All A to Z Topics


Antihistamines are a type of medicine often used to treat a number of allergic health conditions.
What antihistamines are used for
Antihistamines are mainly used to help control symptoms caused by health conditions associated with allergic reactions.
How antihistamines work
Antihistamines work by stopping histamine affecting your body's cells in the usual way.
Who can use antihistamines
Most people are able to take antihistamines. However, antihistamines are not recommended in certain circumstances.
Interactions with other medicines
The effect of antihistamines can sometimes be altered when they are combined with other substances.
Side effects of antihistamines
Like all medicines, antihistamines can have side effects. Generally, these are more significant with first-generation antihistamines.