Description and Brand Names

Drug information provided by: Merative, Micromedex®

US Brand Name

  1. AHIST
  2. Alavert
  3. Allegra
  4. Aller-Chlor
  5. Aller-G-Time
  6. Antivert
  7. Atarax
  8. Benadryl
  9. Brovex
  10. Childrens Benadryl Allergy Fastmelt
  11. Childrens Pedia Care
  12. Clarinex
  13. Complete Allergy
  14. Compoz Nighttime Sleep Aid
  15. Diphen
  16. Dormin Sleep Aid
  17. Dramamine
  18. Dytan
  19. Dytuss
  20. FusePaq Dicopanol
  21. Histex PD
  22. Hydramine
  23. Lodrane
  24. Nolahist
  25. Optimine
  26. Pediatex 12
  27. Periactin
  28. Polaramine
  29. Q-dryl
  30. Quenalin
  31. Serabrina LA France
  32. Siladryl
  33. Silphen
  34. Simply Allergy
  35. Simply Sleep
  36. Sleep-Ettes D
  37. Sleep Formula
  38. Sleepinal
  39. Sominex
  40. Tavist
  41. Twilite
  42. Unisom
  43. Unisom Sleepgels Maximum Strength
  44. Vistaril
  45. Xyzal
  46. Zymine
  47. ZyrTEC

Canadian Brand Name

  1. Allergy Formula
  2. Allergy Formula Liquid
  3. Basic Care Allergy Relief Caplets
  4. Benadryl Allergy Childrens
  5. Benadryl Childrens
  6. Buckleys Jack Jill Bedtime
  7. Clear Allergy Formula For Adults And Children
  8. Diphedryl Clear
  9. Equate Nighttime Sleep Aid Liquid - Berry Flavour
  10. Exact Allergy Formula Caplets
  11. Exact Nighttime Sleep-Aid - Berry
  12. Gravol


Antihistamines are used to relieve or prevent the symptoms of hay fever and other types of allergy. They work by preventing the effects of a substance called histamine, which is produced by the body. Histamine can cause itching, sneezing, runny nose, and watery eyes. Also, in some persons histamine can close up the bronchial tubes (air passages of the lungs) and make breathing difficult.

Some of the antihistamines are also used to prevent motion sickness, nausea, vomiting, and dizziness. In patients with Parkinson's disease, diphenhydramine may be used to decrease stiffness and tremors. Also, the syrup form of diphenhydramine is used to relieve the cough due to colds or hay fever. In addition, since antihistamines may cause drowsiness as a side effect, some of them may be used to help people go to sleep.

Hydroxyzine is used in the treatment of nervous and emotional conditions to help control anxiety. It can also be used to help control anxiety and produce sleep before surgery.

Some antihistamines are used in the treatment of chronic urticaria, which is a persistent hive-like rash.

Antihistamines may also be used for other conditions as determined by your doctor.

Antihistamine preparations are available both over-the-counter (OTC) and with your doctor's prescription.

Do not give any over-the-counter (OTC) cough and cold medicine to a baby or child under 4 years of age. Using these medicines in very young children might cause serious or possibly life-threatening side effects .

Importance of Diet

Make certain your health care professional knows if you are on a low-sodium, low-sugar, or any other special diet. Most medicines contain more than their active ingredient, and many liquid medicines contain alcohol.

This product is available in the following dosage forms:

  • Solution
  • Tablet
  • Syrup
  • Tablet, Extended Release
  • Suspension, Extended Release
  • Tablet, Chewable
  • Capsule
  • Liquid
  • Tablet, Disintegrating
  • Elixir
  • Suspension
  • Capsule, Liquid Filled
  • Suppository