Antihistamines that are taken by mouth oral work better than those that are applied directly to the skin topical because a pill or capsule contains a specific dose of medicine. The dose in a cream or ointment depends on how much is applied at one time and is harder to control.
Too much antihistamine absorbed through the skin can be toxic, especially to children. Don't give any antihistamines to your child unless you've checked with the doctor first. The use of cream or ointment antihistamines is not reliable and not recommended.
Read and follow all instructions on the label. Be sure to follow the non-prescription medicine precautions. Do not take oral antihistamines when you are driving, are operating machinery, or need to be alert because they can make you sleepy. Use caution if you have other health problems, such as glaucoma, epilepsy, or an enlarged prostate. Antihistamines can cause your other health problems to get worse and also may interact with other medicines, such as antidepressants, sedatives, and tranquilizers.
Middleton's Allergy: Principles and Practice. Philadelphia, PA: Elsevier; chap Clinical practice guideline: allergic rhinitis. Otolaryngol Head Neck Surg. PMID: pubmed. Pharmacologic treatment of seasonal allergic rhinitis: synopsis of guidance from the joint task force on practice parameters.
Ann Intern Med. Updated by: David C. Editorial team. Antihistamines for allergies. One type of medicine that helps relieve allergy symptoms is an antihistamine. What are Antihistamines? How Antihistamines Help. Antihistamines treat these allergy symptoms: Congestion, runny nose, sneezing, or itching Swelling of the nasal passages Hives and other skin rashes Itchy, runny eyes Treating symptoms can help you or your child to feel better during the day and sleep better at night.
These symptoms may be due to hay fever , other upper respiratory allergies, or the common cold. Benadryl can also be used to treat hives and to reduce redness and itching. It comes in a tablet, a chewable tablet, a tablet that dissolves in your mouth, a capsule, a liquid-filled capsule, and a liquid. Benadryl also comes in topical forms, such as creams, gels, and sprays, to treat allergic skin conditions such as hives. Chlorpheniramine is the main active ingredient in Chlor-Trimeton.
It helps relieve runny nose, sneezing, itchy or watery eyes, and nose and throat itching from hay fever. It also helps relieve other respiratory allergies. It comes in an immediate-release tablet, an extended-release tablet, a chewable tablet, a lozenge, a capsule, and a liquid. If you have an enlarged prostate that makes it difficult for you to urinate, you should talk to your doctor before using first-generation antihistamines.
These drugs can make your urination problem worse. You should also talk to your doctor before using these drugs if you have any of these health concerns:. If you take other drugs that can make you drowsy, such as sedatives or tranquilizers, talk to your doctor before using first-generation antihistamines. You should also avoid drinking alcohol with any antihistamine because it can increase the side effect of drowsiness.
The newer second-generation and third-generation OTC oral antihistamines were developed to target their action on more specific receptors.
This helps decrease side effects, including drowsiness. Also, these drugs work longer in your body so you need fewer doses. Cetirizine is the main active ingredient in Zyrtec.
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