Hydration - How much water should I drink?

Your blood volume goes down a little when you donate. It’s important to be well hydrated so that you can feel well after. 

On the day before your donation, we recommend:

  • 10 glasses of fluid if you are a man
  • 8 glasses of fluid if you are a woman

In the three hours before you donate, drink three good-sized glasses of fluid (that’s 750 mL). 

If you’re a new donor and haven’t had enough water, it’s best to reschedule (just give us a call or log in).

If you’re a regular and you haven’t had enough, you should be fine to donate as long as you’ve had the same amount of fluids you normally would drink on the day before donating.

Water is best, but any non-alcoholic fluid will do the trick.

Want to know more? Read your donation guide