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Allergies Health Center

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'Tongue Drops' Cut Bee Sting Allergy

Placing Venom Under the Tongue May Offer Alternative to Allergy Shots
WebMD Health News
Reviewed by Louise Chang, MD

March 18, 2008 (Philadelphia) -- Taking allergy drops instead of enduring painful shots may someday become an option for people who are allergic to honeybee stings.

In a preliminary study, Italian researchers found that putting honeybee venom under the tongue was safe and significantly reduced reactions in people allergic to bee stings.

Immunotherapy using the ubiquitous allergy shot is the standard treatment for allergies to everything from insect stings to dust mites. Tiny amounts of the allergens are injected into the patient until tolerance develops.

The new study involved a different form of immunotherapy, called sublingual immunotherapy. It involves putting extracts of allergens under the tongue. Like the shots, sublingual immunotherapy reduces allergic sensitivity in many patients over time.

Although a popular treatment for asthma, rubber latex, and other allergies in many European countries, sublingual therapy has not been approved for use in the U.S.

And it's never been used to treat sting allergies, even in Europe, says researcher Giovanni Passalacqua, MD, of the Allergy and Respiratory Diseases Clinic at the University of Genoa.

Honeybee Venom Drops vs. Placebo

The new study, presented here at the annual meeting of the American Academy of Allergy, Asthma and Immunotherapy (AAAAI), is the first attempt to determine if sublingual immunotherapy is effective against honeybee sting allergies, Passalacqua says.

The study involved 30 people with a history of local allergic reactions to honeybee stings. A local reaction is a large raised patch of pricked skin right in the area of the sting. These raised bumps are often called wheals.

The participants were randomly assigned to receive either sublingual immunotherapy in the form of honeybee venom drops placed under the tongue, or placebo drops.

Patients in the immunotherapy group got escalating doses of honeybee venom for six weeks, followed by a maintenance dose, given three times a week for six months.

"You hold the drop under the tongue for about one or two minutes, then swallow," Passalacqua says.

The Bee Sting Challenge

Then came the bee sting challenge. "We put insects in a jar and then put the jar on the patient's forearm" and looked to see what happened, he says.

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