Over-the-counter OTC antihistamines are medicines that treat allergy symptoms. They are available as pills, liquids, nasal sprays, gels, and eyedrops. There are two types of OTC antihistamines: Both can help allergies. When your body is exposed to allergens allergy triggers , it makes histamines. Your body releases these chemicals to attack the allergen.
Popular Over-the-Counter Oral Antihistamine Brands
List of Common Antihistamines + Uses & Side Effects - kemalbolat.com
Allergy medications are available as pills, liquids, inhalers, nasal sprays, eyedrops, skin creams and shots injections. Some are available over-the-counter; others are available by prescription only. Here's a summary of the types of allergy medications and why they're used. Antihistamines block histamine, a symptom-causing chemical released by your immune system during an allergic reaction. Oral antihistamines, available over-the-counter and by prescription, ease a runny nose, itchy or watery eyes, hives, swelling, and other signs or symptoms of allergies. Because some of these drugs can cause drowsiness and fatigue, take them with caution when you need to drive or do other activities that require alertness. Antihistamine nasal sprays help relieve sneezing, itchy or runny nose, sinus congestion, and postnasal drip.
Antihistamines: Understanding Your OTC Options
Medically reviewed by C. Fookes, BPharm Last updated on Feb 5, Antihistamines are a class of agents that block histamine release from histamine-1 receptors and are mostly used to treat allergies or cold and flu symptoms, although some first-generation antihistamines may also be used for other conditions. Histamine-1 receptors are located in the airways, blood vessels and gastrointestinal tract stomach and esophagus. Stimulation of these receptors can lead to conditions such as a skin rash or inflammation, a narrowing of the airways bronchoconstriction , hay fever , or motion sickness.
When you have an allergic reaction, your body releases a substance called histamine. Histamine causes allergy symptoms when it binds to receptors on certain cells in your body. Antihistamines work by decreasing the effects of histamine at certain cell receptors. Read on to learn how the different brand-name antihistamines can help treat your allergy symptoms.