![]() ![]() If you have any questions or concerns about antihistamines, please talk to your doctor or pharmacist. People with porphyria should talk to their doctor or pharmacist before taking antihistamines. ![]() are a woman who is pregnant or breastfeeding.You should talk to a pharmacist or doctor before taking an antihistamine if you: Even non-sedating antihistamines can make some people drowsy. If you use antihistamines you should be careful when operating machinery, such as driving a car. Some people get side effects from oral antihistamines such as: Some oral antihistamines may have a sedative effect, but others are non-sedating or non-drowsy. Others come as eye drops or nasal sprays, for treating specific symptoms only. When used as a night-time sleeping aid, the usual dosage of Benadryl is 50mg at bedtime. Benadryl in the injectable form has a rapid onset of action. The effects of diphenhydramine last from four to six hours. Oral antihistamines can be used to treat all of the symptoms of an allergic reaction. Benadryl is quickly absorbed after oral administration and peak effects are reached within one hour. These antihistamines are different from those used to treat allergies. Some antihistamines block histamine in the stomach and reduce acid production, and are therefore used to treat heartburn and indigestion. This reduces the severity of the reaction and eases the symptoms of allergy.Īntihistamines are commonly used to treat a number of conditions related to allergies and hypersensitivities such as: Treating allergies and allergic reactions with antihistaminesĪntihistamines are medicines that act by blocking the body's response to histamine in different parts of the body. In a way, it is trying to get you to sneeze out or scratch away the allergen. Histamine makes you sneeze, makes your nose run, and makes your eyes and skin itch, become red and swell up. When the body is exposed to allergens it releases histamine, a chemical that is an important part of your body’s immune response. If you are allergic to something, it is called an allergen. Your body can become sensitive to things around you, such as foods, plants, animals and medicines. Anaphylaxis should be treated with a shot of adrenaline into a muscle. Do not use antihistamines as they will work too slowly. If you think someone is having a serious allergic reaction, or anaphylaxis, call triple zero (000). ![]()
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