About Allegra.

Secondary to the pseudoephedrine component, fexofenadine HCl; pseudoephedrine HCl should be used with caution in patients with the following medical conditions:

• Hypertension
• Diabetes mellitus
• Ischemic heart disease
• Increased intraocular pressure
• Hyperthyroidism
• Prostatic hypertrophy
• Renal impairment (patients with decreased renal function should be given a lower initial dose (one tablet per day) because they have reduced elimination of fexofenadine and pseudoephedrine)

Yes, you may take Allegra D when you anticipate allergy symptoms e.g. visit to a neighbors house with pets, mowing the lawn, etc. Taking the antihistamine prior to the exposure can significantly reduce the symptoms.

In addition, to the active ingredient in Allegra, Fexofenadine HCL, Allegra D also contains pseudoephedrine HCl. Pseudoephedrine HCl is an orally active sympathomimetic amine and exerts a decongestant action on the nasal mucosa. Pseudoephedrine HCl is recognized as an effective agent for the relief of nasal congestion due to allergic rhinitis.