The difference between Allegra and Allegra-D is that Allegra-D combines antihistamine with the nasal decongestant pseudoephedrine. Allegra-D causes no or less drowsiness and works by blocking the release of histamine from the cell at the histamine receptor site and relieving the symptoms of seasonal allergies and hay fever like the itchy, runny nose, sneezing, and watery eyes. Allegra-D's effect begins in an hour and lasts up to twelve hours.
Use caution when using Allegra-D if you have high blood pressure, diabetes, heart disease, prostate problems, or hyperthyroidism as it contains the decongestant pseudoephedrine.
Avoid Allegra-D if you have severe high blood pressure, glaucoma, or kidney disease.
Avoid taking Allegra-D within 2 weeks of using an MAO-inhibitor.
Avoid Allegra-D if you are allergic or sensitive to it.
May cause drowsiness or low concentration. Use caution when driving or operating machinery.
Common side effects of Allegra-D may include drowsiness, agitation, anxiety, headache, fatigue, indigestion, and dry mouth.
Rare side effects of Allegra-D may include nausea, nervousness, cough, stuffy nose, and throat irritation.
Allegra-D should not be used within 2 weeks of using an MAO-inhibitor. Check with your physician before combining it with the following:
Beta-blockers
Mecamylamine
Methyldopa
Reserpine
Avoid Allegra-D if you use a pacemaker and take digoxin.
Combining Allegra-D with alcohol, tranquilizers, or narcotic analgesics may cause excessive drowsiness and low concentration.
Though generally considered safe, do not take Allegra-D without the advice of your physician if you are or planning to become pregnant.
Nursing mothers should switch to bottle-feed while taking Allegra-D as it does pass into breast milk.
Dosages vary for each individual. Consult your physician.
Symptoms of Allegra-D overdose may include drowsiness, dizziness, nausea, nervousness, and dry mouth.
In case of Allegra-D overdose, seek medical help right away.
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