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Terbinafine

This article examines the use of terbinafine, an antifungal medication, in various clinical trials. Terbinafine has been studied for treating conditions like onychomycosis (nail fungus), tinea pedis (athlete’s foot), and tinea capitis (scalp ringworm). The trials investigate different formulations, including oral tablets, topical creams, nail lacquers, and film-forming solutions. Researchers aim to assess the drug’s effectiveness, safety, and optimal treatment durations for these fungal infections.

Table of Contents

What is Terbinafine?

Terbinafine is an antifungal medication used to treat various fungal infections. It belongs to a class of drugs called allylamine antifungals. Terbinafine is available under the brand name Lamisil, as well as in generic forms[9][10]. This medication works by stopping the growth of fungi that cause infections.

What Conditions Does Terbinafine Treat?

Terbinafine is used to treat several types of fungal infections, including:

  • Onychomycosis: A fungal infection of the toenails or fingernails, also known as nail fungus[4][5]
  • Tinea pedis: A fungal infection of the feet, commonly known as athlete’s foot[1]
  • Tinea capitis: A fungal infection of the scalp, which primarily affects children[6]

These fungal infections are caused by various types of fungi, including dermatophytes such as Trichophyton, Microsporum, and Epidermophyton species.

How Does Terbinafine Work?

Terbinafine works by interfering with the fungal cell membrane formation. It does this by blocking an enzyme called squalene epoxidase, which is essential for fungal growth. By inhibiting this enzyme, terbinafine prevents the fungi from producing a substance called ergosterol, which is crucial for their cell membranes. This action ultimately leads to the death of the fungal cells, helping to clear the infection[1].

Forms and Dosages of Terbinafine

Terbinafine is available in several forms, including:

  • Oral tablets: Usually 250 mg, taken once daily for a specified period depending on the type and severity of the infection[7][8]
  • Topical creams or solutions: Applied directly to the affected area, typically once or twice daily[2]
  • Nail lacquer: A special formulation designed to be applied directly to infected nails[4][5]

The dosage and duration of treatment can vary depending on the specific condition being treated and the patient’s age and weight. For example, in children with tinea capitis, the dosage is often based on body weight: 25 kg for 125 mg, 25-35 kg for 187.5 mg, and over 35 kg for 250 mg[6].

Effectiveness of Terbinafine

Clinical trials have shown terbinafine to be effective in treating various fungal infections. For example:

  • In onychomycosis (nail fungus), terbinafine has shown effectiveness in achieving complete cure, which is defined as negative microscopy, negative culture for dermatophytes, and no residual involvement of the target toenail[4][5].
  • For tinea pedis (athlete’s foot), studies have evaluated the effectiveness of terbinafine in achieving both mycological cure (negative microscopy and culture) and clinical improvement of symptoms[3].
  • In tinea capitis (scalp fungal infection), terbinafine has been shown to be effective, although some cases of resistance have been reported[6].

Potential Side Effects

Like all medications, terbinafine can cause side effects. Common side effects may include:

  • Gastrointestinal disturbances (e.g., nausea, diarrhea)
  • Headache
  • Skin rashes or itching
  • Changes in taste sensation

More serious side effects are rare but can occur. These may include liver problems or severe skin reactions. It’s important to discuss potential side effects with your healthcare provider and report any unusual symptoms during treatment[2].

Ongoing Research on Terbinafine

Research on terbinafine continues to explore its effectiveness in various formulations and treatment durations. Some areas of ongoing research include:

  • Evaluating the efficacy of single-application terbinafine solutions for tinea pedis[1][3]
  • Investigating the effectiveness of terbinafine nail lacquers for treating onychomycosis with different treatment durations (24 vs 48 weeks)[4][5]
  • Studying the pharmacokinetics (how the drug moves through the body) of different terbinafine formulations[2]
  • Examining potential antifungal resistance in tinea capitis cases[6]

These ongoing studies aim to improve treatment outcomes and find the most effective ways to use terbinafine for various fungal infections.

Aspect Details
Formulations studied Oral tablets, topical creams, nail lacquers, film-forming solutions
Conditions treated Onychomycosis, tinea pedis, tinea capitis
Treatment durations Single application to 48 weeks, depending on condition and formulation
Primary outcomes Complete cure, mycological cure, clinical effectiveness
Safety assessments Adverse events, tolerability, laboratory tests
Study designs Randomized, double-blind, placebo-controlled, multicenter trials
Special populations Adults and children (age-dependent on trial)
Comparators Placebo, vehicle control, active comparators (e.g., other antifungal products)

FAQ

  • What is terbinafine used to treat? Terbinafine is used to treat various fungal infections, including onychomycosis (nail fungus), tinea pedis (athlete's foot), and tinea capitis (scalp ringworm). It works by killing the fungi responsible for these infections.
  • What forms of terbinafine were studied in the clinical trials? The clinical trials studied various forms of terbinafine, including oral tablets, topical creams, nail lacquers, and film-forming solutions. Each formulation was designed to target specific types of fungal infections.
  • How long do terbinafine treatments typically last? Treatment durations varied in the trials. For nail infections (onychomycosis), treatments ranged from 24 to 48 weeks. For skin infections like tinea pedis, shorter durations were studied, including single applications and 7-day treatments.
  • What were the main outcomes measured in these trials? The main outcomes measured included complete cure rates, mycological cure (negative lab tests for fungi), clinical effectiveness, and safety assessments. Researchers looked at the clearance of symptoms, lab results, and any side effects experienced by participants.
  • Were there any placebo comparisons in the terbinafine trials? Yes, many of the trials included placebo or vehicle control groups to compare the effectiveness of terbinafine against a non-active treatment. This helps researchers determine how well the medication works compared to no treatment.

Ongoing Clinical Trials on Terbinafine

  • Study on the Safety and Effectiveness of Terbinafine Solution for Treating Mild to Moderate Nail Fungus in Children Aged 6-17 Years

    Recruiting

    2 1 1 1
    Investigated drugs:
    Denmark Iceland Italy Poland

  • Study on the Safety and Effectiveness of Terbinafine for Patients with Chronic Hepatitis B

    Not recruiting

    2 1 1
    Investigated diseases:
    Investigated drugs:
    The Netherlands

Glossary

  • Onychomycosis: A fungal infection of the nails, commonly known as nail fungus. It can cause the nails to become discolored, thickened, and brittle.
  • Tinea pedis: A fungal infection of the feet, also known as athlete's foot. It causes itching, burning, and cracking of the skin, usually between the toes.
  • Tinea capitis: A fungal infection of the scalp, also called scalp ringworm. It can cause scaly patches, hair loss, and inflammation on the scalp.
  • Mycological cure: The elimination of fungi from an infected area, as confirmed by laboratory tests such as microscopy and culture.
  • KOH microscopy: A laboratory test using potassium hydroxide (KOH) to dissolve skin cells, allowing for the visualization of fungal elements under a microscope.
  • Dermatophytes: A group of fungi that can infect the skin, hair, and nails in humans and animals.
  • Bioequivalence: The property of two drug products having the same rate and extent of absorption when administered at the same dose under similar conditions.
  • Pharmacokinetics: The study of how a drug moves through the body, including its absorption, distribution, metabolism, and excretion.

References

  1. https://clinicaltrials.gov/study/NCT03999437
  2. https://clinicaltrials.gov/study/NCT00691184
  3. https://clinicaltrials.gov/study/NCT01433107
  4. https://clinicaltrials.gov/study/NCT00443820
  5. https://clinicaltrials.gov/study/NCT00443898
  6. https://clinicaltrials.gov/study/NCT06400056
  7. https://clinicaltrials.gov/study/NCT00602251
  8. https://clinicaltrials.gov/study/NCT00602342
  9. https://clinicaltrials.gov/study/NCT01286701
  10. https://clinicaltrials.gov/study/NCT01286688