Allegra Drug Interactions

Several drugs are known to interact with Allegra. Included in the list of Allegra drug interactions are Nizoral, Erythrocin, and antacids such as Maalox or Mylanta. These interactions may affect the way your body metabolizes Allegra. If you are taking any of these medications together, your healthcare provider may choose to monitor you more closely or make necessary dosing adjustments.

An Introduction to Allegra Drug Interactions

Allegra® (fexofenadine hydrochloride) can potentially interact with a number of other medicines. Some possible Allegra drug interactions include:
 
  • Ketoconazole (Nizoral®)
  • Erythromycin (Ery-Tab®, ERYC®, Erythrocin, E.E.S)
  • Antacids containing aluminum and magnesium, such as Maalox® or Mylanta®
  • Fruit juices. 
     
Ketoconazole (Nizoral)
Taking ketoconazole and Allegra together may cause your body to metabolize the medicines differently than intended. This can result in an increased amount of Allegra in your body. If you are taking these medications together, your healthcare provider may choose to monitor you more closely or make necessary dosing adjustments.
 
Erythromycin (Ery-Tab, ERYC, Erythrocin, E.E.S)
Taking erythromycin and Allegra together may cause your body to metabolize the medicines differently than intended. This can result in an increased amount of Allegra in your body. If you are taking these medications together, your healthcare provider may choose to monitor you more closely or make necessary dosing adjustments.
 
Aluminum or Magnesium Antacids (Maalox, Mylanta)
If you are taking both Allegra and antacids made with aluminum or magnesium, less Allegra may be absorbed into your body. When you are taking Allegra with antacids, take the antacids at least two hours before or two hours after taking the Allegra.
 
Fruit Juices
Taking Allegra with fruit juice can decrease the amount of Allegra absorbed into your body, possibly making it less effective. It is best to take Allegra with water instead.
 
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