Antihistamines
Block histamine, the substance behind itching, sneezing, a runny nose and hives in allergic reactions.
Why it gets prescribed
Used for allergic rhinitis, hives and allergic itching. Some types cause marked drowsiness, others much less.
What to watch for
Drowsiness affects driving and operating machinery. Older people are more sensitive to the sedating types.
Stopping — read this before you stop anything
Must be stopped before skin prick allergy testing, or the result will be wrong — ask how many days before booking.
Tell the prescriber and the pharmacist
Alcohol and other sedating medicines add up. Mention glaucoma or difficulty passing urine.
Worth asking
- Does mine cause drowsiness
- How many days before allergy testing should I stop
- Is daily use appropriate for me