All medications can have side effects and that includes hay fever tablets.
It would be impossible for us to list every single one, as there is a range of active ingredients in allergy tablets that all come with their own potential symptoms to consider.
We would advise checking out the patient information leaflets that come with every medication, which have comprehensive lists of all side effects.
It’s important to familiarise yourself with the potential side effects of any medication before you take it, which is why we have links to online versions of these leaflets on every product page.
If you’re still unsure you should speak to your doctor or pharmacist and ask them to explain which symptoms you should look out for.
They will be able to tell you the most common side effects of your antihistamine of choice and help you to be sure you’re taking the best hay fever tablets for you.