Antihistamines: what they can do and what to watch out for
Antihistamines are the most commonly used medicines to relieve allergy symptoms. First-generation ones cause more drowsiness; second-generation ones cause less. Ask your doctor which one to take and for how long.
What it helps with
Antihistamines block histamine receptors. They clearly relieve symptoms such as sneezing, a runny nose, an itchy nose, and the itching of urticaria (hives). They are a common first-line choice for relieving symptoms of allergic rhinitis and urticaria (hives).
Differences between generations
First-generation antihistamines are more likely to cause drowsiness and a dry mouth. Do not drive while taking them. Second-generation antihistamines cause much less drowsiness and are convenient because they are taken once a day. Your doctor will decide which one to use and for how long, based on your symptoms and lifestyle.
Common questions
- Can I stop once symptoms are controlled: your doctor will assess this. Do not take them long term on your own, and do not stop suddenly on your own.
- Drug interactions: tell your doctor about all the medicines you are taking when you see them.
- Special groups: pregnant women, breastfeeding women, children, and people with abnormal liver or kidney function need a doctor's guidance.
The dose and course of any medicine should follow your doctor's instructions. This article does not provide a specific treatment plan.
This article is for general information only and is not medical advice. Please follow your doctor's instructions.
This article is for general information only and is not medical advice. If your symptoms affect daily life, please see a doctor.