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And there’s no question that when anxiety is disabling, medication may help. Is there solid evidence that they’re beneficial in the long run?Just what are the safety concerns and potential side effects?Antihistamines are commonly used to treat the symptoms of allergies and reactions to bites and stings.Antihistamines generally come as tablets, creams, ointments and eye drops to reduce conditions such as watering, itchy eyes, running, itchy nose, sneezing, swelling and irritation of the eys, and to reduce hives, nettle rash and other allergic reactions.There may be a risk the medicines could affect each other, which could stop either from working properly or increase the risk of side effects.

There's not much evidence to suggest any particular antihistamine is better than any other at relieving allergy symptoms.Before taking an antihistamine, you should know: The advice varies depending on the exact medicine you're taking.If you're not sure how to take your medicine, ask your pharmacist.Antihistamines work by blocking the action of histamine which the body produces as part of its natural defences.