Antihistamines like Zyrtec and Claritin are designed to calm the histamine reaction your body has when it’s exposed to an allergen.When your body encounters something it’s allergic to, it sends out white blood cells and goes into fight mode. This substance causes many of the symptoms of an allergic reaction.
[ Read the disclaimer | Adults: Allergic rhinitis, seasonal/perennial: 5 mg po qd. In patients with liver or renal impairment, a starting dose of one 5 mg tablet every other day is recommended based on pharmacokinetic data.
Mechanism of Action Desloratadine is a long-acting tricyclic histamine antagonist with selective H1-receptor histamine antagonist activity.
It makes your nose feel less stopped up by narrowing the blood vessels inside your nostrils.
Pseudoephedrine's usefulness when making methamphetamine means that in the United States, these drugs need to be purchased directly from the pharmacist with a government ID.
Oral antihistamines can also help treat the symptoms of eye allergies.
Antihistamines are also available as nasal sprays for the treatment of allergic rhinitis (nasal allergies) and as eye drops for the treatment of allergic conjunctivitis (eye allergies).
They both calm your immune system’s reaction to allergens. They also take effect at different times and stay effective for different durations. Antihistamines have a reputation of making you sleepy because the first types crossed into your central nervous system more easily and had a direct effect on your alertness.
These factors could determine which of these two drugs is better for you. However, newer antihistamines like Zyrtec and Claritin are less likely to cause this side effect. Most people experience at least 24 hours of relief after a single dose. People who take it may feel relief in as little as one hour.
You just have to answer a couple of basic questions to figure out which to choose.
Of course, it is always a good idea to talk to your doctor before trying any new medication.
Antihistamines are commonly used for the treatment of various allergic diseases, and can be taken in oral, nasal spray, eye drop, and injected forms.