Like all medicines, antihistamines can cause side effects. Side effects of antihistamines that make you drowsy can include: sleepiness (drowsiness) and reduced co-ordination, reaction speed and judgement – do not drive or use machinery after taking these antihistamines.
Why do antihistamines make you tired?
The first-generation antihistamines can make you drowsy because they cross the blood-brain barrier, an intricate system of cells that regulates what substances pass into the brain. In fact, these older antihistamines are often marketed as sleep aids.
What is the most common side effect of antihistamines?
Some of the common side effects of first-generation antihistamines include:
- Dry mouth, dry eyes.
- Blurred or double vision.
- Dizziness and headache.
- Low blood pressure.
- Mucous thickening in the airways.
- Rapid heart rate.
- Difficulty urinating and constipation.
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How long does drowsiness from antihistamines last?
What to do about: feeling sleepy during the daytime – drowsiness usually wears off 4 to 6 hours after a dose.
Which antihistamines are non-drowsy?
Loratadine is known as a non-drowsy antihistamine. It’s less likely to make you feel sleepy than other, so-called, sedating antihistamines such as Piriton (chlorphenamine). Most people prefer to take a non-drowsy antihistamine instead of a sedating one.
Do antihistamines make you gain weight?
Antihistamines may also increase appetite, which can cause weight gain. Anecdotally, people using Xyzal (levocetirizine)—an antihistamine similar to Zyrtec (cetirizine)—they have noticed they have put on extra pounds, which is what a very small percentage of patients who used the drug during trials experienced.
How long do antihistamines take to wear off?
What Antihistamine is Right for you? You can buy many different brands and forms of antihistamines without a prescription. Some work for only 4 to 6 hours, while others last for 12 to 24 hours. Some are combined with a decongestant, a drug that dries up your nasal passages.
When should you not take antihistamines?
increased pressure in the eye. closed angle glaucoma. high blood pressure. stenosing peptic ulcer.
What are the side effects of long term use of antihistamines?
These common side effects include sedation, impaired motor function, dizziness, dry mouth and throat, blurred vision, urinary retention and constipation. Antihistamines can worsen urinary retention and narrow angle glaucoma. The antihistamines rarely cause liver injury.
Why do antihistamines cause weight gain?
Histamine also acts as a neurotransmitter in our brains playing a key role in wakefulness and preventing sleep, which is why Benadryl (an anti-histamine) makes you sleepy. This effect may actually one of the reasons why anti-histamines can result in weight gain.
Do antihistamines weaken immune system?
Most anti-allergy medications do not affect immunity, but it does depend on the medication. Medication such as antihistamines and Montelukast are generally considered safe so you should continue to use these. To the best of our knowledge, there is no reason to think that antihistamines would lower the immune response.
How do you fight antihistamine drowsiness?
To reduce daytime drowsiness, take an antihistamine in the evening rather than in the morning. It may help you sleep, with drowsy effects wearing off by the next day. Be aware, though, that drowsiness can last longer than you might expect – and that some antihistamines can cause vivid or disturbing dreams.
Is it OK to take antihistamines to sleep?
While some over-the-counter antihistamines can cause drowsiness, routinely using them to treat insomnia isn’t recommended. Antihistamines, mainly used to treat symptoms of hay fever or other allergies, can induce drowsiness by working against a chemical produced by the central nervous system (histamine).
Are non drowsy antihistamines as effective?
Non-drowsy antihistamines are generally the best option, as they’re less likely to make you feel sleepy. But types that make you feel sleepy may be better if your symptoms stop you sleeping. Ask a pharmacist for advice if you’re unsure which medicine to try as not all antihistamines are suitable for everyone.
What is the fastest way to reduce histamine?
Controlling histamine levels with diet
- alcohol and other fermented beverages.
- fermented foods and dairy products, such as yogurt and sauerkraut.
- dried fruits.
- processed or smoked meats.
What is the best non drowsy antihistamine for hives?
Your doctor will probably want you to try over-the-counter options like cetirizine (Zyrtec), fexofenadine (Allegra), and loratadine (Claritin) for chronic hives first. They won’t make you sleepy. They usually only cause mild side effects, like dry mouth and eyes.