Antihistamines are drugs that treat allergy symptoms by blocking the effects of histamines. Histamine is a chemical that is released by the immune system when it detects a foreign substance in the body. Antihistamines come as pills, chewable tablets, capsules, and liquids.
Antihistamines can help treat allergy symptoms:
- Congestion, runny nose, sneezing, or itching
- Swelling of the nasal passages
- Hives and other skin rashes
- Itchy, runny eyes
How often should you take antihistamines?
Depending on your symptoms and conditions, you can take histamine:
- Everyday to keep your daily symptoms under control
- Only when you have symptoms
- Before being exposed to things that often cause symptoms
Pollen counts tend to peak in the morning. The National Allergy BureauTM (NAB) provides the most accurate and reliable pollen and mold levels from approximately 80 counting stations throughout the United States, two counting stations in Canada and two counting stations in Argentina.. Taking an antihistamine at bedtime may help you feel better in the morning during allergy seasons.