Loratadine

Allergy

Also known as Claritin

Loratadine is a non-drowsy antihistamine. It blocks histamine, the chemical your body releases during an allergic reaction, which is what causes sneezing, itchy eyes, and a runny nose. Of the common allergy pills, it's one of the least likely to make you sleepy. It works best when you take it regularly during allergy season rather than waiting until you're miserable.

How to take it

When

Once a day. It can take an hour or more to kick in, so it's better as a daily habit than a rescue.

Food

With or without food — doesn't matter.

Avoid

Don't take more than the label's daily maximum, and don't stack it with other antihistamines — check cold and sleep products for hidden antihistamine ingredients.

Good to know

Truly non-drowsy for most people. If it stops working well for you, switching to a different antihistamine like cetirizine or fexofenadine sometimes helps.

Missed a dose?

If you take it daily and forget a dose, take it when you remember — unless it's nearly time for the next one, in which case just skip it. Never double up.

Common side effects

Headache
Dry mouth
Feeling tired (uncommon)
Nervousness in some people

Call a doctor if

Trouble breathing, or swelling of your face, lips, or tongue — call emergency services now. Antihistamine pills cannot stop a severe allergic reaction; that needs epinephrine and emergency care.
Wheezing or throat tightness that comes on suddenly — get emergency help
Fast or pounding heartbeat
A rash that blisters or spreads quickly

Educational only. This summary is drawn from public FDA labeling and MedlinePlus and simplified for readability. Your prescription label and your pharmacist always come first — doses and instructions vary from person to person.