Antihistamines
The effect of antihistamines can sometimes be altered when they're combined with other substances.
This is known as "interaction" and it's important to try to avoid this whenever possible, as the effects can be unpredictable and potentially dangerous.
Avoid drinking alcohol when taking first-generation antihistamines because this will increasefeelings of drowsiness.
This is the same forother types of medication known to have a sedating effect, such as:
Speak toyour GP or pharmacist before taking a first-generation antihistamine if you're taking any of theabovemedicines.
You shouldn't take a first-generation antihistamine if you're also taking a type of antidepressant known as a monoamine oxidase inhibitor (MAOI). This is because the combination of the two substances can have unpredictable effects.
Most second- and third-generation antihistamines don't interact with other medicines. However, the exceptions to this are:
Many cough and cold medicines available over the counter at pharmacies contain a mixture of different medications, such as paracetamol, decongestants and antihistamines.
Don't take cough and cold medicines if you've recently taken other antihistamine medication because there's a risk of taking an excess dose.
These types of cough and cold medicines aren't recommended for children under six years old because the risks of treatment are thought to outweigh any benefits.
Antihistamines are a type of medicine often used to treat a number of allergic health conditions.
Antihistamines work by stopping histamine affecting your body's cells in the usual way.
Most people are able to take antihistamines. However, antihistamines are not recommended in certain circumstances.
The effect of antihistamines can sometimes be altered when they are combined with other substances.
Like all medicines, antihistamines can have side effects. Generally, these are more significant with first-generation antihistamines.