Neither Zyrtec (cetirizine) nor Telfast (fexofenadine) is definitively "stronger," as their effectiveness varies by person and symptom, but studies suggest Zyrtec might offer faster relief for some symptoms like sneezing, while Telfast (fexofenadine) is significantly less likely to cause drowsiness, making it ideal for those needing focus, though both are effective second-generation antihistamines.
There's no single "strongest" antihistamine, as potency varies by person, but prescription options like Desloratadine, Levocetirizine (Xyzal), and higher-dose Fexofenadine (Allegra) are considered very powerful for severe allergies, while strong OTC choices include Cetirizine (Zyrtec) and Fexofenadine, offering fast, non-drowsy relief. Stronger antihistamines work by blocking histamine more effectively, but older types (like Benadryl) cause more drowsiness.
Cetirizine (Zyrtec®, Reactine®) is an antihistamine used to treat and prevent pruritus (itching) associated with atopic dermatitis, urticaria (hives), and insect bite reactions in cats and dogs. It may also be used for respiratory allergy symptoms. Its use in cats and dogs is off label (extra label).
Fexofenadine Hydrochloride 120mg: A powerful, non-sedating antihistamine that blocks histamine, the substance responsible for allergy symptoms. Microcrystalline Cellulose: Helps form the tablet and aids with digestion.
Do not take Telfast if you are pregnant, unless necessary. Telfast is not recommended during breast-feeding. Telfast is unlikely to affect your ability to drive or operate machinery. However, you should check that these tablets do not make you feel sleepy or dizzy before driving or operating machinery.
It's generally not recommended to take both cetirizine and fexofenadine at the same time. They are similar oral antihistamine medications, so taking them together puts you at a higher risk of increased side effects without adding extra benefits. Stick to one or the other as prescribed.
Yes, Zyrtec (cetirizine) is generally considered safe to use during pregnancy, with healthcare providers often recommending it as a first-choice antihistamine, but you should always consult your doctor or pharmacist first to confirm it's appropriate for your specific situation and to avoid combination products with decongestants (like Zyrtec-D). While studies haven't shown links to birth defects, it's best to use it only when necessary and be aware of potential drowsiness.
Neither Telfast (fexofenadine) nor Zyrtec (cetirizine) is universally "better," as they are both effective second-generation antihistamines, but they suit different needs: Telfast (fexofenadine) is often preferred for non-drowsy relief, while Zyrtec (cetirizine) might be faster or better for specific symptoms like sneezing and runny nose but is more likely to cause sleepiness in some people. Your best choice depends on your symptoms, how quickly you need relief, and your sensitivity to drowsiness, so consulting a doctor or pharmacist is recommended.
Get fast-acting, all-day relief from hayfever allergies like a runny nose, sneezing, itchy, watery eyes, and itchy nose or throat. Telfast® kicks in within just one hour with no impact on concentration1 that's right, it is non-drowsy so you may stay focused.
Although most people will not experience any, some of the side effects that may occur with Telfast® are:
Zyrtec is used in adults and children to treat cold or allergy symptoms such as sneezing, itching, watery eyes, or runny nose. Zyrtec is also used to treat itching and swelling caused by chronic urticaria (hives).
There are situations where dogs should not take Zyrtec: Dogs with kidney or liver disease: These are the organs most active in metabolizing and excreting medications.
Zyrtec (cetirizine) is an over-the-counter (OTC) medication that helps relieve allergy symptoms, such as sneezing and watery eyes. It works by blocking histamine, a substance in the body that can cause these symptoms. Zyrtec begins to work quickly. Many people start noticing relief within 20 to 60 minutes.
Cetirizine has the fastest onset of action among the newer antihistamines.
Antihistamines can stop working because your allergies might be getting worse or you might have immune system changes due to aging. You also might not be taking the medication as directed. If you take an antihistamine after being exposed to an allergy trigger, it won't work as well.
We know how crucial it is to have an antihistamine potent enough to tackle severe reactions. Stronger options such as Cetirizine, Fexofenadine, and Desloratadine block histamines (the chemical responsible for allergic reactions) better.
How do I use Telfast? For the relief of the symptoms of hayfever, the usual dosage for adults and children over 12 years old is one Telfast 60 mg tablet twice daily or one Telfast 120 mg tablet once daily or as necessary. Follow the instructions written on the back of the box.
Try not to drink alcohol while taking an antihistamine, particularly if it's a type that makes you drowsy, as it can increase the chances of it making you feel sleepy. Food and other drinks do not affect most antihistamines, but check the leaflet that comes with your medicine to make sure.
Fexofenadine Brand names: Allevia, Almerg, Histallay, Telfast, Treathay. Find out how fexofenadine treats symptoms of allergies and reactions to insect bites and stings, and how to take it.
In general, Zyrtec, Claritin, and Allegra are all similarly effective for treating allergies. But some studies suggest Allegra might work slightly better for eye-related symptoms.
Common side effects of cetirizine and levocetirizine include fatigue, drowsiness, sore throat, cough, dry mouth, nosebleed, fever, diarrhea, and vomiting.
Some of the strongest over-the-counter antihistamines include cetirizine 10mg, fexofenadine 120mg, or loratadine 10mg. However, if you have more severe symptoms, you may need a stronger prescription-only antihistamine like fexofenadine 180mg or desloratadine.
have an allergy to food additives. have an allergy to peanuts or soya – some brands of cetirizine capsules (but not tablets) contain soya. have kidney failure. have epilepsy or another health problem that means you're at risk of having seizures or fits.
There's no evidence to suggest that taking cetirizine will reduce fertility in either men or women. Speak to a pharmacist or your doctor before taking it if you're trying to get pregnant.
As well as taking a non-drowsy antihistamine during the day (such as cetirizine or loratadine), your doctor may advise that you take a drowsy antihistamine at night time if the itching is making it difficult to sleep. Do not take 2 antihistamines together unless recommended by your doctor.