Can You Take Benadryl and Xyzal Together Safely?
Benadryl (diphenhydramine) and Xyzal (levocetirizine) are both antihistamines used for allergies, but combining them increases risks of additive side effects like drowsiness, dry mouth, dizziness, and impaired coordination. Medical sources generally advise against routine use together due to these effects, though short-term combination may be tolerated in adults under medical supervision.[1][2]
What Do Doctors and Guidelines Say?
The FDA labels for both drugs warn against combining antihistamines without advice, as they can amplify central nervous system depression. The American Academy of Allergy, Asthma & Immunology notes second-generation antihistamines like Xyzal cause less sedation than first-generation ones like Benadryl, but pairing them still heightens sedation risks. Always consult a doctor or pharmacist first.[1][3]
Common Side Effects When Combined
- Drowsiness: Benadryl crosses the blood-brain barrier easily; Xyzal does less so, but together they intensify sleepiness, affecting driving or machinery use.
- Other effects: Blurred vision, constipation, urinary retention (especially in older adults or those with prostate issues), and confusion.
Elderly patients face higher risks of falls or cognitive impairment.[2][4]
Who Should Avoid This Combination?
Avoid if you:
- Drive or operate heavy equipment.
- Have glaucoma, asthma, or enlarged prostate.
- Are pregnant, breastfeeding, or giving to children under 12 (pediatric doses differ).
- Take sedatives, alcohol, or other CNS depressants, which compound risks.[1][2]
What Are Safer Alternatives?
Stick to one antihistamine: Xyzal alone for 24-hour non-drowsy relief, or Benadryl for acute symptoms. Other options include:
- Nasal steroids like Flonase (less systemic effects).
- Cromolyn sodium for prevention.
- Montelukast (Singulair) for allergies with asthma.
If symptoms persist, allergy testing or immunotherapy may help long-term.[3][5]
When Might a Doctor Recommend It?
Rarely, for severe hives or itching unresponsive to one drug, a doctor might suggest low-dose Benadryl at night with daytime Xyzal. They monitor for interactions and adjust based on your health.[4]
[1]: FDA Label - Xyzal
[2]: FDA Label - Benadryl
[3]: AAAAI Guidelines on Antihistamines
[4]: Drugs.com Interaction Checker
[5]: Mayo Clinic Allergy Treatments