Loratadine chemical structure
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Alavert

Loratadine is a drug used to treat allergies. It is marketed by Schering-Plough under several trade names such as Claritin®, Clarityn® or Claratyne® depending on the market, and by Wyeth as Alavert. It is also available as a generic. Its active metabolite, desloratadine, is also on the market, though loratadine itself is the only drug of its class available over the counter (at least in the US and UK) as of 2005. more...

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It is sometimes combined with pseudoephedrine to add a decongestant aspect to the treatment, making it somewhat useful for colds as well as allergies.

Available forms

Loratadine is available as tablets and oral suspension, and also in combination with pseudoephedrine. Also available are quick-dissolving tablets, which are advertised as being faster to get into one's system but which require special handling to avoid degrading in the package.

Mechanism of action

Loratadine is a tricyclic antihistamine, which has a selective and peripheral H1-antagonist action. It has a long-lasting effect and does not cause drowsiness because it does not readily enter the central nervous system.

Pharmacokinetics

Loratadine is rapidly absorbed from the gastro-intestinal tract and it has rapid first-pass hepatic metabolism. Loratadine is almost totally bound to plasma proteins. Its metabolite, desloratadine (descarboethoxyloratadine), is also active, but binds to plasma proteins only moderately. The half-life of loratadine is on average 8 hours, and its metabolites 28 hours. About 40% is excreted as conjugated metabolites into the urine and similar amount into the feces. Traces of unmetabolised loratadine can be found in the urine.

Recommended dosage

  • Adults and children 15+ years: 10mg once every 24 hours.
  • Children 2-14 years:
    • Bodyweight above 30kg: 10mg once every 24 hours.
    • Bodyweight below 30kg: 5mg once every 24 hours.

(From product packaging for Clarityn tablets.)

Side-effects

Most common side-effects are fatigue, drowsiness, dry mouth, headache, and gastrointestinal disturbances.

Loratadine vs. desloratadine

A November 2003 article published in the journal American Family Physician about the safety, tolerability, effectiveness, price, and simplicity of desloratadine concluded the following:

Desloratadine is similar in effectiveness to fexofenadine and would be expected to produce results similar to loratadine and other nonsedating antihistamines.Thus Desloratidine is of faster onset of action than Loratidine as the Loratidine is activated in the liver into Desloratidine (which was introduced into the american market under the name Aerius by Schering Plough corporation). However, it may be an option for patients whose medical insurance no longer covers loratadine if the co-pay is less than the cost of the over-the-counter product.

External links and references

  • Desloratadine for Allergic Rhinitis, a November 2003 article from American Family Physician
  • Packaging directions in PDF Format. Product Packaging for Claritin 24 hour tablets. URL accessed on January 3, 2005.


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Market impact remains unclear as pending switches head to stores
From Drug Store News, 1/17/05

In the coming year, pharmacists may be making over-the-counter recommendations for two entirely new self-care categories, while the stage may be set for the introduction of a new nonprescription alternative for the diet aid set in 2006.

It was expected in mid-January that a pair of Food and Drug Administration advisory committees would make recommendations on the switch proposal of Johnson & Johnson/ Merck's Mevacor 20 mg.

If the committees recommend not to switch, any chance that statins become an OTC staple one day will be pretty slim. But if those advisory committees vote in favor of an OTC statin, the experts are split on whether this country actually will witness a statin conversion from the prescription market to OTC in the end. Bristol-Myers Squibb and Bayer both believe a statin switch is likely, and the companies are expected to move on their joint switch of Pravachol if the advisory committees vote in favor of Mevacor.

The most compelling arguments against a statin switch are still the safety profile of chronic use and the actual use in an OTC environment of a drug indicated for treating a nonsymptomatic disease state. J&J/Merck ought to be able to justify the safety profile of a low-dose Mevacor, and the company has data from its Zocor HeartPro statin switch in the United Kingdom to draw upon.

Patients in which high cholesterol has been identified as a problem are not the target market for OTC statins--their doctors are prescribing more powerful, higher-dose prescription statins. The market for OTC statins are those consumers who recognize they belong to a high cholesterol risk group, smokers for example, but who are not being treated by a physician for high cholesterol. Therefore, selling statins over-the-counter is likely to happen before the year is over, but it may not generate the dollar windfall many entirely new OTC categories produce when first introduced, judging from Zocor HeartPro's performance. An OTC statin creates a category for which there are no physical symptoms to relieve, so it may be a tough sell for the consumer.

A consumer survey from the National Lipid Association found that more than half of all respondents at moderate risk of high cholesterol expressed strong interest in an OTC statin. However, 83 percent suggested they would talk with their doctors before buying that OTC statin, and if there is a real cholesterol issue there, that doctor is more likely to prescribe a better-performing prescription statin.

This week, the FDA is expected to decide on Barr Laboratories amended switch application of the emergency contraceptive Plan B. The FDA initially rejected Barr's switch application because not enough data was collected in pediatric (read: teen) use. Barr's new application prohibits the sale of Plan B to women younger than 16.

While the issue of making an emergency contraceptive available over-the-counter is politically charged, Plan B is expected to do much better as a nonprescription option. Because the drug must be taken within 48 hours of sexual intercourse to prevent pregnancy, immediate access is an issue.

Later this year, GlaxoSmithKline is expected to file a switch application for orlistat, Roche's prescription weight-loss remedy Xenical. However, a history of adverse side effects, such as gas and oily stools, and new Rx competition could limit Orlistat's OTC potential. Such adverse side effects and the potential launch of Acomplia, a potential blockbuster prescription-only weight loss drug expected to launch in 2006, may restrict the market potential of orlistat as an OTC product.

COPYRIGHT 2005 Reproduced with permission of the copyright holder. Further reproduction or distribution is prohibited without permission.
COPYRIGHT 2005 Gale Group

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