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Allegra-D contains fexofenadine, a non-drowsy antihistamine that blocks histamine receptors to reduce sneezing, runny nose, and itchy eyes, combined with pseudoephedrine, a decongestant that narrows blood vessels in the nasal passages to relieve stuffiness.

No. Regular Allegra contains only fexofenadine (the antihistamine). Allegra-D adds pseudoephedrine, a decongestant, making it more appropriate when nasal congestion is also a significant symptom.

Allegra-D may not be suitable for people with uncontrolled high blood pressure, severe heart disease, hyperthyroidism, narrow-angle glaucoma, urinary retention, or those taking monoamine oxidase inhibitors (MAOIs). A physician will review your health history before prescribing.

Yes. The pseudoephedrine component can increase blood pressure and heart rate. Patients with hypertension or cardiovascular conditions should discuss this risk with their doctor before use and may need closer monitoring.

Allegra-D 12-hour tablets are typically taken twice daily and the 24-hour formulation once daily, with a full glass of water. It should be taken on an empty stomach if possible, as certain fruit juices can reduce absorption of fexofenadine.

Common side effects include headache, insomnia, dry mouth, nausea, and nervousness or restlessness, primarily due to the pseudoephedrine component. Fexofenadine is generally well tolerated and is considered non-drowsy compared to older antihistamines.

Doctronic uses AI-driven evaluation to gather your symptom and health history, which is then reviewed by a licensed physician. The physician creates a personalized treatment plan, which can include a prescription when clinically appropriate.

Yes. Doctronic connects you with licensed physicians who review and audit every treatment decision. The platform is HIPAA-compliant and available to adults 18 and older in any U.S. state.