The best time to take hay fever tablets can be different from person to person, as you'll need to take into account how your allergy affects you and the type of medication you're taking.
Some people take hay fever tablets when their symptoms begin to show, while others take one every day if they know they are going to be exposed to allergens, like during high hay fever season.
You might take one before you visit a house with an animal to prevent your symptoms from flaring, too.
There are lots of different types of antihistamines, ones that are drowsy, non-drowsy, ones that work between 4 to 6 hours, and ones that last for 12 to 24 hours.
It’s important to read the instructions on the label carefully and pick a variety that works for you, for example, it might not be a good idea to take a drowsy variety if you suffer from hay fever during the day.