Antihistamines are a cornerstone of allergy treatment. They block the effects of histamine, a chemical your body releases during an allergic reaction. By doing so, antihistamines help relieve sneezing, a runny nose, watery eyes, and an itchy throat. Popular OTC antihistamines include cetirizine (Zyrtec), fexofenadine (Allegra), and loratadine (Claritin). These “second-generation” antihistamines are less likely to cause drowsiness than older medications like diphenhydramine (Benadryl). The choice between these often depends on how quickly you need symptom relief, how long you want it to last, and your tolerance to possible side effects. Most oral antihistamines are taken once daily. Always follow package instructions, as some products may differ in dosing, especially for children or older adults.
For more on antihistamine options, see Allergy Antihistamines & Medication.
Decongestants temporarily relieve nasal stuffiness by shrinking swollen blood vessels in your nasal passages. Common oral decongestants include pseudoephedrine and phenylephrine. Nasal decongestant sprays (like oxymetazoline) deliver fast relief directly to the nasal tissues. However, using them for more than three consecutive days can lead to rebound congestion, making nasal allergy symptoms worse. Always use these sprays according to the package directions.
Learn more about nasal spray options and their benefits at our allergic rhinitis page.
For more information or to book a consultation, visit the Allergy & Asthma Clinic or explore telehealth options.
While OTC allergy medicines can provide significant relief, not all symptoms respond equally to non-prescription options. At our clinic, you’ll find specialized information, support, and a commitment to helping you breathe easier year-round. Whether you’re struggling with seasonal allergies, indoor triggers like dust or pets, or food sensitivities, the Allergy & Asthma Clinic offers up-to-date resources and expert insights to help you take control of your health with allergy immunotherapy, nasal corticosteroids, and other treatments.
Choosing the over-the-counter allergy medicine comes down to matching the right product to your specific symptoms and medical needs. With various effective options available, relief is within reach for most allergy sufferers. For persistent or severe allergic rhinitis or guidance tailored to your unique situation, trusted resources like the Allergy & Asthma Clinic are always ready to help with allergy shots and other advanced treatments.
San Mateo Office
Phone- (650) 343-4597 | Fax-(650) 343-3402
Daly City Office
Phone- (650) 991-0405 | Fax-(650) 343-3402
Food Allergies
Environmental Allergies
Skin allergies
Other CommonAllergies
Nose & Sinus Allergies
Allergy Shots
Allergy Medications
Lifestyle Changes
First and foremost let me start by saying that these people did one hell of a job figuring out my sinus problems. When I first arrived there, I explained what was going on with me having excessive inflammation in the sinus…after they tested me, I found out that I was being exposed to dust mites which gave me a strong reaction. I followed the doctors guides lines in terms of cleaning my room and ever since, my sinus inflammation went away for good and now I have a healthy sinus. Thank you for everything.
My 10 year old son also has allergies and asthma and the staff makes sure that he feels well taken care of and comfortable, despite his having Autism and ADHD. He actually looks forward to going there with me, whether it be for my allergy shots or even when he needed allergy skin testing. When you’re a patient at the Allergy and Asthma clinic, you are treated as if you are the only patient they have, even when the waiting room is full. Dr. Engler has hired truly excellent staff, from the front desk people to the nurses and medical assistants. If you have allergies and/or asthma and you live on the Peninsula or even in the city, I highly recommend that you visit the Allergy and Asthma Clinic. They are truly amazing and will make you feel so much better.