What does an antihistamine do to your body?

What does an antihistamine do to your body?

What does an antihistamine do to your body?

Antihistamines block the effects of a substance called histamine in your body. Histamine is normally released when your body detects something harmful, such as an infection. It causes blood vessels to expand and the skin to swell, which helps protect the body.

What is the most common side effect of antihistamines?

Common side effects of antihistamines include:

  • Drowsiness or sleepiness.
  • Dizziness.
  • Dry mouth, nose, or throat.
  • Increased appetite and weight gain.
  • Upset stomach.
  • Thickening of mucus.
  • Changes in vision.
  • Feeling nervous, excited, or irritable.

What type of drug is histamine?

Histamine is an ingredient of topical drugs for the relief of joint pain or muscle aches and pains. A depressor amine derived by enzymatic decarboxylation of histidine. It is a powerful stimulant of gastric secretion, a constrictor of bronchial smooth muscle, a vasodilator, and also a centrally acting neurotransmitter.

Is it OK to take antihistamine everyday?

Experts say, it’s usually okay. “Taken in the recommended doses, antihistamines can be taken daily, but patients should make sure they do not interact with their other medications,” says Sandra Lin, MD, professor and vice director of Otolaryngology-Head & Neck Surgery at John Hopkins School of Medicine.

Who should not take antihistamines?

Who shouldn’t take antihistamines?

  • Glaucoma.
  • Trouble urinating (from an enlarged prostate gland)
  • Breathing problems, such as asthma, emphysema, or chronic bronchitis.
  • Thyroid disease.
  • Heart disease.
  • High blood pressure.

What brand name is histamine?

First Generation Antihistamines

Generic name Brand name Duration of action
clemastine Tavist Allergy 12h
diphenhydramine Benadryl 12h
hydroxyzine Atarax, Vistaril 24h
triprolidine Tripohist 12h

What is the best antihistamine?

Best Overall: Allegra Antihistamine Tablets at Amazon.

  • Best Prescription-Strength: Zyrtec Allergy Medicine Tablets at Amazon.
  • Best for Kids: Zyrtec 24 Hr Children’s Allergy Syrup at Amazon.
  • Best Non-Drowsy: Claritin 24-Hour Allergy Reditabs at Amazon.
  • Best Nasal Spray:
  • Best All-Day Relief:
  • Best Eye Drops:
  • Best Natural:
  • Is it better to take antihistamines at night or in the morning?

    For many people with allergies, symptoms are the worst around 4 a.m. to 6 a.m. Taking an antihistamine at bedtime may help you or your child feel better in the morning during allergy season.