Allegra-D should be avoided while taking tricyclic antidepressants or monoamine oxidase MAO inhibitors. The pseudoephedrine in Allegra-D can interact with these other drugs and lead to an increased risk of high blood pressure hypertension or irregular heartbeat arrhythmia. Otherwise, these drugs may cause an allergic reaction such as a severe rash or trouble breathing anaphylaxis. Allegra and Allegra-D should be avoided in people with kidney disease. Since fexofenadine is cleared from the body through the kidneys, altered kidney function may lead to an increased risk of toxicity and adverse effects.
The use of Allegra-D may need to be avoided or monitored in those with high blood pressure and heart disease. Pseudoephedrine works by constricting blood vessels to reduce congestion. This effect may increase the risk of complications from cardiovascular disease. Consult your healthcare provider for other precautions to be aware of before taking Allegra or Allegra-D. Allegra is the brand name of fexofenadine. It is used to treat hay fever allergic rhinitis and hives urticaria in adults and children.
Allegra can be found over the counter and is available in tablet and liquid formulations. Allegra-D contains fexofenadine hydrochloride and pseudoephedrine. It can be purchased over the counter to help relieve allergy symptoms such as runny nose, watery eyes, and nasal congestion. Allegra-D is available as a hour and hour oral tablet.
Allegra and Allegra-D both contain fexofenadine HCl. However, they are not the same drug. Allegra-D contains another active ingredient called pseudoephedrine.
Both Allegra and Allegra-D work for relieving general allergy symptoms. Since Allegra-D contains an added decongestant, it may be better for certain symptoms like congestion or stuffy nose. Allegra may be used during pregnancy if the benefits outweigh potential risks to the fetus. Therefore, these drugs should only be used with approval from your healthcare provider. Consult your doctor before using Allegra or Allegra-D during pregnancy.
While occasional alcohol consumption may be fine while taking a second-generation antihistamine, it is not usually recommended. Alcohol may cause side effects such as dizziness or drowsiness, which can be intensified with an antihistamine. Allegra-D contains fexofenadine, which has the potential to cause drowsiness. However, this drug also contains pseudoephedrine, which has stimulating effects on the central nervous system CNS. Allegra-D may cause sleepiness or trouble sleeping depending on your individual response to the medication.
Compared to first-generation antihistamines, Allegra-D will cause less drowsiness. Allegra-D is an over-the-counter drug that can be purchased without a prescription. According to federal law, Allegra-D is kept behind the counter at the pharmacy. When you get injured or your immune system detects a potentially dangerous foreign substance, certain white blood cells and tissue cells release histamines that seek out and attach to other cells that have a histamine receptor.
Here, the histamines induce an inflammatory response — they dilate the blood vessels, increasing blood flow to the site of injury or invasion. They also make blood vessels more permeable, allowing proteins and white blood cells to seep into the damaged or infected tissue. But there are side effects to this healing process. For example, when you're fighting a cold the rhinovirus , histamines widen the blood vessels in your nasal cavity, causing nasal congestion.
Additionally, the increased fluid leakage from your blood vessels, combined with an increased mucous production — also caused by histamines — can result in a runny nose. How does this happen?
Histamine is a chemical produced by the immune system to fight off allergens and germs. When there is a threat of allergies or infection such as the common cold , histamine is even more active. In its search-and-destroy process, it can cause allergy or cold symptoms such as runny nose, coughing, sneezing and itch eyes.
Antihistamine medications relieve these symptoms by blocking the unwanted effects of histamine. Unrelated to the immune system, histamine is also produced in the brain, where it plays an important part in feeling awake. Antihistamines used to treat respiratory symptoms can get into the brain and interrupt this work, making you feel drowsy.
Some antihistamines are less likely to cause drowsiness than others. Reactions vary considerably from one person to another. What relieves your symptoms without making you sleepy may be different from what works for someone else. When you find one that works for you, stick with it — check chemical ingredients and dosages before changing brands or generics. An added benefit is that second-generation antihistamines last longer than Benadryl.
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