Advertisement

How do antihistamines work?

Antihistamines -- available as tablets, nasal sprays, and eye drops -- help relieve allergy symptoms by blocking the effects of histamine, a substance released by your body when you're exposed to an irritant. Antihistamines help reduce itching, sneezing, runny nose, and itchy, watery eyes. For congestion relief, antihistamine nasal sprays are more effective than tablets.

Second-generation antihistamines (such as loratadine and fexofenadine) are recommended over first-generation for treating seasonal allergies. These newer drugs have fewer side effects and are low-sedating or nonsedating, so they don't cause as much drowsiness as their older counterparts.

Continue Learning about Nasal Agent

What are the side effects of nasal cromolyn?
Sigma NursingSigma Nursing
The most common side effects people taking nasal cromolyn experience are irritated nasal passages (b...
More Answers
Are tetrahydrozoline eye drops safe for people of all ages?
Stacy Wiegman, PharmDStacy Wiegman, PharmD
Tetrahydrozoline is considered safe. But always check with your health-care provider. Tetrahydrozoli...
More Answers
What other medications do oral antihistamines interact with?
Donna Hill Howes, RNDonna Hill Howes, RN
If you are taking an opioid, antihistamines may not be good options for you. If you are taking a dr...
More Answers
What is a decongestant?
Donna Hill Howes, RNDonna Hill Howes, RN
Decongestants are available as pills, nasal sprays, or drops. They are meant for short-term use only...
More Answers

Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.