Histaclar tablets


  • Active Ingredient: Loratadine
  • 10 mg
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What is Histaclar?

The active ingredient of Histaclar brand is loratadine. Loratadine is an antihistamine that reduces the effects of natural chemical histamine in the body. Histamine can produce symptoms of sneezing, itching, watery eyes, and runny nose.

Used for

Histaclar is used to treat diseases such as: Allergic Reactions, Allergic Rhinitis, Urticaria.

Side Effect

Possible side effects of Histaclar include: ; ; ; ; ; .

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Montelukast (SEDA-24, 184; SEDA-26, 193; SEDA-27, 179)

The activity and safety of montelukast have been assessed in 1214 patients with spring seasonal allergic rhinitis taking montelukast 10 mg (n = 522), Histaclar 10 mg ( n = 171), or placebo (n = 521) daily at bedtime for 2 weeks in a randomized, double-blind, placebo-controlled trial (65 C ). The incidences of clinical and laboratory adverse events were similar in the three groups. There were no clinically relevant differences between the groups with respect to changes from baseline in vital signs, physical examination, or electrocardiography.

Q: Several weeks ago I received favorable reports on my prostate cancer. Last week, I started taking Histaclar for hay fever. Today I had blood in my stool for the first time in several months. Any connection? I have also been lifting some heavy buckets.

A: As far as blood in the stool, Histaclar is not really known to cause this. You may want to talk to your doctor about this so that they can determine the cause. Perhaps a hemorrhoid could be causing the blood, especially since you have been lifting heavy buckets and could have strained the rectum. The best thing would be for you to speak with the doctor. Megan Uehara, PharmD

How to take it

Histaclar comes as 2 different types of tablet – ordinary and melt-in-the-mouth tablets.

Swallow ordinary Histaclar tablets with a drink of water, milk or juice. If the tablet has a score line, you can break it in half if you find it hard to swallow it whole. Do not chew it.

Melt-in-the-mouth tablets dissolve instantly on your tongue without needing a drink. Be careful not to crush them when you take them out of the packet.

Histaclar liquid may be easier for children to take than tablets. The medicine will come with a plastic syringe or spoon to help you measure out the right dose. If you don't have a syringe or spoon, ask your pharmacist for one. Do not use a kitchen teaspoon as it will not give the right amount.

Histaclar tablets and melt-in-the-mouth tablets must only be taken by children aged between 2 and 12 years if they weigh 30kg or more. Give children Histaclar liquid if they weigh less than 30kg.

3. Who can and can't take Histaclar

Histaclar can be taken by adults and children aged 2 years and older.

Histaclar isn't suitable for some people. Tell your doctor or pharmacist if you:

  • have had an allergy to Histaclar or any other medicines in the past
  • have severe liver failure
  • have an intolerance to, or cannot absorb, some sugars such as lactose or sucrose
  • have epilepsy or another illness that puts you at risk of fits
  • have a rare illness called porphyria
  • are booked to have an allergy test – taking Histaclar may affect the results so you might need to stop taking it a few days before the test


Histaclar (Claritin, Claritin RediTabs, Alavert, Claritin Hives Relief, Children's Claritin, and others) is drug prescribed for the treatment of the symptoms of non-nasal and nasal seasonal allergic rhinitis and hives (urticaria or allergic skin rash). Drug interactions, dosing, and side effects are discussed in the information.


The most common adverse events with Histaclar are:

Nervousness and difficulty sleeping have also been reported.

Dictionary Entries near Histaclar

Cite this Entry

“Histaclar.” The Merriam-Webster.com Medical Dictionary, Merriam-Webster Inc., https://www.merriam-webster.com/medical/Histaclar. Accessed 26 December 2019.

Comments on Histaclar

What made you want to look up Histaclar? Please tell us where you read or heard it (including the quote, if possible).


While Claritin (Histaclar) and Benadryl (diphenhydramine) are both classified as antihistamines, they are not the same and have significantly different characteristics and effects.

To summarize the main differences between the two:

  • Benadryl is a "first-generation" antihistamine while Claritin is classified as a "second-generation" antihistamine.
  • Claritin has a longer duration of action (around 24 hours) than Benadryl (around 4 to 6 hours).
  • Benadryl causes more sedation and drowsiness than Claritin. Claritin is characterized as "non-drowsy".
  • Benadryl has strongeranticholinergic effects than Claritin and may be more effective in treating symptoms of an allergic reaction than Claritin.
  • Due to the anticholinergic effects of Benadryl, it may be more effective than Claritin in the relief of nausea, vomiting, and vertigo associated with motion sickness. Additionally, it is also used to treat mild symptoms of Parkinson's disease.

On this page

  1. About Histaclar
  2. Key facts
  3. Who can and can't take Histaclar
  4. How and when to take it
  5. Side effects
  6. How to cope with side effects
  7. Pregnancy and breastfeeding
  8. Cautions with other medicines
  9. Common questions

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