Yes, cetirizine is available over the counter in the United States. You can buy it at any pharmacy, grocery store, or online retailer without a prescription. It was originally a prescription-only antihistamine, but the FDA approved it for OTC sale in November 2007, covering tablets, chewable tablets, liquid formulations, and a version combined with a nasal decongestant.
What Cetirizine Treats
Cetirizine is a second-generation antihistamine, meaning it was designed to relieve allergy symptoms without causing as much drowsiness as older options like diphenhydramine (Benadryl). It works by blocking histamine, the chemical your body releases during an allergic reaction.
Its approved uses cover three main conditions. For seasonal allergies triggered by pollen from ragweed, grass, or trees, it relieves sneezing, runny nose, itchy nose, and itchy or watery eyes. For year-round allergies caused by dust mites, pet dander, or mold, it targets the same symptoms plus postnasal drip. It’s also approved for chronic hives, where it reduces the frequency, severity, and duration of outbreaks along with the associated itching.
Brand Names and Cost
Zyrtec is the most recognized brand name, but cetirizine is widely available as a generic and under dozens of store-brand labels: Aller-Tec, All Day Allergy, Equate Allergy Relief, and PediaCare Children’s 24-Hour Allergy, among others. The active ingredient is identical across all of them.
The price difference between brand and generic is substantial. Generic cetirizine runs about $0.07 to $0.11 per tablet when you buy a 100-count bottle, putting a three-month supply under $11. Zyrtec-branded tablets cost roughly $0.74 per tablet, or about $22 for a 30-count box. Buying generic saves you more than 85% with no difference in effectiveness.
Dosing for Adults and Children
Cetirizine is taken once a day, which is one of its advantages over some older antihistamines that require multiple doses. The standard adult dose (ages 12 and up) is 10 mg once daily. Children ages 6 to 11 take 5 to 10 mg once daily, depending on symptom severity. For younger children ages 2 to 5, the starting dose is 2.5 mg once daily, which can be increased to 5 mg per day if needed. Children’s versions come as a liquid or chewable tablet for easier dosing.
People with kidney problems typically need a lower dose, since the kidneys are responsible for clearing cetirizine from the body. If you have reduced kidney function, check with a pharmacist or doctor about the right amount.
Drowsiness and Side Effects
Cetirizine causes less sedation than first-generation antihistamines like diphenhydramine, but it’s not completely non-drowsy. Among the second-generation antihistamines (which also include loratadine and fexofenadine), cetirizine is generally considered the most likely to cause some sleepiness. In clinical trials with children ages 6 to 11, drowsiness was among the most commonly reported side effects occurring more often than with a placebo. Other reported effects in that age group included headache, stomach pain, and sore throat.
If you’re sensitive to this effect, try your first dose in the evening to see how it affects you. Many people take cetirizine at bedtime specifically so any drowsiness works in their favor. The sedation tends to be mild and often diminishes after a few days of regular use.
Use During Pregnancy and Breastfeeding
Cetirizine is considered one of the safer antihistamine choices during pregnancy. While large-scale studies are limited, current evidence shows no suggestion of harm to the baby. For breastfeeding, it’s one of the preferred antihistamines because only very small amounts pass into breast milk, and years of widespread use have not revealed a pattern of side effects in nursing infants. There is no evidence that cetirizine affects fertility in men or women.
If you’re breastfeeding and notice your baby feeding less than usual or seeming unusually sleepy after you start taking cetirizine, that’s worth flagging to your healthcare provider, though this is rare.
How It Compares to Other OTC Antihistamines
The three most common second-generation OTC antihistamines are cetirizine (Zyrtec), loratadine (Claritin), and fexofenadine (Allegra). All three are taken once daily and treat similar symptoms. The practical differences come down to onset, duration, and sedation. Cetirizine tends to start working within an hour and is often considered the most potent of the three for controlling symptoms, but it carries the highest drowsiness risk of the group. Fexofenadine is the least sedating but may be slightly less effective for some people. Loratadine falls in the middle on both counts.
If one doesn’t work well for you after a week or two of consistent use, switching to another is a reasonable next step. They all block histamine but have slightly different chemical structures, so individual responses vary.