Doxycycline for children with Lyme disease. Pros and cons.

Tetracyclines, including doxycycline, are typically not recommended for treating young children with lyme disease because the antibiotic may cause permanent staining of the teeth, explains Wormser and colleagues in a recently published article, “Is Doxycycline Appropriate for Routine Treatment of Young Children With Erythema Migrans?” ¹

In the article, Wormser discusses the risk to benefit ratio of prescribing the antibiotic. “Tetracycline-induced dental staining does not spontaneously resolve, may have adverse psychological effects, and families may incur considerable expense to correct the problem.”

This risk is greatest for younger children, he explains. “Because calcification of permanent teeth is largely complete by 5–6 years of age, children who are <4 years of age are at highest risk.”

Doxycycline introduced

However, the risk of dental staining was expected to be less after doxycycline, a tetracycline derivative, was introduced to the market.

“Doxycycline was reported to bind calcium less avidly than does tetracycline, which could explain why doxycycline may be less likely to cause dental staining,” writes Wormser.

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In 2 small studies, which enrolled 89 children, doxycycline did not lead to dental staining. However, the studies were of short duration and used lower doses of the antibiotic than is typically prescribed for tick-borne illnesses.

“These new studies led to the recommendation in 2018 by the Committee on Infectious Diseases of the American Academy of Pediatrics (AAP) that a course of treatment with doxycycline (for up to 21 days) is safe to prescribe for young children with any infection responsive to this agent, specifically including early Lyme disease,” writes Wormser.

Risk to benefit ratio

“The recommendation to use doxycycline in young children with early Lyme disease should be based on assessment of the risk to benefit ratio of use of this drug compared with that of other recommended antibiotics,” writes Wormser.

“The recommendation to use doxycycline in children <8 years of age should require an assessment of how much doxycycline had previously been taken by a patient, including total dosage, because the risk of dental staining is directly related to cumulative exposure,” he adds.

Based on the number of Lyme disease cases reported each year and the percentage of children likely affected, Wormser estimates that “more than 30,000 children <8 years of age could potentially be treated with doxycycline each year.

If the risk of dental staining were even just 1 in 1000 (0.1%),” he explains, “this would translate to >30 children annually who would develop dental staining from taking doxycycline for erythema migrans.

Use of doxycycline clearly is indicated to treat young children with Rocky Mountain Spotted Fever or with other very serious infections for which doxycycline is preferred,” he adds.

Single dose of doxycycline for a tick bite

In addition, the authors discuss treating a deer tick bite with a single dose of doxycycline to prevent Lyme disease. “It seems unlikely that one dose would cause dental staining in young children,” writes Wormser.

However, the authors fail to mention that no studies have demonstrated the effectiveness of a single dose of doxycycline in preventing chronic manifestations of Lyme disease.

Other antibiotics, including amoxicillin, remain an alternative for children with lyme disease who do not have Rocky Mountain Spotted Fever, Ehrlichia or Anaplasmosis.

Editor’s note: I use a risk to benefit ratio approach in my practice when treating Lyme disease.