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Drug Interactions With Fexofenadine and Pseudoephedrine

Erythromycin (Ery-Tab, ERYC, Erythrocin, E.E.S)
Taking erythromycin with fexofenadine and pseudoephedrine may cause your body to metabolize the medicines differently than intended. This can result in an increased amount of fexofenadine and pseudoephedrine in your body. If you are taking these medications together, your healthcare provider may choose to monitor you more closely and make necessary dosing adjustments.
 
Aluminum or Magnesium Antacids (Maalox, Mylanta)
If you are taking fexofenadine and pseudoephedrine with antacids made with aluminum or magnesium, less fexofenadine and pseudoephedrine may be absorbed into your body. When you are taking fexofenadine and pseudoephedrine with antacids, take the antacids at least two hours before or two hours after taking the allergy medicine.
 
Digoxin (Digitek, Lanoxin, Lanoxicap)
If you are taking fexofenadine and pseudoephedrine with digoxin, your body may metabolize the medications differently than intended. Your healthcare provider may choose to monitor your progress more closely.
 
Beta Blockers (Metoprolol [Lopressor], Atenolol [Tenormin], Propranolol [Inderal], Metoprolol Succinate [Toprol XL])
Taking a beta blocker and fexofenadine and pseudoephedrine together may cause your body to metabolize the medicines differently than intended. This can result in the beta blocker not working as well as intended. If you are taking these medications together, your healthcare provider may choose to monitor you more closely and make necessary dosing adjustments.
 
Methyldopa (Aldomet)
Taking methyldopa with fexofenadine and pseudoephedrine may cause your body to metabolize the medicines differently than intended. This can result in methyldopa not working as well as intended. If you are taking these medications together, your healthcare provider may choose to monitor you more closely and make necessary dosing adjustments.
A Dose of Reassurance for Parents of Picky Eaters

Fexofenadine and Pseudoephedrine Medicine

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