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Antihistamines

If you are having any symptoms or have any questions, please call 811 to speak with a registered nurse 24 hours a day.

What are antihistamines?

Antihistamines are medicines that help stop allergy symptoms, such as itchy eyes, sneezing and a runny nose. Sometimes, an antihistamine can also help itchy rashes (especially hives).

Why did my healthcare provider give me a prescription when I could buy an over-the-counter antihistimine?

Compared to over-the-counter medicines, prescription antihistamines are less likely to have side effects, such as drowsiness, dry mouth or blurry vision. They are better for older people, children during school hours, and people who work with machinery or drive cars.

Can I take my prescription antihistamine with other medicines?

You shouldn’t take prescription antihistamines if you also are taking certain other prescription drugs, such as erythromycin (an antibiotic), itraconazole or ketoconazole. When your healthcare provider gives you a prescription, always ask if it’s safe to use with the other medicines you’re taking. Your pharmacist can also tell you which medicines you shouldn’t take with a prescription antihistamine. If you aren’t sure, ask the pharmacist or your healthcare provider before taking another medicine.

Can I share my prescription antihistamines with friends who have allergies?

No. You should never share a prescription medicine with another person. Your healthcare provider has examined you and has picked a medicine that is right only for your problem. Some antihistamines can cause serious side effects if they are given to people who are taking another medicine, or who should not take antihistamines for another reason.

Written by familydoctor.org editorial staff.

Revised/Updated: 04-01-2014

Created: 09-01-2000

This handout provides a general overview on this topic and may not apply to everyone. To find out if this handout applies to you and to get more information on this subject, contact your family healthcare provider.

Copyright (c) by the American Academy of Family Physicians

Permission is granted to print and photocopy this material for non-profit educational uses.

Written permission is required for all other uses, including electronic uses.

Nova Scotia Telecare, Reviewed by Clinical Services Working Group, February 2019

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