likely to experience side effects after you get your 2nd dose of AstraZeneca.

But some people may still experience side effects.

Read about possible side effects from the AstraZeneca vaccine

Your vaccinator will be happy to answer any questions you have at your appointment.

If you are worried about side effects or getting your 2nd dose, you can also talk to your doctor.

Very rarely 1 in 100,000 people may develop very unusual blood clots with low platelets. These blood clots are less likely to be reported after the 2nd dose of the vaccine.

Change to second dose interval

We are working to reduce the time between the 1st and 2nd dose to 8 weeks. This will mean more people can get fully vaccinated quicker.

If you had your 2nd dose 12 to 16 weeks after your 1st dose, you are still protected against COVID-19.

This content was fact checked by vaccine experts working in Ireland

Last updated: 11 June 2021 at 11.20am